WorldWideScience

Sample records for air compressors

  1. Efficient Vent Unloading of Air Compressors

    Science.gov (United States)

    Muhonen, Alvin J.

    1987-01-01

    Method for unloading one-and two-stage reciprocating air compressors increases energy efficiency and inhibits deterioration of components. In new unloader configuration, compressor vented to atmosphere on downstream side. Method implemented expeditiously as modification of existing systems.

  2. 30 CFR 57.13010 - Reciprocating-type air compressors.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Reciprocating-type air compressors. 57.13010... Air and Boilers § 57.13010 Reciprocating-type air compressors. (a) Reciprocating-type air compressors... than 25 percent. (b) However, this standard does not apply to reciprocating-type air compressors...

  3. 30 CFR 56.13010 - Reciprocating-type air compressors.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Reciprocating-type air compressors. 56.13010... and Boilers § 56.13010 Reciprocating-type air compressors. (a) Reciprocating-type air compressors... than 25 percent. (b) However, this standard does not apply to reciprocating-type air compressors...

  4. Air Conditioning Compressor Air Leak Detection by Image Processing Techniques for Industrial Applications

    OpenAIRE

    Pookongchai Kritsada; Nakornrat Prasit; Sookananta Bongkoj; Buasri Panhathai

    2015-01-01

    This paper presents method to detect air leakage of an air conditioning compressor using image processing techniques. Quality of air conditioning compressor should not have air leakage. To test an air conditioning compressor leak, air is pumped into a compressor and then submerged into the water tank. If air bubble occurs at surface of the air conditioning compressor, that leakage compressor must be returned for maintenance. In this work a new method to detect leakage and search leakage point...

  5. Sound reduction of air compressors using a systematic approach

    Science.gov (United States)

    Moylan, Justin Tharp

    The noise emitted by portable electric air compressors can often be a nuisance or potentially hazardous to the operator or others nearby. Therefore, reducing the noise of these air compressors is desired. This research focuses on compressors with a reciprocating piston design as this is the most common type of pump design for portable compressors. An experimental setup was developed to measure the sound and vibration of the air compressors, including testing inside a semi-anechoic chamber. The design of a quiet air compressor was performed in four stages: 1) Teardown and benchmarking of air compressors, 2) Identification and isolation of noise sources, 3) Development of individual means to quiet noise sources, 4) Selection and testing of integrated solutions. The systematic approach and results for each of these stages will be discussed. Two redesigned solutions were developed and measured to be approximately 65% quieter than the previous unmodified compressor. An additional analysis was performed on the solutions selected by the participants involved in the selection process. This analysis involved determining which of the design criteria each participant considered most important when selecting solutions. The results from each participant were then compared to their educational background and experience and correlations were identified. The correlations discovered suggest that educational background and experience may be key determinants for the preference models developed.

  6. Air Compressor Driving with Synchronous Motors at Optimal Parameters

    Directory of Open Access Journals (Sweden)

    Iuliu Petrica

    2010-10-01

    Full Text Available In this paper a method of optimal compensation of the reactive load by the synchronous motors, driving the air compressors, used in mining enterprises is presented, taking into account that in this case, the great majority of the equipment (compressors, pumps are generally working a constant load.

  7. Failure analysis of a compressor disc of an air craft

    International Nuclear Information System (INIS)

    Compressor is an essential part of gas turbine engine producing power for both industrial plants and aircrafts. The primary function of the compressor is to supply enough air at high temperature and pressure to satisfy the requirements of the combustion of fuels. The compressor must increase the pressure of the mass of air received from the air inlet duct and then discharge it to the burners in the required quantity and pressure. A secondary function of the compressor, particularly in aircraft application, is to supply bleed air for various purposes for both the engine and aircraft. Compressor blades operate at relatively low temperature but are highly stressed. Compressor balding is made by forging, extrusion or machining. The recommended material for the blades is generally type 403 stainless steel. In a certain report it was reported that compressor disc of an aircraft engine failed after 320 hours service before completing the recommended life of 750 hours. In the present study it was required to find the reason of failure of the disc. Chemical analysis, macro examination, microscopic examinations were carried out along with micro hardness testing on the teeth portion and fractured surface were taken. After the work it was concluded that chemical composition did not match with the recommended composition and also machine marks, porosity were present near the fractured part which increased stress concentration and contributed to failure. Retained austenite were also present at the failed portion which reduces the hardness value and strength causing premature fracture due to fatigue. (author)

  8. Air Conditioning Compressor Air Leak Detection by Image Processing Techniques for Industrial Applications

    Directory of Open Access Journals (Sweden)

    Pookongchai Kritsada

    2015-01-01

    Full Text Available This paper presents method to detect air leakage of an air conditioning compressor using image processing techniques. Quality of air conditioning compressor should not have air leakage. To test an air conditioning compressor leak, air is pumped into a compressor and then submerged into the water tank. If air bubble occurs at surface of the air conditioning compressor, that leakage compressor must be returned for maintenance. In this work a new method to detect leakage and search leakage point with high accuracy, fast, and precise processes was proposed. In a preprocessing procedure to detect the air bubbles, threshold and median filter techniques have been used. Connected component labeling technique is used to detect the air bubbles while blob analysis is searching technique to analyze group of the air bubbles in sequential images. The experiments are tested with proposed algorithm to determine the leakage point of an air conditioning compressor. The location of the leakage point was presented as coordinated point. The results demonstrated that leakage point during process could be accurately detected. The estimation point had error less than 5% compared to the real leakage point.

  9. DESIGN a solar hybrid air conditioning compressor system

    OpenAIRE

    Khalaji Assadi M.; Gilani S. I.; Jun Yen T. C.

    2016-01-01

    To develop and integrate solar hybrid system into conventional air conditioning system which provides the same cooling load with considerably less electricity demand. Solar evacuated tube and DC compressor are used for compressing the refrigerant in an air conditioning system, thus effectively reducing the air conditioning electricity consumption by up to 45%. For the flow through type selected geometry of the designed evacuated U-tube collector, a three dimensional simulation and analysis of...

  10. Operational test procedure for Bldg 241-A-701 air compressor

    International Nuclear Information System (INIS)

    This document is an Operability Test Procedure (OTP) which will verify and record that the 241-A-701 air compressor and associated equipment operates within their intended design parameters. The activities defined in this OTP will be performed to ensure the daily operation of the new compressed air system can be reliable and efficient. The Compressed Air System (CAS) for 241-A-701 supplies process and instrument air to the A, AX, AY, and AZ tank farms. The primary use of the CAS is for tank farms instrumentation, air operated valves, and air lift circulators

  11. High Technology Centrifugal Compressor for Commercial Air Conditioning Systems

    Energy Technology Data Exchange (ETDEWEB)

    Ruckes, John

    2006-04-15

    R&D Dynamics, Bloomfield, CT in partnership with the State of Connecticut has been developing a high technology, oil-free, energy-efficient centrifugal compressor called CENVA for commercial air conditioning systems under a program funded by the US Department of Energy. The CENVA compressor applies the foil bearing technology used in all modern aircraft, civil and military, air conditioning systems. The CENVA compressor will enhance the efficiency of water and air cooled chillers, packaged roof top units, and other air conditioning systems by providing an 18% reduction in energy consumption in the unit capacity range of 25 to 350 tons of refrigeration The technical approach for CENVA involved the design and development of a high-speed, oil-free foil gas bearing-supported two-stage centrifugal compressor, CENVA encompassed the following high technologies, which are not currently utilized in commercial air conditioning systems: Foil gas bearings operating in HFC-134a; Efficient centrifugal impellers and diffusers; High speed motors and drives; and System integration of above technologies. Extensive design, development and testing efforts were carried out. Significant accomplishments achieved under this program are: (1) A total of 26 builds and over 200 tests were successfully completed with successively improved designs; (2) Use of foil gas bearings in refrigerant R134a was successfully proven; (3) A high speed, high power permanent magnet motor was developed; (4) An encoder was used for signal feedback between motor and controller. Due to temperature limitations of the encoder, the compressor could not operate at higher speed and in turn at higher pressure. In order to alleviate this problem a unique sensorless controller was developed; (5) This controller has successfully been tested as stand alone; however, it has not yet been integrated and tested as a system; (6) The compressor successfully operated at water cooled condensing temperatures Due to temperature

  12. Design of Piston Air Compressor Unit Control System based Converter

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    <正>Based on the running characteristics and high energy consumption of air compressors in coal mines,an air pressure PID closed loop control system has been designed in this paper.The system is composed of PLC, converter and sensors etc and adopts the control method of converter triple-evaporator which makes air supply"need-based".The designed system has been applied in multiple coal mines and the results show its energy saving is remarkable and potential application is widely.

  13. DESIGN a solar hybrid air conditioning compressor system

    Directory of Open Access Journals (Sweden)

    Khalaji Assadi M.

    2016-01-01

    Full Text Available To develop and integrate solar hybrid system into conventional air conditioning system which provides the same cooling load with considerably less electricity demand. Solar evacuated tube and DC compressor are used for compressing the refrigerant in an air conditioning system, thus effectively reducing the air conditioning electricity consumption by up to 45%. For the flow through type selected geometry of the designed evacuated U-tube collector, a three dimensional simulation and analysis of the thermal performance was done, using the solar ray-tracing model provided by the ANSYS-FLUENT software.

  14. Numerical Simulation and Performance Analysis of Twin Screw Air Compressors

    Directory of Open Access Journals (Sweden)

    W. S. Lee

    2001-01-01

    Full Text Available A theoretical model is proposed in this paper in order to study the performance of oil-less and oil-injected twin screw air compressors. Based on this model, a computer simulation program is developed and the effects of different design parameters including rotor profile, geometric clearance, oil-injected angle, oil temperature, oil flow rate, built-in volume ratio and other operation conditions on the performance of twin screw air compressors are investigated. The simulation program gives us output variables such as specific power, compression ratio, compression efficiency, volumetric efficiency, and discharge temperature. Some of the above results are then compared with experimentally measured data and good agreement is found between the simulation results and the measured data.

  15. Development and Testing of Supercharger Compressor for Cold Climate Air Source Heat Pumps

    OpenAIRE

    Walter, Thomas; Jonas, Travis

    2014-01-01

    The on-going development of a compact centrifugal compressor as a first stage or pre-compressor for cold climate operation of heat pumps is described. Positioned in the low pressure vapor portion of the refrigerant loop, this compressor will, on cold days, operate automatically to boost refrigerant pressure, in a manner similar to the way an automotive supercharger pressurizes air. The single stage motor driven centrifugal compressor runs on oil-free bearings. It is being configured to work i...

  16. Impact of the electric compressor for automotive air conditioning system on fuel consumption and performance analysis

    Science.gov (United States)

    Zulkifli, A. A.; Dahlan, A. A.; Zulkifli, A. H.; Nasution, H.; Aziz, A. A.; Perang, M. R. M.; Jamil, H. M.; Misseri, M. N.

    2015-12-01

    Air conditioning system is the biggest auxiliary load in a vehicle where the compressor consumed the largest. Problem with conventional compressor is the cooling capacity cannot be control directly to fulfill the demand of thermal load inside vehicle cabin. This study is conducted experimentally to analyze the difference of fuel usage and air conditioning performance between conventional compressor and electric compressor of the air conditioning system in automobile. The electric compressor is powered by the car battery in non-electric vehicle which the alternator will recharge the battery. The car is setup on a roller dynamometer and the vehicle speed is varied at 0, 30, 60, 90 and 110 km/h at cabin temperature of 25°C and internal heat load of 100 and 400 Watt. The results shows electric compressor has better fuel consumption and coefficient of performance compared to the conventional compressor.

  17. An Investigation of Refrigerant Oil Retention in an Air Conditioning System with Two Inverter Compressors in Parallel

    OpenAIRE

    Kuo, Cheng-Shu; Cheng, Wei-Yueh; Hsieh, Wen-Der; Liu, Yangguang

    2012-01-01

    A VRF (variable refrigerant flow) air conditioning, having a number of air handling units connected to an external condensing unit, commonly uses two or more compressors in the system. The complicated piping system of the VRF air conditioning causes difficulties for refrigerant oils to return back to each compressor, especially for compressors operating in different frequencies. Compressors need lubrication in operation process, otherwise the compressor will burn out because of wearing and ov...

  18. 241-U-701 new compressor building and instrument air piping analyses

    International Nuclear Information System (INIS)

    Building anchorage analysis is performed to qualify the design of the new compressor building foundation given in the ECN ''241-U-701 New Compressor Building.'' Recommendations for some changes in the ECN are made accordingly. Calculations show that the 6-in.-slab is capable of supporting the pipe supports, and that the building foundation, air compressor and dryer anchorage, and electric rack are adequate structurally. Analysis also shows that the instrument air piping and pipe supports for the compressed air system meet the applicable code requirements and are acceptable. The building is for the U-Farm instrument air systems

  19. Evaluation of a natural gas compressor building with switch-back air inlet entrances and ventilated by compressor package coolers

    Energy Technology Data Exchange (ETDEWEB)

    Simmons, Timothy G. [HFP Acoustical Consultants Inc. (United States)], email: tim.simmons@hfpacoustical.com

    2011-07-01

    The booming natural gas market in the Marcellus shale region has seen the appearance of many oil and gas processing stations, the latter generating a great deal of noise, which disturbs local residents. The oil and gas companies have therefore developed a patchwork of noise reduction techniques, from basic mufflers to engineered, sound-proof buildings. This paper focuses on a compromise: a gas compressor station, located in Lycoming County, Pennsylvania, encased in a light-weight, metal building with switch-back air inlet openings for cooling and noise reduction. This case study aims to measure the noise emissions of the compressor, and possibly propose solutions for its mitigation. Since Lycoming County has a fairly stringent policy on noise disturbance, especially for low-frequency sounds, noise emission results showed that switch-back openings and the walls of the compressor building must be mitigated and that action must be taken by the gas company to meet the noise ordinance requirements.

  20. DEVELOPMENT OF A LINEAR COMPRESSOR FOR AIR CONDITIONERS AND HEAT PUMPS

    Science.gov (United States)

    The report discusses the design, building, testing, and delivering to the Environmental Protection Agency of a linear compressor for operation in a 3.0- ton (10.5 kW) residential air-conditioning and heat pumping system. The compressor design evolved from a linear resonant piston...

  1. hermetically sealed compressor unit, temperature level, mathematical model, marine air conditioning syste

    OpenAIRE

    Lytosh, Olena V.; Dorosh, Vadym S.

    2014-01-01

    The mathematical model and calculation method of the temperature level of the hermetically sealed compressor unit for the marine self-contained air conditioners taking into account the operating conditions and machine design parameters have been given.

  2. New Energy-Efficient Electromagnetic Clutch for Automotive Air Conditioning Compressors

    OpenAIRE

    Baumgart, Rico; van der Seylberg, Frank; Aurich, Joerg; von Unwerth, Thomas

    2012-01-01

    Even if the air conditioning is switched off, the internal combustion engine in today’s cars continues to drive the common compressor. To avoid resulting power losses, the automotive industry aspires to apply electromagnetic clutches. When the air conditioning is used, however, CO2-emission increases significantly because the electromag-netic coil consumes electricity. The CO2-reduction per year is consequently very low, which is why new compressor clutches were developed that do not require ...

  3. Study of noise transmission from an air compressor

    Science.gov (United States)

    Nathak, Subhro; Puranik, Anand; Schut, Jeffrey; Wells, Lee; Rao, M. D.

    2005-09-01

    The paper discusses the reduction of noise from a Porter Cable 4-gal, 135-psi air compressor. The objectives were to identify the major sources of noise, implement possible noise control measures, and evaluate their effectiveness. Sound measurements were taken according to a procedure that was developed and based on the standards for power tools. Broadband analysis (1/12 octave band) was done to determine the main sources of noise. Ranking of noise sources was done accordingly. The major source of noise was determined to be the piston cylinder assembly and efforts were taken to reduce this main source of noise. The noise control treatments included manufacturing of new parts, use of gasket made of cork between the housing and the cylinder sleeve to isolate the vibrations, implementing a silencer at the exhaust side of the piston and finally, an enclosure encircling the piston/cylinder assembly. The sound-pressure level measurements of the prototype were compared to the baseline measurements to test the effectiveness of the treatments. The overall sound pressure level was reduced from 101.5 to 94.3 dB with the implementation of enclosure around the piston/cylinder assembly and the silencer at the exhaust side of the piston.

  4. Compressor-fan unitary structure for air conditioning system

    Science.gov (United States)

    Dreiman, N.

    2015-08-01

    An extremely compact, therefore space saving unitary structure of short axial length is produced by radial integration of a revolving piston rotary compressor and an impeller of a centrifugal fan. The unitary structure employs single motor to run as the compressor so the airflow fan and eliminates duality of motors, related power supply and control elements. Novel revolving piston rotary compressor which provides possibility for such integration comprises the following: a suction gas delivery system which provides cooling of the motor and supplies refrigerant into the suction chamber under higher pressure (supercharged); a modified discharge system and lubricating oil supply system. Axial passages formed in the stationary crankshaft are used to supply discharge gas to a condenser, to return vaporized cooling agent from the evaporator to the suction cavity of the compressor, to pass a lubricant and to accommodate wiring supplying power to the unitary structure driver -external rotor electric motor.

  5. Performance Evaluation of an Air-Conditioning Compressor Part I: Measurement and Design Modeling

    OpenAIRE

    Thomas W. Bein; Yu-Tai Lee

    1999-01-01

    In order to comply with legislation to eliminate the use of refrigerants that damage the ozone layer, it is necessary to redesign centrifugal compressors, used by the US Navy for shipboard air-conditioning systems, to use an environmentally acceptable refrigerant. This paper describes an evaluation of a 125-ton compressor designed to use HCFC-124 as the refrigerant. The objectives are not only conducting the performance evaluation, but also pinpointing the design problems for achieving a high...

  6. R32 Compressor for Air conditioning and Refrigeration applications in China

    OpenAIRE

    Guo, Weihua; Ji, GaoFeng; Zhan, Honghong; Wang, Dan

    2012-01-01

    This paper evaluates the compressor performance and reliability impact by using R32 refrigerant for air conditioning (residential and commercial system); Performance and reliability impacts are compared with different popular refrigerants used in China, for example, R410A & R22 for AC. The design improvement on the scroll compressor will be discussed in order to reach required efficiency and reliability; these improvements include lubrication, internal heat management, motor design, and vapor...

  7. Performance Evaluation of an Air-Conditioning Compressor Part II: Volute Flow Predictions

    OpenAIRE

    Yu-Tai Lee; Thomas W. Bein

    1999-01-01

    A numerical method that solves the Reynolds-averaged Navier-Stokes equations is used to study an inefficient component of a shipboard air-conditioning HCFC-124 compressor system. This high-loss component of the centrifugal compressor was identified as the volute through a series of measurements given in Part I of the paper. The predictions were made using three grid topologies. The first grid closes the connection between the cutwater and the discharge diffuser. The other two grids connect th...

  8. Effect of double air injection on performance characteristics of centrifugal compressor

    Science.gov (United States)

    Hirano, Toshiyuki; Takano, Mizuki; Tsujita, Hoshio

    2015-02-01

    In the operation of a centrifugal compressor of turbocharger, instability phenomena such as rotating stall and surge are induced at a lower flow rate close to the maximum pressure ratio. In this study, for the suppression of surge phenomenon resulting in the extension of the stable operating range of centrifugal compressor to lower flow rate, the compressed air at the compressor exit was re-circulated and injected into the impeller inlet by using the double injection nozzle system. The experiments were performed to find out the optimum circumferential position of the second nozzle relative to the fixed first one and the optimum inner diameter of the injection nozzles, which are able to most effectively reduce the flow rate of surge inception. Moreover, in order to examine the universality of these optimum values, the experiments were carried out for two types of compressors.

  9. Development of a dynamic centrifugal compressor selector for large compressed air networks in the mining industry / Johan Venter.

    OpenAIRE

    Venter, Johan

    2012-01-01

    Various commercial software packages are available for simulating compressed air network operations. However, none of these software packages are able to dynamically prioritise compressor selection on large compressed air networks in the mining industry. In this dissertation, a dynamic compressor selector (DCS) will be developed that will actively and continuously monitor system demand. The software will ensure that the most suitable compressors, based on efficiency and posi...

  10. Study on Variable Capacity Control Mechanism of Scroll Compressor for Automotive Air Conditioner

    Science.gov (United States)

    Hirano, Takahisa; Shigeoka, Tetsuo

    As for the automotive air conditioner, (1) to keep the automotive cabin temperature in a comfortable region, (2) to improve driving feeling, (3) to drive the air conditioning system economically through all seasons, are universally required. Recently, from these points, compressors with variable capacity control mechanism for automotive air conditioners have been remarkably requested. We have developed a scroll comoressor with variable capacity control mechanism. The capacity control mechanism, which changes the channel area of the bypass hole continuously, according to the suction gas pressure and the discharge gas pressure, has been developed. In this report, we describe the mechanism of variable capacity control and the performance simulation program that has been developed for the scroll compressor. Further, we describe the measuring results of cylinder pressure behavior, the results of energy loss analysis and the effect of comfort, drivability, power saving in the refrigerating cycle using the developed capacity control compressor.

  11. Integration of MACBETH and COPRAS methods to select air compressor for a textile company

    Directory of Open Access Journals (Sweden)

    Nilsen Kundakcı

    2016-09-01

    Full Text Available The selection of air compressor is a Multiple Criteria Decision Making (MCDM problem including conflicting criteria and various alternatives. Selecting the appropriate air compressor is an important decision for the company as it affects the energy consumption and operating cost. To aid the decision making process in the companies, MCDM methods are proposed in the literature. In all MCDM methods, the main goal is to select the best alternative or to rank a set of given alternatives. In this paper, the air compressor is selected for a spinning mill of a textile company with an integrated approach based on MACBETH (Measuring Attractiveness by a Categorical Based Evaluation TecHnique and COPRAS (COmplex PRoportional ASsessment methods. MACBETH method is utilized to determine the weights of the criteria. Then COPRAS method is used to determine the ranking of the alternatives and select the best one.

  12. Interaction of temperature, humidity, driver preferences, and refrigerant type on air conditioning compressor usage.

    Science.gov (United States)

    Levine, C; Younglove, T; Barth, M

    2000-10-01

    Recent studies have shown large increases in vehicle emissions when the air conditioner (AC) compressor is engaged. Factors that affect the compressor-on percentage can have a significant impact on vehicle emissions and can also lead to prediction errors in current emissions models if not accounted for properly. During 1996 and 1997, the University of California, Riverside, College of Engineering-Center for Environmental Research and Technology (CE-CERT) conducted a vehicle activity study for the California Air Resources Board (CARB) in the Sacramento, CA, region. The vehicles were randomly selected from all registered vehicles in the region. As part of this study, ten vehicles were instrumented to collect AC compressor on/off data on a second-by-second basis in the summer of 1997. Temperature and humidity data were obtained and averaged on an hourly basis. The ten drivers were asked to complete a short survey about AC operational preferences. This paper examines the effects of temperature, humidity, refrigerant type, and driver preferences on air conditioning compressor activity. Overall, AC was in use in 69.1% of the trips monitored. The compressor was on an average of 64% of the time during the trips. The personal preference settings had a significant effect on the AC compressor-on percentage but did not interact with temperature. The refrigerant types, however, exhibited a differential response across temperature, which may necessitate separate modeling of the R12 refrigerant-equipped vehicles from the R134A-equipped vehicles. It should be noted that some older vehicles do get retrofitted with new compressors that use R134A; however, none of the vehicles in this study had been retrofitted. PMID:11288304

  13. Development of High Speed Inverter Rotary Compressor for the Air-conditioning System

    Science.gov (United States)

    Kang, Seoung-Min; Yang, Eun-soo; Shin, Jin-Ung; Park, Joon-Hong; Lee, Se-Dong; Ha, Jong-Hun; Son, Young-Boo; Lee, Byeong-Chul

    2015-08-01

    In order to meet the various operating loads of an air-conditioning system, an inverter compressor with a wide operational range is necessary. One of the ways to achieve a wide operation range is to drive a small capacity compressor at high speed. Moreover, it is possible to maximize the efficiency in part-load operation condition close to actual operating conditions and to reduce the cost by compact design of a small capacity compressor. In addition, the shortage of maximum capacity, due to the small rated capacity, is covered through high speed operation. However, in general, if the compressor operates at high speed, problems occurs such as reduced efficiency due to friction, increased noise, increased amount of oil discharge and decreased durability of the main components. In order to solve these problems the following have been investigated: optimized dimension parameters of the compression chamber, enhanced shaft design and the structure for the reduction of oil discharge and noise at high speed operation. Finally the high speed inverter rotary compressor with high efficiency and more compact size has been developed as compared with the conventional rotary compressor.

  14. Contribution to the modeling and control of the compressors. Apply to the management of the Fuel Cells air sypply systems

    OpenAIRE

    M'Boua, Jérémie

    2010-01-01

    The fuel cell is presented as one of the reliable sources in the futur energy mix. However some improvements have to be done before a large market introduction on many aspects, including the subsystems such as the air compressor providing air to the fuel cell. The air compressor consumes nearly 20% of the fuel cell system energy's. Better control of the system compressor will increase energy efficiency. The work presented in this thesis deals with the modeling and the simulation of a air comp...

  15. Model analysis and nonlinear control of air compressors

    Science.gov (United States)

    Sari, Gholam-Reza

    For decades, gas turbines have been important, widespread, and reliable devices in the field of power generation, petrochemical industry, and aeronautics. They employ centrifugal and axial compressors which suffer from aerodynamic instabilities, namely, surge and rotating stall. These performance limiting instabilities can cause component stress, lifespan reduction, noise, and vibration. Furthermore, in variable speed axial compressors (VSACs), speed variations affect the system stability and can lead to surge and rotating stall. This limits the rate of speed variations and results in important performance penalties. The present work firstly addresses the bifurcation analysis of VSACs' model to investigate the impact of speed dynamics on the stability of efficient operating points. Here, the rate of speed variations (acceleration rate) is defined as a new parameter of the model and a detailed numerical bifurcation analysis is provided. The results of time-domain simulations not only validate the results of bifurcation analysis, but also broaden our knowledge about the transient response of the model, which is a matter of importance as well. The analysis reveals that speed variations can lead to a fully developed rotating stall as well as the previously reported temporary stall developments. The results show that the developed instabilities depend to a great extent on the acceleration rate. The impact of other key issues such as throttle gain, viscosity factor, initial speed, final speed, and the contribution of stall modes are also explored. From the control point of view, despite reported achievements, robust control design for compression systems remains a challenging problem. In this work, at first, two nonlinear approaches are proposed to tackle the stability problem of constant-speed axial compressors (CSACs). The first approach is a robust passivity-based control and the second one is a second order sliding mode control. The approaches tackle the challenging

  16. Technical Requirements and Principles for the Standards Development of the Key Parts for Rotor Air-conditioning Compressors

    Institute of Scientific and Technical Information of China (English)

    Sun Min; Wen Yun; Fan Zhangzeng

    2011-01-01

    ntroductionSince 2000,air-conditioning sales continues to grow,and the development of air-conditioning market makes a booming market of compressor.At the present time,compressor production rising all the way,and the sales steps up the new steps constantly.Tendency chart is shown in figure 1.Rotor compressor with its simple structure,small volume,light weight,easy processed mechanical parts,reliable operation and other excellent characteristics occupied the dominant position in the market.Compared with reciprocating compressor on the same application situation,decreased in the size by 40%~50%,weight was reduced by 40%~50%.But there were also disadvantages,mainly large friction loss,friction power consumption was about 10%of compressor's total power input.

  17. Comparison and Evaluation of a New Innovative Drive Concept for the Air Conditioning Compressor of Electric Vehicles

    OpenAIRE

    Aurich, Joerg; Baumgart, Rico; Danzer, Christoph; Ackermann, Jan

    2014-01-01

    The development of an energy efficient air conditioning system for electric vehicles is an ever increasing challenge, because the cooling as well as the heating of the passenger cell reduces the cruising range dramatically. Almost always the compressor of the air conditioning system in electric cars is a scroll compressor with a separate electric motor and appropriate power electronics. However, this solution is critical in terms of the installation space, the weight and also the costs. There...

  18. A dangerous joke: Colon perforation by an air compressor

    OpenAIRE

    HAZAR, Erkan; Kayipmaz, Afsin Emre; Coskun, Abuzer; Ozbay, Sedat; Okur, Osman Mahir; Ozkan, Ilham; Eren, Sevki Hakan; Kavalci, Cemil

    2015-01-01

    The most dangerous complication of air entry into rectum at a high volume and velocity in a short time are sigmoid colon rupture and pneumoperitoneum.We present a 28-year-old male was brought to emergency with abdominal nausea, vomiting, pain, and abdominal swelling for 4 hours. Based on physical examination and laboratory data the patient was taken to operating theatre for suspected acute appendicitis. On exploration an excessive amount of gas distention was observed in whole colon with caec...

  19. Experiments of effects of inlet-air distortion on aerodynamic performance in transonic compressor

    Institute of Scientific and Technical Information of China (English)

    LI Mao-yi; YUAN Wei; LU Ya-jun; SONG Xi-zhen; LU Li-peng

    2013-01-01

    The inlet-air distortion which was caused by high angle-of-attack flight was simulated by plugboard.Experiments were conducted on a transonic axial-flow compressor's rotor at 98% rotating speed.The flow field characteristics and mechanism of performance degradation were analyzed in detail.The compressor inlet was divided into four sectors at circumference under inlet-air distortion.They were undistorted sector,transition sector A where the rotor was rotating into the distortion sector,distorted sector and transition sector B where the rotor was rotating out of the distortion sector.The experimental results show that compared with undistorted sector,there is a subsonic flow in transition sector A,so the pressure ratio is decreased by a large margin in this sector.However,the shock wave is enhanced in distortion sector and transition sector B,and thus the pressure ratio increases in these sectors.Because of the different works at circumference,the phase angle of total pressure changes 90° when the inlet total pressure distortion passes through compressor rotor.In addition,the frequency and amplitude of disturbances in front of the rotor strengthenes under inlet distortion,so the unstable flow would take place in advance.In addition,the position of stall inception is in one of the transition sectors.

  20. DISPLACEMENT CONTROL AND KINETIC ANALYSIS OF A NOVEL VARIABLE DISPLACEMENT COMPRESSOR FOR AUTOMOTIVE AIR CONDITIONER

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    A novel variable displacement compressor (VDC) for automotive air conditioner (AAC) is introduced, which inherits the advantages of common wobble plate type VDC. It has fewer parts and makes less noise, and inst ead of pneumatic valve the displacement is controlled by electronic control valv e. In order to know the control mechanism well and get a good control effect, a mathematical model for the variable displacement mechanism is developed accordin g to the geometrical and kinematical information of the compressor. Using the mo del, the effect of relevant parameters on variable displace control is estimated . It is helpful to make the optimum decision in the flow control of AAC. As the novel displacement control device, the structure and control rule of electronic control valve is introduced. It can get better effect than the conventional pneu matic valves. And by using this new electronic control device, the optimum syste mic control of AAC is available.

  1. Air compressor battery duration with mechanical ventilation in a field anesthesia machine.

    Science.gov (United States)

    Szpisjak, Dale F; Giberman, Anthony A

    2015-05-01

    Compressed air to power field anesthesia machine ventilators may be supplied by air compressor with battery backup. This study determined the battery duration when the compPAC ventilator's air compressor was powered by NiCd battery to ventilate the Vent Aid Training Test Lung modeling high (HC = 0.100 L/cm H2O) and low (LC = 0.020 L/cm H2O) pulmonary compliance. Target tidal volumes (VT) were 500, 750, and 1,000 mL. Respiratory rate = 10 bpm, inspiratory-to-expiratory time ratio = 1:2, and fresh gas flow = 1 L/min air. N = 5 in each group. Control limits were determined from the first 150 minutes of battery power for each run and lower control limit = mean VT - 3SD. Battery depletion occurred when VT was below the lower control limit. Battery duration ranged from 185.8 (±3.2) minutes in the LC-1000 group to 233.3 (±3.6) minutes in the HC-750 group. Battery duration of the LC-1000 group was less than all others (p = 0.027). The differences among the non-LC-1000 groups were not clinically significant. PMID:25939102

  2. Operational test report for the 241-A-701 air compressor upgrade

    International Nuclear Information System (INIS)

    A description and safety class designation of the accumulator and 701-A compressor system is contained in VTHC-SD-at sign-DA-137, Safety Classification (of the 241-A-70) Compressed Air System and shown on drawings H-2-62895, Sheet 2 and H-14-20308, Sheet 3. The design basis for the 241-A-702 Ventilation System Accumulator is contained in at sign-C-SD-at sign-DB-016, 241-A-702 Ventilation System Accumulator Design Basis

  3. Girth welding system for vortex type refrigeration compressor of air conditioner

    Institute of Scientific and Technical Information of China (English)

    Liu Xiaowen; Ma Caixia; Yang Siqian; Hu Jisheng

    2006-01-01

    According to the requirements of welding process for vortex type compressor of air conditioner manufactured in product line, a special girth welding machine with PLC as control core was developed, which had both upright and 45 ° incline service positions. And some key technologies were researched, such as structural design of machine body, reliable conduction of rotary weldments and quality control of welding process and so on. The experimental results showed that this machine could satisfy the requirements of welding quality and girth welding technology, results also proved the machine was a high-efficiency and low-cost automatic welding device.

  4. Japanese and American competition in the development of scroll compressors and its impact on the American air conditioning industry

    Energy Technology Data Exchange (ETDEWEB)

    Ushimaru, Kenji (Energy International, Inc., Bellevue, WA (USA))

    1990-02-01

    This report examines the technological development of scroll compressors and its impact on the air conditioning equipment industry. Scroll compressors, although considered to be the compressors of the future for energy-efficient residential heat pumps and possibly for many other applications, are difficult to manufacture on a volume-production base. The manufacturing process requires computer-aided, numerically controlled tools for high-precision fabrication of major parts. Japan implemented a global strategy for dominating the technological world market in the 1970s, and scroll compressor technology benefited from the advent of new-generation machine tools. As a result, if American manufacturers of scroll compressors purchase or are essentially forced to purchase numerically controlled tools from Japan in the future, they will then become dependent on their own competitors because the same Japanese conglomerates that make numerically controlled tools also make scroll compressors. This study illustrates the importance of the basic machine tool industry to the health of the US economy. Without a strong machine tool industry, it is difficult for American manufacturers to put innovations, whether patented or not, into production. As we experience transformation in the air conditioning and refrigeration market, it will be critical to establish a consistent national policy to provide healthy competition among producers, to promote innovation within the industry, to enhance assimilation of new technology, and to eliminate practices that are incompatible with these goals. 72 refs., 8 figs., 1 tab.

  5. Mid-section of a can-annular gas turbine engine with a radial air flow discharged from the compressor section

    Energy Technology Data Exchange (ETDEWEB)

    Little, David A.; McQuiggan, Gerard; Wasdell, David L.

    2016-10-25

    A midframe portion (213) of a gas turbine engine (210) is presented, and includes a compressor section (212) configured to discharge an air flow (211) directed in a radial direction from an outlet of the compressor section (212). Additionally, the midframe portion (213) includes a manifold (214) to directly couple the air flow (211) from the compressor section (212) outlet to an inlet of a respective combustor head (218) of the midframe portion (213).

  6. Effect of Refrigerant Charge, Compressor Speed and Air Flow Through the Evaporator on the Performance of an Automotive Air Conditioning System

    OpenAIRE

    Datta, Santanu Prasad; Das, Prasanta Kumar; Mukhopadhyay, Siddhartha

    2014-01-01

    During last few decades research on Automotive Air Conditioning System (AACS) reached a milestone in terms of comfort, safety and economy. However investigation on system performance due to AACS’s variable operating conditions is limited. The performance of any AACS mostly depends on compressor speed, blower speed, refrigerant charge level and ambient condition. However, the combined effect of these parameters on the performance of AACS could be non-intuitive. Reduction in compressor speed an...

  7. The Mechanism of Stall Margin Improvement in a Centrifugal Compressor with the Air Bleeding Circumferential Grooves Casing Treatment

    Science.gov (United States)

    Gao, P.; Chu, W. L.; Wu, Y. H.

    The air bleeding circumferential grooves casing treatment has the potential to extent the operating range of centrifugal compressor with no loss in efficiency. A time accurate 3-dimentional numerical simulation was performed in a low speed centrifugal compressor with the air bleeding circumferential grooves casing treatment. The numerical results agreed well with experimental test data for the global performance. Detailed analyses of the flow visualization at the tip of blades have exposed the different tip flow topologies between the cases with casing treatment and with untreated smooth wall, and the reasons how the second flow vortex is retrained. The mechanism of stall margin improvement is gained finally.

  8. Performance of R-410A Alternative Refrigerants in a Reciprocating Compressor Designed for Air Conditioning Applications

    Energy Technology Data Exchange (ETDEWEB)

    Shrestha, Som S [ORNL; Vineyard, Edward Allan [ORNL; Mumpower, Kevin [Bristol Compressors International, Inc.

    2016-01-01

    In response to environmental concerns raised by the use of refrigerants with high Global Warming Potential (GWP), the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) has launched an industry-wide cooperative research program, referred to as the Low-GWP Alternative Refrigerants Evaluation Program (AREP), to identify and evaluate promising alternative refrigerants for major product categories. After successfully completing the first phase of the program in December 2013, AHRI launched a second phase of the Low-GWP AREP in 2014 to continue research in areas that were not previously addressed, including refrigerants in high ambient conditions, refrigerants in applications not tested in the first phase, and new refrigerants identified since testing for the program began. Although the Ozone Depletion Potential of R-410A is zero, this refrigerant is under scrutiny due to its high GWP. Several candidate alternative refrigerants have already demonstrated low global warming potential. Performance of these low-GWP alternative refrigerants is being evaluated for Air conditioning and heat pump applications to ensure acceptable system capacity and efficiency. This paper reports the results of a series of compressor calorimeter tests conducted for the second phase of the AREP to evaluate the performance of R-410A alternative refrigerants in a reciprocating compressor designed for air conditioning systems. It compares performance of alternative refrigerants ARM-71A, L41-1, DR-5A, D2Y-60, and R-32 to that of R-410A over a wide range of operating conditions. The tests showed that, in general, cooling capacities were slightly lower (except for the R-32), but energy efficiency ratios (EER) of the alternative refrigerants were comparable to that of R-410A.

  9. Performance and economic enhancement of cogeneration gas turbines through compressor inlet air cooling

    Science.gov (United States)

    Delucia, M.; Bronconi, R.; Carnevale, E.

    1994-04-01

    Gas turbine air cooling systems serve to raise performance to peak power levels during the hot months when high atmospheric temperatures cause reductions in net power output. This work describes the technical and economic advantages of providing a compressor inlet air cooling system to increase the gas turbine's power rating and reduce its heat rate. The pros and cons of state-of-the-art cooling technologies, i.e., absorption and compression refrigeration, with and without thermal energy storage, were examined in order to select the most suitable cooling solution. Heavy-duty gas turbine cogeneration systems with and without absorption units were modeled, as well as various industrial sectors, i.e., paper and pulp, pharmaceuticals, food processing, textiles, tanning, and building materials. The ambient temperature variations were modeled so the effects of climate could be accounted for in the simulation. The results validated the advantages of gas turbine cogeneration with absorption air cooling as compared to other systems without air cooling.

  10. Modeling and control of a proton exchange membrane fuel cell with the air compressor according to requested electrical current

    Directory of Open Access Journals (Sweden)

    Malekbala Mohammad Rahim

    2015-01-01

    Full Text Available The aim of this paper is to design and investigate the dynamic behavior of a PEM fuel cell system. Dynamic analysis of a PEM fuel cell system has been done in Matlab\\Simulink software according to electrical current that has been applied from hybrid system. In addition, dynamical fuel cell system has been explained according to oriented control that is started from air injection compressor model. Also hydrogen valve actuator has been controlled according to the compressor model. The results of the fuel cell dynamic model as well as the applied compressor model are fully validated based on the available results in the open literature. Finally, the effects of several operating parameters of the fuel cell system such as anode and cathode pressures, cell voltage, compressor voltage, compressor mass flow rate variation with respect to inlet pressure ratio, net and stack powers on the dynamic behavior of the hybrid system are investigated. The results show that the model can predict the dynamic behavior of the fuel cell system accurately and it can be used directly for any control purposes.

  11. 变频器在空压机恒压供气改造中的应用%Inverter in Transformation of Air Compressor Constant Pressure Air Supply

    Institute of Scientific and Technical Information of China (English)

    翟世宽

    2012-01-01

    Exist for traditional air compressor control to no-load operating power factor is low, serious power waste and two-cylinder temperature rise higher defect, through the use of inverter control system of the air compressor, piston compressor actual operation constant pressure air supply energy-saving air compressor running after the transformation was complete, stable, significant energy savings, and also to meet the requirements of production process.%针对空压机传统控制方式存在空载运行功率因数低、电能浪费严重及二级缸温升高等缺陷,同时根据活塞式空压机实际运行情况,通过采用变频器对空压机控制系统进行恒压供气节能改造.改造完成后,空压机运行稳定、节能效果明显,也满足了生产工艺的要求.

  12. Aging of control and service air compressors and dryers used in nuclear power plants

    Energy Technology Data Exchange (ETDEWEB)

    Moyers, J.C. (Oak Ridge National Lab., TN (USA))

    1990-07-01

    This report was produced under the Detection of Defects and Degradation Monitoring of Nuclear Plant Safety Equipment element of the Nuclear Plant Aging Research Program. This element includes the identification of practical and cost-effective methods for detecting, monitoring, and assessing the severity of time-dependent degradation (aging) of control and service air compressors and dryers in nuclear power plants. These methods are to provide capabilities for establishing degradation trends prior to failure and developing guidance for effective maintenance. The topics of this Phase 1 assessment report are failure modes and causes resulting from aging, manufacturer--recommended maintenance and surveillance practices, and measurable parameters (including functional indicators) for use in assessing operational readiness, establishing degradation trends, and detecting incipient failure. the results presented are based on information derived from operating experience records, manufacturer-supplied information, and input from plant operators. For each failure mode, failure causes are listed by subcomponent, and parameters potentially useful for detecting degradation that could lead to failure are identified. 13 refs., 9 figs., 16 tabs.

  13. Experimental Research of Variable Operating Performance on Water Source Multi-Connected Air-Conditioning System with Digital Scroll Compressor

    OpenAIRE

    Xingwang Zhu; Xueli Nie; Yanli Lv; Chaoxin Wang; Yugui Su

    2013-01-01

    In this study, we study the water source heat pump and digital scroll compressor and experimentally in the multi-connected air-conditioning system. Variable performance is developed when the unit operates in refrigerating and heating mode. The maximum of refrigerating capacity is 36519.95W when inlet water temperature of the condenser is 30°C and dry-bulb temperature of indoor air is 32°C, at the same time the maximum of EER is 4.33 when inlet water temperature of the condenser is 20°C and dr...

  14. Energy saving avoiding the centrifugal motor-compressors air vents discharge to the surrounding atmosphere; Ahorro de energia evitando venteo de aire a la atmosfera en motocompresores centrifugos

    Energy Technology Data Exchange (ETDEWEB)

    Serrano, Alex [Compressor Controls Corporation, Houston, TX (United States)

    1996-12-31

    The motor-compressors are a key part of the industrial processes. The reliability and efficient operation of a compressor is critical. The surge phenomenon is a threat in the reliability of a compressor and therefore for the process. Surge, in a centrifugal compressor is defined as a dramatic flow and pressure drop, including back-flow. This is always a significant process disturbance. Continuous surge results into costly process shutdowns and mechanical damages. To prevent surge, and control the discharge pressure with simple or obsolete controls it is needed to vent air to the surrounding atmosphere. This form of control is very inefficient and costly. An advanced control with leading technology, besides providing an economical value preventing surge damages, offers substantial energy saving reducing or eliminating the venting of air to the atmosphere. [Espanol] Los motocompresores son un aparte clave de los procesos industriales. La confiable y eficiente operacion de un compresor es critica. El fenomeno de surge es una amenaza a la confiabilidad de un compresor y por lo tanto del proceso. El surge en un compresor centrifugo es definido como una dramatica caida de flujo y presion, incluyendo flujo inverso. Esto es siempre un significante disturbio del proceso. El surge continuo resulta en costosos paros de proceso y danos mecanicos. Para prevenir el surge y controlar la presion de descarga con controles simples u obsoletos, es necesario ventear aire a la atmosfera. Esta forma de control es muy ineficiente y costosa. Un control avanzado con tecnologia de punta ademas de proveer valor economico previniendo danos por surge, provee sustanciales ahorros de energia reduciendo o eliminando el venteo de aire a la atmosfera.

  15. Performance Measurement of Revolving Vane Compressor

    OpenAIRE

    Tan, Kok Ming; Choo, Wei Chong; Chee, Michael; Law, Ken; Iswan, Ismail; Ooi, Kim Tiow

    2014-01-01

    Over the years, rotary compressors have gained popularity and widely used in household and automotive air-conditioning applications because of the compact nature and silent characteristics. By engaging a revolutionary concept to elevate the rotary compressor efficiency, a novel compressor mechanism, named the Revolving Vane compressor is invented. The prototype R134a compressor was designed, fabricated, instrumented and tested. Compressor tests were conducted for varying suction pressures, su...

  16. Experimental Research of Variable Operating Performance on Water Source Multi-Connected Air-Conditioning System with Digital Scroll Compressor

    Directory of Open Access Journals (Sweden)

    Xingwang Zhu

    2013-05-01

    Full Text Available In this study, we study the water source heat pump and digital scroll compressor and experimentally in the multi-connected air-conditioning system. Variable performance is developed when the unit operates in refrigerating and heating mode. The maximum of refrigerating capacity is 36519.95W when inlet water temperature of the condenser is 30°C and dry-bulb temperature of indoor air is 32°C, at the same time the maximum of EER is 4.33 when inlet water temperature of the condenser is 20°C and dry-bulb temperature of indoor air is 27°C. The unit operates in heating mode, the maximum of heating capacity and EER is 33275.73W and 3.86 when inlet water temperature of the condenser is 30°C and dry-bulb temperature of indoor air is 20°C.

  17. Analysis on the Method to Start the Compressor of Inverter Air Conditioner%家用变频空调压缩机启动的浅析

    Institute of Scientific and Technical Information of China (English)

    李庆坚; 温得贤; 黄敬雁

    2014-01-01

    介绍并分析了目前行业内常用的压缩机启动方法,针对家用变频空调系统中压缩机在各负载工况下可能因启动力矩不足,而发生压缩机启动失败这一问题,通过对各品牌变频空调压缩机启动波形的分析以及实际的启动效果,得出一种较典型的压缩机启动方式。%This paper introduces and analyzes the common start methods of compressor in the industry. It is difficult to start the compressor of inverter air conditioner when the compressor is in harsh conditions. In this situation,it may put the compressor fail to start. Through the analysis of various brands of compressors of inverter air conditioners’start waveform, a typical starting mode of compressor is obtained.

  18. Study on Improvement of the Suction Valve in a Reciprocating Compressor for an Automotive Air-Conditioner

    Science.gov (United States)

    Koyabu, Eitaro; Tsukiji, Tetsuhiro; Matsumura, Yoshito; Sato, Taizo

    The simplified test model of the commercial reciprocating compressor for an automotive air-conditioner, which is developed in the previous study, is used to measure the displacement of the suction valves using as train gauge and to investigate the velocity distributions of the discharge flow from the valves using PIV (Particle Image Velocimetry) technique. This paper is focused on the effects of shape of the suction valve on the vibration-reduction. First, the size of the conventional valve hole and the width of the tip of the conventional valve are changed and seven new valves are manufactured to reduce the vibration of the valve. Consequently, it is found that one of the new valves is the most effective for the vibration-reduction. Next the influence of the natural frequency on the vibration-reduction is investigated using one of the new valves by changing the material and the thickness of the valve. Finally, the reason of the vibration-reduction for one of the new valves is discussed from the results of the flow analysis around the valve. The vibration-reduction for one of the new valves is confirmed by measurement of the displacement of the valve in the reciprocating compressor for the automotive air-conditioner.

  19. Auto-ignition of lubricating oil working at high pressures in a compressor for an air conditioner.

    Science.gov (United States)

    Kim, Chul Jin; Choi, Hyo Hyun; Sohn, Chae Hoon

    2011-01-15

    Auto-ignition of lubricating oil working in a compressor for an air conditioner is studied experimentally. The adopted lubricating oil is an unknown mixture with multi-components and known to have flash point temperature of 170 °C. First, its auto-ignition temperature is measured 365 °C at atmospheric pressure. The lubricating oil works under high-pressure condition up to 30 atm and it is heated and cooled down repeatedly. Accordingly, auto-ignition temperatures or flammable limits of lubricating oil are required at high pressures with respect to fire safety. Because there is not a standard test method for the purpose, a new ignition-test method is proposed in this study and thereby, auto-ignition temperatures are measured over the pressure range below 30 atm. The measured temperatures range from 215 °C to 255 °C and they strongly depend on pressure of gas mixture consisting of oil vapor, nitrogen, and oxygen. They are close to flash point temperature and the lubricating oil can be hazardous when it works for high-pressure operating condition and abundant air flows into a compressor. PMID:20934810

  20. 容积式空压机用空气滤清器技术水平现状综述%Overview of Current Technical Level of Air Filter for Displacement Air Compressor

    Institute of Scientific and Technical Information of China (English)

    谭强

    2012-01-01

    评述空压机用空气滤清器的作用,对压缩机机组能效水平\\辅助部件的性能和寿命的影响;对比国内空气压缩机产品技术标准中对空气滤清器的性能和技术要求;概述当前空气滤清器主导产品的使用现状,以及空气滤清器产品标准和试验标准的现状;列出压缩机用空气滤清器要求进行规范化管理的技术条款.期望建立健全压缩机行业空气滤清器产品的技术标准和验收准则,满足压缩机制造厂和最终用户的要求.%This paper reviews the function of air filter for air compressor,the effect on compressor unit energy efficiency level,and the effect on performance and service life of auxiliary parts of the compressor, and contrasts the performance and technical requirements of air filter in domestic air compressor product technical standards and summarizes the current application situation of leading air filter products and the present situation of air filter product standards and test standards.This paper lists the technical items for standardized management of compressor air filter.It is expected to establish and perfect the air filter product technical standards and acceptance criteria of the compressor industry,to meet the compressor manufacturers and end-users requirements.

  1. Numerical Simulation of Wrap Scroll Temperature for Refrigeration and Air Conditioning Compressors

    OpenAIRE

    Rovira, Jordi; Rigola, Joaquim; Pérez-Segarra, Carlos D.; Oliva, Assensi

    2012-01-01

    Being part of a model which simulates the whole consecutive overall compression process in a scroll compressor by solving equations of mass, momentum and energy balance for fluid refrigerant (Rovira et al.,2006), an updated version is presented. In this new model, an energy balance over the scroll wraps is implemented; where temperatures and heat fluxes are obtained dividing the wall into 36 parts (slices) each turn. The scroll wrap is divided into different solid slices; energy balance is ca...

  2. Numerical simulation of wrap scroll temperature for refrigeration and air conditioning compressors

    OpenAIRE

    Rovira Casals, Jordi; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David; Oliva Llena, Asensio

    2012-01-01

    Being part of a model which simulates the whole consecutive overall compression process in a scroll compressor by solving equations of mass, momentum and energy balance for fluid refrigerant (Rovira et al. ,2006), an updated version is presented. In this new model, an energy balance over the scroll wraps is implemented; where temperatures and heat fluxes are obtain ed dividing the wall into 36 parts (slices) each turn. The scroll wrap is divided into different solid slices; energy balan...

  3. Mid-section of a can-annular gas turbine engine with an improved rotation of air flow from the compressor to the turbine

    Energy Technology Data Exchange (ETDEWEB)

    Little, David A.; Schilp, Reinhard; Ross, Christopher W.

    2016-03-22

    A midframe portion (313) of a gas turbine engine (310) is presented and includes a compressor section with a last stage blade to orient an air flow (311) at a first angle (372). The midframe portion (313) further includes a turbine section with a first stage blade to receive the air flow (311) oriented at a second angle (374). The midframe portion (313) further includes a manifold (314) to directly couple the air flow (311) from the compressor section to a combustor head (318) upstream of the turbine section. The combustor head (318) introduces an offset angle in the air flow (311) from the first angle (372) to the second angle (374) to discharge the air flow (311) from the combustor head (318) at the second angle (374). While introducing the offset angle, the combustor head (318) at least maintains or augments the first angle (372).

  4. A novel defrosting method using heat energy dissipated by the compressor of an air source heat pump

    International Nuclear Information System (INIS)

    Highlights: • A novel defrosting method using heat energy dissipated by the compressor was developed and examined. • During the defrosting process, mean temperature difference between the air entering and leaving the indoor coil reached 4.1 °C. • Compared to the traditional method, defrosting time was shortened by 65% while the resuming heating period disappeared. • For the defrosting operation, the total energy consumption was less than 27.9% compared to the traditional method. - Abstract: When an air source heat pump (ASHP) unit is used for space heating at low ambient temperatures in winter, frost may form on its outdoor coil surface. Since the accumulated frost adversely affects its performance and energy efficiency, periodic defrosting of the outdoor coil is necessary. Currently, the reverse-cycle defrosting (RCD) method is widely used for the defrosting of ASHP. However, this operation interrupts space heating during the defrosting process. A time lag occurs to resume heating at end of the defrosting cycle. Moreover, frequent reversing of the 4-way valve may cause mass leakage of the refrigerant, even make the system unsafe. Furthermore, some amount of heat is dissipated to the atmosphere through the compressor casing. To improve the defrosting process and use this waste heat, a novel ASHP unit is developed. The space is heated during the defrosting process using the heat dissipated by the compressor. Experiments using both the RCD method and the novel reverse cycle defrosting (NRCD) method developed in this study are conducted on an ASHP unit of 8.9 kW nominal heating capacity. The experimental results indicated that in the NRCD method, the discharge and suction pressures are increased by 0.33 MPa and 0.14 MPa, respectively, the defrosting time is shortened by 65% while the resuming heating period vanished with the NRCD method, and that the total energy consumption in comparison to RCD method is reduced by 27.9% during the period which is composed

  5. 船用重负荷空气压缩机油的研究%Research on Marine Severe Air Compressor Oil

    Institute of Scientific and Technical Information of China (English)

    岳国良; 冯全科

    2015-01-01

    A severe air compressor oil was developed with naphthenic oil and synthetic ester as base Stock added appropriate antioxidants,metal deactivators and rust inhibitors.The physicochemical properties of this air compressor oil reached to the level of DAB air compressor oil of ISO 6743-3∶2003 “air compressor oil”specifica-tion,and the carbon deposits tendency rig test was passed.%用环烷基油和合成酯为基础油,并加入适量抗氧剂,金属钝化剂和防锈剂,研制了一种重负荷空气压缩机油。该油的理化性能到达了ISO 6743-3∶2003《空气压缩机油》规格中DAB空气压缩机油的水平,并通过了积炭倾向台架试验。

  6. Very-High-Cycle-Fatigue of in-service air-engine blades, compressor and turbine

    Science.gov (United States)

    Shanyavskiy, A. A.

    2014-01-01

    In-service Very-High-Cycle-Fatigue (VHCF) regime of compressor vane and turbine rotor blades of the Al-based alloy VD-17 and superalloy GS6K, respectively, was considered. Surface crack origination occurred at the lifetime more than 1500 hours for vanes and after 550 hours for turbine blades. Performed fractographic investigations have shown that subsurface crack origination in vanes took place inspite of corrosion pittings on the blade surface. This material behavior reflected lifetime limit that was reached by the criterion VHCF. In superalloy GS6K subsurface fatigue cracking took place with the appearance of flat facet. This phenomenon was discussed and compared with specimens cracking of the same superalloy but prepared by the powder technology. In turbine blades VHCF regime appeared because of resonance of blades under the influenced gas stream. Both cases of compressor-vanes and turbine blades in-service cracking were discussed with crack growth period and stress equivalent estimations. Recommendations to continue aircrafts airworthiness were made for in-service blades.

  7. Improvement and Application of Reciprocating Air Compressor%浅谈往复式空压机的改进及运用

    Institute of Scientific and Technical Information of China (English)

    何湘岳

    2014-01-01

    he importance of GuiYe diesel generator room reciprocating air compressor to successfully restart diesel engine during the accidents in power workshop is introduced. The problems and structure principle of reciprocating air compressor before the improve-ment are analyzed. The reciprocating air compressor gradually improved after practice, the success of the diesel engine is started for the accident, the operation of the reciprocating compressor efficiency, saving energy and reducing consumption, safety and environmental improvement are expounded in this article.%介绍贵冶动力车间事故柴油发电机房往复式空压机对全厂停电时柴油机能否成功启动的重要性,对改进前往复式空压机所存在的问题及结构原理进行分析。阐述了通过对往复式空压机逐步改进实践后,对事故柴油机的成功启动、往复式空压机的运行效率、节能降耗、安全环保等方面带来的改善。

  8. Benchmark performance analysis of an ECM-modulated air-to-air heat pump with a reciprocating compressor

    Science.gov (United States)

    Rice, C. K.

    1992-01-01

    A benchmark analysis was conducted to predict the maximum steady- state performance potential of a near-term modulating residential- size heat pump. Continuously variable-speed, permanent-magnet electronically commutated motors (ECMs) were assumed to modulate the compressor and the indoor and outdoor fans in conjunction with existing modulating reciprocating compressor technology. A modulating heat pump design tool was used to optimize this ECM benchmark heat pump, using speed ranges and total heat exchanger sizes per-unit-capacity equivalent to that used by the highest SEER-rated variable-speed unit presently on the market (SEER = 16.4). Parametric steady-state performance optimization was conducted at a nominal design cooling ambient of 95 F (35 C) and at three off-design ambients of 82 F (27.8 C) cooling and 47 F and 17 F (8.3 C and minus 8.3 C) heating. In comparison to the reference commercially available residential unit, the analysis for the ECM benchmark predicted steady-state heating COPs about 35 percent higher and a cooling EER almost 25 percent higher at the nominal design cooling condition. The cooling EER at 82 F (27.8 C) was 13 percent higher than that of the reference unit when a comparable sensible heat ratio of 0.71 was maintained, while an EER gain of 24 percent at the 82 F (27.8 C) rating point was predicted when the sensible heat ratio was relaxed to 0.83.

  9. Investigation of the compressor part-load behaviour and its effects on the per annum energy consumption of the air conditioner; Untersuchung des Kompressor-Teillastverhaltens im Hinblick auf den Jahresverbrauch der Klimaanlage

    Energy Technology Data Exchange (ETDEWEB)

    Martin, Klaus; Lechner, Bernhard [Virtual Vehicle. Kompetenzzentrum - Das virtuelle Fahrzeug Forschungsgesellschaft mbH (ViF), Graz (Austria); Rieberer, Rene [Technische Univ. Graz (Austria); Moenkediek, Thomas [Audi AG, Ingolstadt (Germany)

    2010-07-01

    The air conditioning system is one of the most important ancillary units of a motor vehicle. Energetic optimization of air conditioners has been a key issue of research at AUDI AG during the past few years. As a rule, the cooling capacity of the air conditioner is controlled by adapting the compressor lift if the compressor is driven by the car engine and control via the rotational speed is not possible. As air conditioners ted to be designed for extreme conditions, the compressor will work at part load in most operating conditions. Optimization of the energetic efficiency of the air conditioner also means to look at the part-load behaviour of the compressor. Simulations have been used successfully by AUDI AG for many years now; the have helped to shorten development times and improve the product quality. The contribution describes an advanced model of a swivel plate compressor of a R134a cooling cycle with particular consideration of part-lift operation. The simulation model is based on measurements with continous recording of the piston lift. The focus is on the influence of reduced lift on the compressor efficiency. Another point of interest is the successful integration of the compressor model in the overall refrigerating cycle model which will be used for simulations of system performance and efficiency and for further optimization of the air conditioner. (orig.)

  10. Measurement and Calibration of Centrifugal Compressor Pressure Scanning Instrumentation

    OpenAIRE

    Rivas, Jose R; Lou, Fangyuan; Harrison, Herbert "Trey"; Key, Nicole

    2015-01-01

    The compressor is a key component of a jet engine necessary to compress air for the combustion process. Research to optimize compressor efficiency through the understanding of air flow behavior has led to increased efforts in creating modern compressor test facilities. In collaboration with Honeywell, the High Speed Compressor facility at Zucrow Laboratories has built a centrifugal compressor test cell with instrumentation to measure the temperatures and pressures of the air flow. This facili...

  11. 基于Zigbee的工厂空压站监控系统设计%Zigbee-based factory air compressor station monitor and control system design

    Institute of Scientific and Technical Information of China (English)

    姚仲敏; 李魁杰; 张裕; 潘飞

    2014-01-01

    To solve the problems of current electrical control system of air compressor station, this paper presents a zigbee-based air compressor station monitor and control system. The air compressors effective management is the foundation of the whole control system, as the control of all electrical actuators, inverters and motors is achieved through PLC. The system uses the pressure sensors and flow sensors to collect data from the air compressor network, by means of the Zigbee technology to transmit data, and apply Labview control software for the monitor and control center host computer. Meanwhile, the joints of ZigBee have low power consumption and high flexibility, easy for networking and maintenance.%针对目前的空压站电气控制系统存在的问题,提出了一种基于无线传感网的空压站监控系统。空压机组的有效管理是整个控制系统的基础,通过PLC实现对电气各执行器、变频器、电机等进行控制;利用压力传感器、流量传感器采集空压管网数据,并应用ZigBee技术进行数据传输;采用Labview设计监控中心上位机控制软件;同时ZigBee节点的低功耗和灵活性的特点,方便组网和维护。

  12. Exergetic analysis of a double stage LiBr-H{sub 2}O thermal compressor cooled by air/water and driven by low grade heat

    Energy Technology Data Exchange (ETDEWEB)

    Izquierdo, M. [Instituto C.C. Eduardo Torroja (CSIC), Edificacion y Habitabilidad, Madrid (Spain); Venegas, M.; Garcia, N. [Universidad Carlos III de Madrid (Spain). Departamento de Ingenieria Termica y Fluidos; Palacios, E. [Universidad Politecnica de Madrid (Spain). Departamento de Mecanica Industrial

    2005-05-01

    In the present paper, an exergetic analysis of a double stage thermal compressor using the lithium bromide-water solution is performed. The double stage system considered allows obtaining evaporation temperatures equal to 5{sup o} C using solar heat coming from flat plate collectors and other low grade thermal sources. In this study, ambient air and water are alternatively used as cooling fluids without crystallization problems up to condensation-absorption temperatures equal to 50 {sup o}C. The results obtained give the entropy generated, the exergy destroyed and the exergetic efficiency of the double stage thermal compressor as a function of the absorption temperature. The conclusions obtained show that the irreversibilities generated by the double stage thermal compressor will tend to increase with the absorption temperature up to 45 {sup o}C. The maximum value corresponds to 1.35 kJ kg{sup -}1{sup K-1}. The entropy generated and the exergy destroyed by the air cooled system are higher than those by the water cooled one. The difference between the values increases when the absorption temperature increases. For an absorption temperature equal to 50 {sup o}C, the air cooled mode generates 14% more entropy and destroys 14% more exergy than the water cooled one. Also, the results are compared with those of previous studies for single and double effect air cooled and water cooled thermal compressors. The conclusions show that the double stage system has about 22% less exergetic efficiency than the single effect one and 32% less exergetic efficiency than the double effect one. (author)

  13. 空气压缩机余热回收的实践%Practice of Waste Heat Recovery from Air Compressors

    Institute of Scientific and Technical Information of China (English)

    王佩; 成强

    2015-01-01

    介绍了空气压缩机余热回收系统的工作原理和节能效果,为相关技术人员提供参考,从而达到节能的目的。%This article introduces working principle and energy saving effect of waste heat recovery system of air compressors. It gives references to technological staff to achieve energy saving.

  14. Frequency inverter energy saving reconstruction of screw air compressor%螺杆式空压机变频节能改造方案设计

    Institute of Scientific and Technical Information of China (English)

    吕新磊; 王永华; 高永田

    2012-01-01

    针对螺杆式空压机能耗大、噪音大、自动化程度低等问题,在螺杆式空压机节能原理的基础上,提出了利用变频器对螺杆式空压机进行节能改造的方案.该方案采用安全连锁、PID调节和电机温升控制等技术手段来实现.节能效果分析表明,该方案节电率达到28.3%,具有推广价值.%Aiming at the shortcomings of screw air compressor such as high energy consumption, big noise and low automation level etc, on the basis of the principle of screw air compressor energy-saving, a reforming scheme to save energy of screw air compressor by using frequency inverter was provided. The techniques such as safety chain PID adjustment and motor temperature rising control werer applied in the reforming scheme. Energy saving effect results showed that the energy saving rate reached up to 28. 3%. Reforming scheme has large value to be popularized.

  15. 空压机冷却器结垢原因分析及清洗%Cause Analysis and Cleaning of Air Compressor Cooler Scale Formation

    Institute of Scientific and Technical Information of China (English)

    冀成; 臧克培; 任彦峰

    2014-01-01

    针对空压机长时间运行会在冷却器中产生水垢,使冷却器堵塞导致进、排气温度升高,空气不能被冷却到预定温度,将严重影响空压机运行效率,分析了屯兰矿空压机房的2台ZH10000离心式空压机冷却器结垢的原因,阐述了其清洗原理、清洗溶液的配置浓度、搭建循环清洗冷却器的装置及清洗流程等。通过清洗,除垢效果、腐蚀率等指标均达到了空压机运行要求,确保了空压机的安全经济运转,为该矿井下压风系统的可靠稳定运行提供了保障。%The long running of air compressor can lead to water scale in cooler,to the cooler blocking,the tem-perature of inlet and exhaust increment.The air can not be cooled to the predetermined temperature,will seriously in-fluence the operational efficiency of air compressor.Analyzes the scale formation reason of Tunlan coal mine two ZH10000 centrifugal air compressor cooler,expounds the cleaning principle,concentration of the cleaning solution configuration,build cleaning cycle cooler devices and cleaning processes and so on.By cleaning the indicators such as descaling effect,corrosion rate all reach the compressor operating requirements,It ensures the safe and economic operation of air compressor,provides guarantee for the reliable and stable operation of downhole pressure wind system.

  16. Compressor ported shroud for foil bearing cooling

    Science.gov (United States)

    Elpern, David G.; McCabe, Niall; Gee, Mark

    2011-08-02

    A compressor ported shroud takes compressed air from the shroud of the compressor before it is completely compressed and delivers it to foil bearings. The compressed air has a lower pressure and temperature than compressed outlet air. The lower temperature of the air means that less air needs to be bled off from the compressor to cool the foil bearings. This increases the overall system efficiency due to the reduced mass flow requirements of the lower temperature air. By taking the air at a lower pressure, less work is lost compressing the bearing cooling air.

  17. Experimental investigation on a turbine compressor for air supply system of a fuel cell

    Energy Technology Data Exchange (ETDEWEB)

    Matsuda, Masayasu [Sumitomo Heavy Industries, Ltd., Yokosuka (Japan); Tsuchiyama, Syozo [Shipbuilding Research Association, Minato-ku, Tokyo (Japan)

    1996-12-31

    This report covers part of a joint study on a PEFC propulsion system for surface ships, summarized in a presentation to this Seminar, entitled {open_quotes}Study on a Polymer Electrolyte Fuel Cell (PEFC) Propulsion System for Surface Ships{close_quotes}, and which envisages application to a 1,500 DWT cargo vessel. The aspect treated here concerns a study on the air supply system for the PEFC, with particular reference to system components.

  18. Reform of venting pipeline of air compressor of Datang Duolun 58000 m~3/h air separation plant%大唐多伦58000m~3/h空分设备空压机放空管道改造

    Institute of Scientific and Technical Information of China (English)

    李宁; 于立茂

    2012-01-01

    大唐多伦58000 m3/h空分设备运行过程中,空压机防喘振放空阀反应迟缓,导致空压机卸载和空分设备紧急停车。防喘振放空阀移位并取消相应联锁后,问题解决。但随后出现了放空管道开裂破损现象,改造放空管道后此现象消失。简述空分设备配套空压机组的结构和主要技术参数,详细介绍空压机防喘振放空阀及放空管道出现的问题,阐述原因分析过程、处理措施及其效果。%During run of Datang Duolun 58000 m3/h air separation plant,the slow response of anti-surge venting valve of the air compressor results in unloading of air compressor and urgent shutdown of air separation plant.The trouble is eliminated through shifting of the anti-surge venting valve and canceling corresponding interlocks,however,then after,the venting pipeline is subjected to crack and damage.The said problem is also solved through reforming of the venting pipeline.The structure and main technical parameters of air separation plant-completed air compressor set are briefed,the troubles occurring in air compressor anti-surge venting valve and venting pipeline are detailed,and the cause analysis process,the corrective measures and their effects are described.

  19. CENTAC 压缩机效率分析及修复对策%Efficiency analysis and reparation for CENTAC air compressors

    Institute of Scientific and Technical Information of China (English)

    陈法祥

    2016-01-01

    The CENTAC air compressor was used to provide oxygen for the oxidation reactor .In PTA devices, the compressors had to work for a long term in an environment with acid gas and dust , leading to both serious corro-sion of diffuser pressure devices and erosion wear of impeller backplanes , which made a short life and a serious effi-ciency decline for the compressor with only about 70%of its original design capacity .With a better understanding of the original air compressor design ideas , basis and standards , etc, causes of troubles and factors of efficiency de-cline were discussed for the compressors in PTA devices , and new technology and novel materials were used for compressor reparation to realize its long -term-stable operation .%CENTAC空气压缩机的主要作用是为氧化反应器提供反应所需要的氧气,该压缩机长期在 PTA装置环境下(酸性、粉尘)运行,空压机的叶轮、扩压器以及叶轮背板被腐蚀及冲刷磨损严重,导致这些过流部件使用寿命较短,压缩机的效率下降严重,仅为原设计能力的70%左右。笔者分析PTA装置空压机的各项故障及设备效率严重降低的原因,对比了原有空压机的设计思想、依据及标准等,找出其优点和不足,针对PTA空压机原有设计所存在的缺陷,通过新技术、新材料进行修复解决,实现空压机的长周期稳定运行。

  20. Application of Air Compressor System Waste Heat Recovery in Air-conditioning System%空气压缩机系统余热回收在空调系统中的应用

    Institute of Scientific and Technical Information of China (English)

    吴世凤

    2012-01-01

    对空气压缩机的压缩余热进行回收利用,可以降低压缩空气系统损耗,提高生产力,实现节能降耗.将空压机余热用于空调系统冬季采暖和生活热水供应,节能效果良好,经济效益明显,具有实用和推广价值.%Recovering the waste heat of air compressors, can lower the consumption of energy in compressed air system and increase productivity. Illustrates that the waste heat of air compressors can be successfully applied to the air-conditioning system in winter heating and used to warm the domestic water in the meanwhile. Moreover, the good energy-saving result and the obvious economical benefit both indicate that the waste heat recovery of air compressors will have a bright applied prospect.

  1. Development of Refrigeration Oil for Rotary Vane Compressor of Automobile Air Conditioner%旋叶式汽车空调冷冻机油的研制

    Institute of Scientific and Technical Information of China (English)

    陈美名

    2013-01-01

      介绍旋叶式汽车空调压缩机对冷冻机油的性能要求,研制一种适用于以R134a为制冷剂的压缩机的聚醚类合成冷冻机油,并分析其理化性能,通过台架试验评价其润滑性能和抗氧化性能。结果表明,研制油具有较好的理化性能,很好的润滑性能及抗氧化能力,满足旋叶式压缩机使用要求。%The requirement for performance of refrigeration oil for rotary vane compressor of automobile air conditioner was introduced,and a PAG refrigeration oil was developed for rotary vane compressor with R134a as refrigerant. The physi-cochemical properties of the refrigeration oil were analyzed,and the lubricating performances and antioxidant properties were evaluated through bench tests. The results show that the refrigeration oil has good physicochemical properties,good lu-bricating performances and excellent antioxidant properties,meeting the application requirement of the rotary vane compres-sor.

  2. CFD Analysis of Oil Discharge Rate in Rotary Compressor

    OpenAIRE

    Deng, Liying; Liang, Shebing; Liu, Qiang; Wu, Jun; Xu, Jia

    2012-01-01

    Oil discharge rate in rotary compressor has a significant influence on heat transfer performance of condenser and evaporator in air conditioning system. In order to find out the influence which caused by the structure of rotary compressor on the oil discharge rate, the flow field of rotary compressor has been calculated by VOF method and the lubricant distribution in rotary compressor can be obtained. At the same time, Oil discharge rate in rotary compressor at different operating conditions ...

  3. Analysis on the Process of Link Technology of Piston Air Compressor%活塞式空气压缩机的连杆工艺浅析

    Institute of Scientific and Technical Information of China (English)

    郑勇

    2015-01-01

    本文主要以某活塞式压缩机的连杆为研究对象,对其工艺进行较为全面的分析研究,从而保障了设计的连杆经久耐用,符合实际生产的需要。%Taking a piston air compressor's link as the research object , this paper mainly analyzes its crafts , so as to ensure the designed connecting rod durable and meet the need of actual production .

  4. Waste Heat Recovery and Energy Efficient Analysis of Screw Air Compressors%螺杆式空压机余热回收及节能分析

    Institute of Scientific and Technical Information of China (English)

    郭衷中

    2015-01-01

    介绍了螺杆式空气压缩机的余热回收,着重分析了余热回收的意义,节能计算、节能空间和市场前景。并以某厂为例,进行了实际的节能计算。%waste heat recovery of screw air compressor is Introduced,four aspects of waste heat recovery are emphatically analyzed,including significance,energy-efficient computing energy space and market prospect.Take a factory as an example,energy-efficient is computed.

  5. Air conditioning in a CINEMAXX cinema. Innovative solution involving a screw compressor and direct evaporation; Klimatisierung in einem CINEMAXX-Kino. Innovative Loesung mit Schraubenverdichter und Direktverdampfung

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2001-03-01

    The new CINEMAXX cinema building in the Trier city centre has fully glazed walls and a modern air conditioning system. The system was installed by local organisations. Its key components are two Comer-Dorin screw compressors. [German] Im Trierer Stadtzentrum befindet sich ein neues CINEMAXX-Kino, hinter dessen glaeserner Fassade die Klimaanlage diskret verborgen bleibt. Oertliche Firmen der Branche konnten die Ausschreibung der Klimaanlage zu ihren Gunsten entscheiden und mit Erfahrung und handwerklichem Koennen unter Verwendung zweier Comer-Dorin-Schraubenverdichter eine nachahmenswerte Loesung planen und installieren. (orig.)

  6. Design of Monitoring System for Air Compressors Based on LabVIEW%基于LabVIEW的压风机组监控系统设计

    Institute of Scientific and Technical Information of China (English)

    李高磊; 郑晓亮

    2015-01-01

    Mainly research the monitoring system for mine air compressors ,with the base of the analysis of characteristics of the existing unit air compressors on the basis of the monitoring system, a compressed air unit online monitoring system based on LabVIEW has been set up. The system consists of sensors, signal acquisition card, PLC, inverter and PC monitor screen. Realization of the state unit of the wind pressure parameters real-time online acquisition, real-time control, storage, display and warning, and rely on DataSocket technology enables remote monitoring.%以煤矿压风机组监控系统为研究对象,在分析现有压风机组监控系统特点的基础上,搭建了基于LabVIEW的压风机组在线监控系统。该系统包括传感器、信号采集卡、PLC、变频器和上位机监控界面。实现了对压风机组的状态参数的实时在线采集、实时控制、存储、显示与预警,并依靠DataSocket技术实现了远程监控。

  7. YC12系列空压机升程吸气限制器的加工工艺改装%The Refitting of Processing Technic of YC12 Series Air-compressor Lift Air Induction Limiter

    Institute of Scientific and Technical Information of China (English)

    杨宗斌; 况齐祁; 余新华

    2012-01-01

    YC12系列空压机限制其转速提高的关键问题之一就是气阀,它是易损坏部件.升程吸气限制器是整套阀组的核心,直接影响压缩机的排气量、功率消耗及运转的可靠性.就生产中采用的刀具和工装进行改进作介绍,提高了气阀加工效率,降低生产成本的一种新技术.%One of the key problems of limiting the improvement of the revolution of YC12 series air-compressor is the air valve,which is apt to damage.Among them,lift air induction limiter is the key part of whole set valve hank,which directly influences the air discharge of compressor,power dissipation and the reliability of operation.This paper intends to introduce a new technology which improved the cutter and frock ,enhanced the efficiency of air valve processing and lowered the production cost.

  8. Development of Protection System Preventing 60 000 m3 Air Compressor from Stall%60000m3空压机喘振保护系统的研发

    Institute of Scientific and Technical Information of China (English)

    李学波

    2014-01-01

    This article describes the reason and harm of air compressor stall in detail ,and elaborates the principle of the anti-stall control system .A protection system for 60 000 m3 air compressor is set up .By using the function of DCS and PLC ,we can make the control of compressor fast and reliable .This work has important reference value to the other anti-stall control systems .%简述了喘振的原理及危害。详细阐述了防喘振系统的控制原理,并建立了60000 m3空压机的保护系统,利用DCS和PLC的强大功能实现快速可靠的控制,对其他系统的防喘振控制有着重要的参考价值。

  9. Numerical simulation of radial compressor stage

    OpenAIRE

    Luňáček O.; Syka T.

    2013-01-01

    Article describes numerical simulations of air flow in radial compressor stage in NUMECA CFD software. In simulations geometry variants with and without seals are used. During tasks evaluating was observed seals influence on flow field and performance parameters of compressor stage. Also is described CFDresults comparison with results from design software based on experimental measurements and monitoring of influence of seals construction on compressor stage efficiency.

  10. Experimental Study About An Amount Of Oil Charge On Electric Driven Scroll Compressor For Electric Vehicle

    OpenAIRE

    Nam, Donglim; Lee, Poyoung; Lee, Geonho; Kwon, Yunki; Lee, Jinho

    2014-01-01

    The main roles of the oil in scroll compressor are to lubricate the friction parts, and to reduce the compressor driving power and to improve the durability of the compressor consequently. However, it has another side that could make decrease the efficiency of the heat exchanger and whole air-conditioning system. In the case of compressor, if the oil is charged too much, the compressor driving power will be increased and the compressor overall efficiency will be decreased. Therefore, the init...

  11. Seal Mechanism of Tip Seal in Scroll Compressor

    OpenAIRE

    Fukuta, Mitsuhiro; Ogi, Daisuke; Motozawa, Masaaki; Yanagisawa, Tadashi; Iwanami, Shigeki; Hotta, Tadashi

    2014-01-01

    Scroll compressors are widely used in room air conditioning cycles, package air conditioning cycles, refrigeration, water heater and automobile air conditioning cycles as well as air compressors, helium compressors and vacuum pump. There are two main leakage paths in a compression chamber formed by a fixed scroll and an orbiting scroll. One is the leakage path through a radial clearance between the wraps of fixed and orbiting scroll. The leakage through the radial clearance is prevented by pr...

  12. Air-source heat pump coupled with economized vapor injection scroll compressor and ejector:Design and experimental research

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    Ejector can utilize high pressure energy from liquid mechanism,it can be used in heat pump system coupled with economized vapor injection(EVI)scroll compressor.When running under low temperature conditions,the performance of the EVI system with ejector can be improved further.In this paper,the design method of the heat pump system with ejector is presented,and the process for designing the heat pump with ejector(EVIe)was summarized.One prototype heat pump was designed under the condition of the evaporation temperature of -20oC,and an experimental setup was established to test the prototype.The measured results demonstrated that the heating EER(energy efficiency ratio)of the EVIe could reach about 4%higher than that of the system without the ejector when the heating capacity remained nearly constant.The design method is helpful to development of a heat pump system coupled with scroll compressor and ejector.

  13. Flow Analysis of Upstream Fluid Flow using Simulation for Different Positions of Optimized Inlet Guide Vane in Centrifugal Air Compressor

    Directory of Open Access Journals (Sweden)

    Alok P. Tibrewala

    2016-07-01

    Full Text Available The performance of Inlet Guide Valve is optimized with designing new efficient mechanism for their actuation. Inlet Guide Valve is an umbrella term which comprises both inlet Guide Vanes and the mechanism to actuate them. Guide vanes not only provide the inlet pressure drop but also impart a whirl motion to the gas as it enters the compressor impeller. Since this whirl motion is in the rotational direction of the impeller, it reduces the amount of work the impeller is required to do on the gas. This paper contains the basic concept behind Inlet Guide Vane, their working & importance. Also included is the new designed mechanism. The results of various positions of Inlet Guide Vane on Upstream Fluid Flow are analyzed & include in this paper.

  14. 基于PLC 的空压机远程监控系统的设计与实现%Design and Implementation of Remote Monitoring System of Air Compressor Based on PLC

    Institute of Scientific and Technical Information of China (English)

    李慧玲; 罗敏; 罗春晖

    2014-01-01

    With the development of technology,Many serious equipment aging of our country and facing out .In the modern enterprise,require air compressor device has higher automation level,Adopt computer control is an inevitable trend in the development of air compressor.It can reduce the labor intensity of operators,to ensure reliable safe operation of the air compressor and promote role .Dongfeng company assembly plant has three vehicle assembly line and a test workshop, Workshop need compressed air for air compressor and person from 3 to provide,Located in three air compressor machine room.this topic is mainly to research and development based on kingview software of the monitoring interface.The whole system is controlled with PLC and configuration king software monitor.PLC main control air compressor start and stop, Kingview is used to read the pressure,So that we can understand the system at any time information,adj ust,ensure the normal operation of the production process.%随着技术的发展,我国的许多设备严重老化,即将面临淘汰。在现代化的企业中,要求空压机的控制装置有较高的自动化水平,采用微机控制是空压机发展的必然趋势。它可以减轻操作人员的劳动强度,对空压机的可靠安全运行起到保证和促进作用。东风商用车公司总装配厂有3条整车组装线和一个检测车间,车间所需要的压缩空气由3对空气压缩机和冷干机来提供,分别位于三个空压机房。本课题主要是要研究开发基于组态王软件的监控界面。整个系统是用 PLC 进行控制,组态王软件进行监控。PLC 主要控制空压机的启动和停止,组态王用于读取压力,以便我们随时了解系统信息,进行调整,确保生产程序的正常运行。

  15. Case Study regarding the test of the new screw compressor with high delivery pressure - 45 bara - on the test bench (with air

    Directory of Open Access Journals (Sweden)

    Valentin PETRESCU

    2012-12-01

    Full Text Available Screw compressors, which are part of positive displacement compressors, can find an increasing use in gas industry and beyond due to their advantages. Maximal parameters of these devices, done by Comoti under GHH-Rand license stop at a maximum flow of 3000 Nm3/hour and 26 bara discharge pressure. The needs of potential beneficiaries have imposed the necessity to design and manufacture a new family of screw compressors and oil injection able to develop a discharge pressure of 45 bara with flow rates up to 5000 Nm3/hour. This paper presents the design and experimental test phases – for the first screw compressor with discharge of pressure up to 45 bara – CU90 HP. Continue research and development have allowed to this type of screw-compressor – to find a market position, diversifying its size range in the last decade in a manner more explosive, if we refer to other types of compressors.

  16. 双变频压缩机并联系统及其在多联机上的应用%The System With Two Parallel Connected Variable Speed Compressors and Its Application on Multiple-split Air-conditioner

    Institute of Scientific and Technical Information of China (English)

    胡锐

    2014-01-01

    The system with two parallel connected variable speed compressors is a new air-conditioner system which has two variable speed compressors in a outdoor unit instead of one inverter compressor. Through theory analyzing and testing, we prove that this system is more efficient than the traditional system with one variable speed compressor, especially on multiple-split air-conditioner whose load is variable.%双变频压缩机并联系统是通过使用两台小排气量的变频压缩机代替传统的单变频压缩机的一种新型空调系统。经理论分析及试验验证,双变频压缩机并联系统应用于负荷变化大的多联机组时比传统的单压缩机系统能效优势明显。

  17. The System with Two Parallel Connected Variable Speed Compressors and Its Application on Multiple-split Air-conditioner%双变频压缩机并联系统及其在多联机上的应用

    Institute of Scientific and Technical Information of China (English)

    胡锐

    2014-01-01

    双变频压缩机并联系统是通过使用两台小排气量的变频压缩机代替传统的单变频压缩机的一种新型的空调系统。经理论分析及试验验证,双变频压缩机并联系统应用于负荷变化大的多联机组,比传统的单压缩机系统能效优势明显。%The system with two parallel connected variable speed compressors is a new air-conditioner system which has two variable speed compressors in a outdoor unit instead of one inverter compressor. Through theory analyzing and testing, we proved that this system is more efficient than the traditional system with one variable speed compressor, es-pecially on multiple-split air-conditioner whose load is variable.

  18. Supersonic compressor

    Energy Technology Data Exchange (ETDEWEB)

    Roberts, II, William Byron; Lawlor, Shawn P.; Breidenthal, Robert E.

    2016-04-12

    A supersonic compressor including a rotor to deliver a gas at supersonic conditions to a diffuser. The diffuser includes a plurality of aerodynamic ducts that have converging and diverging portions, for deceleration of gas to subsonic conditions and then for expansion of subsonic gas, to change kinetic energy of the gas to static pressure. The aerodynamic ducts include vortex generating structures for controlling boundary layer, and structures for changing the effective contraction ratio to enable starting even when the aerodynamic ducts are designed for high pressure ratios, and structures for boundary layer control. In an embodiment, aerodynamic ducts are provided having an aspect ratio of in excess of two to one, when viewed in cross-section orthogonal to flow direction at an entrance to the aerodynamic duct.

  19. Research Status of the Noise in Rotary Air Conditioner Compressor for Automotive%车用旋转式空调压缩机噪声研究现状

    Institute of Scientific and Technical Information of China (English)

    邹杨; 叶禾; 杨诚

    2012-01-01

    旋转式空调压缩机的噪声直接影响空调系统舒适性,回顾了旋转式压缩机噪声的国内外研究现状,对旋转式压缩机的噪声进行分类评述,最后讨论了目前研究存在的问题并对未来的研究做了展望.%The noise of rotary air conditioner compressor directly affects the comfort of air conditioning systems, this paper reviews the recent study at home and abroad which about the rotary compressor noise,classifies comments about those noises,and finally discusses the problems of current research and makes prospects for futher research.

  20. Visualization of Flow in Scroll Compressor by Radiography

    OpenAIRE

    Chikano, Masatsugu; SHIMIZU Hayato; Tsuchiya, Takeshi; Tojo, Kenji

    2012-01-01

    Saving energy and resources in the air conditioning industry is required in order to protect the global environment. To save resources, miniaturization of the compressor in air conditioners is necessary. This miniaturization will increase the oil circulation rate (OCR) of the compressor because the oil separation space will be reduced. To improve the oil separation efficiency, it is necessary to understand the appearance of the flow of oil and refrigerant in the compressor chamber. This paper...

  1. Discussion on Control Model of Air Compressors Based on Multi-Agent%基于Multi-Agent的压风机组控制模型的探讨

    Institute of Scientific and Technical Information of China (English)

    史志鹏; 雷汝海

    2011-01-01

    针对当前矿井压风系统由于采用滞后控制方式而导致的耗能问题,通过比较当前几种压风机组控制方式的优劣,提出了一种基于Multi-Agent的压风机组控制模型,给出了Multi-Agent模型框架,阐述了模型框架中的每个Agent的功能以及各个Agent之间的交互方式;并对模型仿真的可行性进行了探讨,提出了以面向对象技术和ACL语言对模型进行仿真的思路.%For the problem of power consumption caused by delay of control mode of current aircompressed system used in mine, a control model of air compressors based on Multi-Agent was proposed by comparing with advantages and disadvantages of several control modes. Model framework of MultiAgent was given, function and interaction mode of each Agent in the framework was described, feasibility of the model simulation was discussed, and a simulation way was put forward which uses object-oriented technology and ACL to simulate model.

  2. COMPRESSOR TYPE OZONATOR

    Directory of Open Access Journals (Sweden)

    Gulyaev P. V.

    2016-05-01

    Full Text Available The article is devoted to the development of a compressor type ozonator. It describes the design of a high-productivity compressor ozone generator, which can be used for industrial decontamination of mixed feeds, water, milk, and in the system of presowing treatment of seeds. This construction allows generating ozone with high concentration to 5 g/m3 at high feed air or oxygen from the compressor station (up to 2000 l/min. The article describes the design of the basic elements of tubular ozone generator, examines the factors influencing the productivity of the ozonator. The proposed mathematical model allows calculating the productivity of the ozonator when considering multiple influencing factors. These factors take into account: the parameters of supply voltage, such as the magnitude and frequency of the supply voltage; the configuration and geometrical parameters of electrodes such as, the area of the electrodes, the configuration of the surface of the electrodes and distance between electrodes; parameters dielectric barrier; and the transported gas parameters such as volume, temperature, pressure and composition. Special attention is paid to the design of the electrodes made of woven wire mesh with mesh sizes from 1.5×1.5 to 2.0×2.0 mm. It is noted, that such electrodes allow obtaining the maximum productivity of an ozonator, and they do not lead to overheating of the dielectric barrier, and do not output down the generator. In the same way, the article presents the results of the mathematical modeling of ozone generator productivity while changing various factors

  3. Improved Regenerative Sorbent-Compressor Refrigerator

    Science.gov (United States)

    Jones, Jack A.

    1992-01-01

    Conceptual regenerative sorbent-compressor refrigerator attains regeneration efficiency and, therefore, overall power efficiency and performance greater than conventional refrigerators. Includes two fluid loops. In one, CH2FCF3 (R134a) ciculates by physical adsorption and desorption in four activated-charcoal sorption compressors. In other, liquid or gas coolant circulated by pump. Wave of regenerative heating and cooling propagates cyclically like peristatic wave among sorption compressors and associated heat exchangers. Powered by electricity, oil, gas, solar heat, or waste heat. Used as air conditioners, refrigerators, and heat pumps in industrial, home, and automotive applications.

  4. THERMODYNAMIC DESIGN OF CENTRIFUGAL COMPRESSOR FOR TURBOCHARGER

    OpenAIRE

    Sonawane Shubham*, Sondkar Pratik, Qasim Siddiqui, Phirke Indraneel, Prof. R. P. Kakde

    2016-01-01

    The purpose of a turbocharger is to increase the power output of an engine by supplying compressed air to the engine intake manifold so that fuel can be burnt efficiently. In this work, thermodynamic design of a high pressure ratio centrifugal compressor, for 75 kW class engines, was carried out. A pressure ratio of 2.8 was considered with a compressor rotational speed of 60,000 RPM. The compressor was designed for vane less diffuser. The impeller designs were obtained using ci...

  5. Refrigeration system having dual suction port compressor

    Energy Technology Data Exchange (ETDEWEB)

    Wu, Guolian

    2016-01-05

    A cooling system for appliances, air conditioners, and other spaces includes a compressor, and a condenser that receives refrigerant from the compressor. The system also includes an evaporator that receives refrigerant from the condenser. Refrigerant received from the condenser flows through an upstream portion of the evaporator. A first portion of the refrigerant flows to the compressor without passing through a downstream portion of the evaporator, and a second portion of the refrigerant from the upstream portion of the condenser flows through the downstream portion of the evaporator after passing through the upstream portion of the evaporator. The second portion of the refrigerant flows to the compressor after passing through the downstream portion of the evaporator. The refrigeration system may be configured to cool an appliance such as a refrigerator and/or freezer, or it may be utilized in air conditioners for buildings, motor vehicles, or other such spaces.

  6. Centrifugal reciprocating compressor

    Science.gov (United States)

    High, W. H.

    1980-01-01

    Efficient compressor uses centrifugal force to compress gas. System incorporates two coupled dc motors, each driving separate centrifugal reciprocating-compressor assembly. Motors are synchronized to accelerate and decelerate alternately.

  7. 汽车空调压缩机吸入管钎焊工艺设计%Design of soldering process for suction pipe in automobile air conditioning compressor

    Institute of Scientific and Technical Information of China (English)

    王红宾; 白钢; 付春坤

    2012-01-01

    吸入管与压缩机连接处的制冷剂泄漏是汽车空调系统的常见问题,制冷剂泄漏严重影响压缩机效率,并增加能耗、污染环境.在现有钎焊工艺的基础上,结合生产实际,设计和优化钎焊工艺参数,改善钎焊接头性能,提高焊接质量,解决汽车空调压缩机吸入管的泄漏问题.利用UG三维软件设计效率更高、更便捷的钎焊工装夹具,以提高生产效率.%The leakage of refrigerants which seriously impact on the compressor efficiency and increase energy consumption and environmental pollution is the common problems of automotive air conditioning system in the place that the suction pipe and compressor connection.Based on the existing brazing process,combining with practices,this paper designs and optimizes brazing process parameters to improve the performance of brazing joint and brazing quality and solve problems that the suction pipe of automobile air-conditioner compressor leaks.Using UG 3D software,designs brazing jig that is more efficient and convenient to improve production efficiency.

  8. Energy Saving Potential in Existing Compressors

    OpenAIRE

    Cipollone, Roberto; Vittorini, Diego

    2014-01-01

    The Compressed Air Sector (CAS) is responsible for a relevant part of energy consumption, accounting for a mean 10% of the world-wide electricity needs. This ensures about the importance of the CAS issue when sustainability, in terms of energy saving and CO2 emissions reduction, is in question. Since the compressors alone account for a mean 15% of the industry overall electricity consumption, it appears vital to pay attention towards machine performances. The paper deals with compressor techn...

  9. Coatings for Fuel Cell Propulsion Compressor Bearings Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Fuel cell air handling systems require clean and contaminant-free inlet air, which dictates that oil-free, motorized, compressor/expander systems should be used....

  10. Stage-by-Stage and Parallel Flow Path Compressor Modeling for a Variable Cycle Engine, NASA Advanced Air Vehicles Program - Commercial Supersonic Technology Project - AeroServoElasticity

    Science.gov (United States)

    Kopasakis, George; Connolly, Joseph W.; Cheng, Larry

    2015-01-01

    This paper covers the development of stage-by-stage and parallel flow path compressor modeling approaches for a Variable Cycle Engine. The stage-by-stage compressor modeling approach is an extension of a technique for lumped volume dynamics and performance characteristic modeling. It was developed to improve the accuracy of axial compressor dynamics over lumped volume dynamics modeling. The stage-by-stage compressor model presented here is formulated into a parallel flow path model that includes both axial and rotational dynamics. This is done to enable the study of compressor and propulsion system dynamic performance under flow distortion conditions. The approaches utilized here are generic and should be applicable for the modeling of any axial flow compressor design accurate time domain simulations. The objective of this work is as follows. Given the parameters describing the conditions of atmospheric disturbances, and utilizing the derived formulations, directly compute the transfer function poles and zeros describing these disturbances for acoustic velocity, temperature, pressure, and density. Time domain simulations of representative atmospheric turbulence can then be developed by utilizing these computed transfer functions together with the disturbance frequencies of interest.

  11. 转速可控型房间空调器用压缩机能效评价方法研究及应用%Analysis and Application of Evaluation Method on Compressors for Variable Speed Room Air Conditioners

    Institute of Scientific and Technical Information of China (English)

    张海锋; 吴建华; 厉彦忠

    2013-01-01

    The efficiency requirement of room air conditioner (RAC) has became stricter and stricter with the development of global environment consciousness. The efficiency evaluation method of RAC has been updated from single working condition to aunnal performance factor (APF) with multiple working condition. Performance evaluation method of compressors must be changed accordingly which account for main energy consumption of RAC. Compressor efficiency of annual performance (COAP) is proposed to evaluate the efficiency level of inverter compressor which is applied in variable speed RAC with multiple working conditions. Actual operation efficiency can be indicated by COAP because inverter compressor performance is considered according to COAP. In order to simplify test procedure of COAP, standard test conditions and its weight are generated .Then the effect of efficiency curve of inverter compressor on COAP is discussed . Finally examples with this method are illustrated for compressor matching and design optimization.%  随着全球环境保护意识的加强,家用空调能耗水平不断增高,房间空调器能效评价方法已从单工况向全年运行效率(APF)转变。压缩机作为空调器中的主要耗能部件,其能效评价方法也要随之变化。这里提出了变速压缩机全年综合能效比指标--COAP来衡量压缩机在全年变工况条件下的运行效率,此指标综合考虑了变速压缩机全年运行的能效情况,能客观反映压缩机在不同气候条件下实际运行效率。为简化测试COAP,给出了COAP基准工况及各工况权重,讨论了压缩机效率曲线对COAP的影响,最后通过举例说明如何利用COAP进行压缩机选型及设计优化。

  12. The New S-RAM Air Variable Compressor/Expander for Heat Pump and Waste Heat to Power Application

    Energy Technology Data Exchange (ETDEWEB)

    Dehoff, Ryan R [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Jestings, Lee [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Conde, Ricardo [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2016-05-23

    S-RAM Dynamics (S-RAM) has designed an innovative heat pump system targeted for commercial and industrial applications. This new heat pump system is more efficient than anything currently on the market and utilizes air as the refrigerant instead of hydrofluorocarbon (HFC) refrigerants, leading to lower operating costs, minimal environmental costs or concerns, and lower maintenance costs. The heat pumps will be manufactured in the United States. This project was aimed at determining the feasibility of utilizing additive manufacturing to make the heat exchanger device for the new heat pump system. ORNL and S-RAM Dynamics collaborated on determining the prototype performance and subsequently printing of the prototype using additive manufacturing. Complex heat exchanger designs were fabricated using the Arcam electron beam melting (EBM) powder bed technology using Ti-6Al-4V material. An ultrasonic welding system was utilized in order to remove the powder from the small openings of the heat exchanger. The majority of powder in the small chambers was removed, however, the amount of powder remaining in the heat exchanger was a function of geometry. Therefore, only certain geometries of heat exchangers could be fabricated. SRAM Dynamics evaluated a preliminary heat exchanger design. Although the results of the additive manufacturing of the heat exchanger were not optimum, a less complex geometry was demonstrated. A sleeve valve was used as a demonstration piece, as engine designs from S-RAM Dynamics require the engine to have a very high density. Preliminary designs of this geometry were successfully fabricated using the EBM technology.

  13. Numerical Investigation of Flow in a Centrifugal Compressor

    Science.gov (United States)

    Grishin, Yu. A.; Bakulin, V. N.

    2015-09-01

    With the use of the domestic software suite of computational hydrodynamics Flow Vision based on application of the method of control volumes, numerical simulation of air composition and delivery by a centrifugal compressor employed for supercharging a piston engine has been carried out. The head-flow characteristics of the compressor, as well as the 3D fields of flow velocity and pressure distributions in the elements of the compressor flow passage, including the interblade channels of the impeller, have been obtained for various regimes. In the regimes of diminished air flow rate, surging phenomena are identified, characterized by a return flow. The application of the technique of numerical experiment will make it possible from here on to carry out design optimization of the compressor flow passage profile and thus to improve its basic characteristics — the degree of pressure increase, compressed air flow rate, and the efficiency — as well as to reduce the costs of the development and production of compressors.

  14. 基于ANSYS的往复式空气压缩机活塞杆的强度分析%Strength Analysis of Piston Rod of Reciprocating Type Air Compressor Based on ANSYS

    Institute of Scientific and Technical Information of China (English)

    李明; 武伟

    2015-01-01

    活塞杆是往复式空气压缩机的核心部件和易损件,活塞杆断裂造成的设备故障占重大安全事故的1/4以上。在往复式空气压缩机的运行过程中活塞杆推动活塞做往复运动并承受拉、压两种工况交变载荷,因此活塞杆的断裂与频繁的交变作用力密切相关。本文以大型往复式空气压缩机活塞杆为研究对象,应用有限元分析软件ANSYS对其进行结构强度分析以确定能否满足静强度及疲劳强度安全系数要求。其结论对往复式空气压缩机活塞杆的设计与优化具有一定的理论指导意义。%Piston rod is the core and vulnerable component of reciprocating type air compressor. The equipment failure ratio caused by piston rod fracture is more than 1/4. During the operational process of reciprocating type air compressor, the pistons were propelled by piston rods to do alternative motion. The piston rod was beard cyclic loading in push and pressure working conditions, so the piston rod fracture is closely related to the frequent alternating force. In this paper, the piston rod of large scale reciprocating type air compressor was researched as subject, the structure strength of piston rod was analyzed by finite element analysis software ANSYS. The simulated results were used for evaluating static strength and fatigue strength request. The analysis results provide some theoretical guidance for designing and improving piston rod of reciprocating type air compressor.

  15. 空调压缩机铝合金连杆的液态模锻%Hydraulic Forging of the Al Alloy Connection Rod of the Air-Conditioner Compressor

    Institute of Scientific and Technical Information of China (English)

    屈华昌

    2001-01-01

    分析了空调压缩机用铝合金连杆的工艺特点和技术要求,介绍了液态模锻的模具结构和工作过程,同时还介绍了铝合金连杆液态模锻的工艺参数。%The processing characteristics and the technical requirement of the aluminum alloy connection rod for the air-conditioner compressor were analyzed. The structure and working process of the hydraulic forging die were introduced. And the processing data for hydraulically forging the aluminum alloy connection rod were stated.

  16. Dual-worm screw compressors; Compresseurs bi-vis

    Energy Technology Data Exchange (ETDEWEB)

    Baleydier, J.P. [Bitzer France, 69 - Lyon (France)

    1997-12-31

    Low power worm-screw moto-compressors are used in any king of refrigerating machineries and more and more in air conditioning systems. This paper presents the principle of dual-screw moto-compressors: worm-screw technology, role of oil (lubrication, tightness, cooling), compression, internal pressure, power reduction, lubrication, economizer, operation, model selection and accessories. (J.S.)

  17. Application and Energy-saving Effect of Adjustable Air Flow on Reciprocating Compressor%可调余隙调节气量在往复式压缩机上的应用及节能效果

    Institute of Scientific and Technical Information of China (English)

    周兰生; 宁德君

    2014-01-01

    可调余隙调节气量是在固定余隙调节气量的基础上,对往复压缩机气量调节系统进行改造。通过实际应用表明,该系统较往复式压缩机传统的气量调节方法具有输出气量的稳定性好、气量无级调节、系统维护费用低、参数设置灵活、节能、系统可靠的特点。%Adjustable air flow is defined as transformation of reciprocating compressor system on the basis of fixed air flow.It is shown through application that this system has merits of great stability , free air flow adjustment , low cost, reliability and flexible parameter setting .

  18. Compressors selection and sizing

    CERN Document Server

    Brown, Royce N

    2005-01-01

    This practical reference provides in-depth information required to understand and properly estimate compressor capabilities and to select the proper designs. Engineers and students will gain a thorough understanding of compression principles, equipment, applications, selection, sizing, installation, and maintenance. The many examples clearly illustrate key aspects to help readers understand the ""real world"" of compressor technology.Compressors: Selection and Sizing, third edition is completely updated with new API standards. Additions requested by readers include a new section on di

  19. Gravity Independent Compressor Project

    Data.gov (United States)

    National Aeronautics and Space Administration — We propose to develop and demonstrate a small, gravity independent, vapor compression refrigeration system using a linear motor compressor which effectively...

  20. The Compressor Recycle System

    OpenAIRE

    Barstad, Bjørn Ove

    2010-01-01

    The compressor recycle system is the main focus of this thesis. When the mass flow through a compressor becomes too low, the compressor can plunge into surge. Surge is a term that is used for axisymmetric oscillation through a compressor and is highly unwanted. The recycle system feeds compressed gas back to the intake when the mass flow becomes too low, and thereby act as a safety system.A mathematical model of the recycle system is extended and simulated in SIMULINK. The mathematical model ...

  1. 新型直线往复式空压机的结构及其运动特性分析%Constitution of a kind of linear reciprocating air compressor and its motion characteristics analysis

    Institute of Scientific and Technical Information of China (English)

    耿爱农

    2011-01-01

    为了减少往复式空压机活塞对气缸的侧压力,提出一种新型齿轮约束直线往复活塞式空气压缩机,该机利用一对规格相同、面对面布局并且转向相反的锥齿轮,各自驱动一个连杆,并由这2个连杆共同驱动活塞作纯粹的直线往复运动。与传统的往复活塞式空压机相比,新型空压机可以实现活塞与气缸的无侧压运动配合,而且活塞往复运动派生的往复惯性力、连杆摇摆运动派生的摇摆惯性力矩均可以有效平衡。%A new type of gear-restrained linear reciprocating air compressor is proposed to reduce the sidepressure between the piston and the cylinder, m winch two bevel gears wlm same size are setface to and rotates in opposite direction, as well as respectively drive two connecting rods that jointly drive the piston to make pure linear reciprocation. Compared with the conventional reciprocating air compressor, the new-type compressor can realize movement fit of the piston and the cylinder without side pressure, and the reciprocating inertia force produced from the piston's reciprocating movement and the swing inertia torque produced from the connecting rod's swing movement can be easily eliminated.

  2. Study on Mechanism Analysis and Motion Simulation of the Scroll Compressor

    Science.gov (United States)

    Su, Donghai; Wang, Zhijun

    In this paper, according to the application practice of scroll compressor for refrigeration and air-conditioning, various factors affecting the whole refrigeration effect of the compressor are studied, the influence of scroll wrap's different forms on compressor exhaust angle and the compression ratio is stated, and it establishes the working principle simulation of the compressor's main parts, and further corrects the form of vortex lines according to simulation results.

  3. Study of Permanent Magnet Synchronous Motor Used in Compressor for High-Efficient Inverter Air Conditioner%高效变频空调压缩机用永磁同步电机研究

    Institute of Scientific and Technical Information of China (English)

    张少丕; 陈世元; 皮明超

    2014-01-01

    Critical dimension of permanent magnet synchronous motor used in compressor for the home inverter air conditioner was confirmed by magnetic circuit analysis method, and motor performances were calculated accurately by finite element method. Comparing the difference between theoretical designed value and testing value of motor performances, compared the performance of inverter compressor and the corresponding air conditioner, the actual test showed that this method was accurate and feasible.%拟采用磁路解法确认家用变频空调器的压缩机用调速永磁同步电机的关键尺寸,再利用有限元分析方法精确计算电机的各项性能。对比电动机性能的理论设计值与实际测试值的差异,同时对比了变频压缩机和对应空调器的性能,通过实际测试说明该方法的准确性与可行性。

  4. Treating energy saving as a resource to exploit: successful application of recovering the waste heat of air compressor%把节能当作一种资源去开发:空压机余热回收的成功应用

    Institute of Scientific and Technical Information of China (English)

    陈勇

    2012-01-01

    介绍了空气压缩系统的运行和耗能情况,针对其中存在的节能空间进行了改造,分析了压缩机的余热利用产生的经济效益。%The running and energy consumption situations of air compressor system were intro- duced. Aiming at the possibility of energy saving, modifications were carried out. Economic bene- fits produced from recovering the waste heat of air compressor were analyzed.

  5. Bidirectional grating compressors

    Science.gov (United States)

    Wang, Cheng; Li, Zhaoyang; Li, Shuai; Liu, Yanqi; Leng, Yuxin; Li, Ruxin

    2016-07-01

    A bidirectional grating compressor for chirped pulse amplifiers is presented. It compresses a laser beam simultaneously in two opposite directions. The pulse compressor is shown to promote chirped pulse amplifiers' output energy without grating damages. To verify the practicability, an experiment is carried out. In addition, a crosscorrelation instrument is designed and set up to test the time synchronization between these two femtosecond pulses.

  6. Noise evaluation of automotive A/C compressor

    Directory of Open Access Journals (Sweden)

    Sameh M. Metwally, Mohamed I. Khalil, Shawki A. Abouel-seoud

    2011-05-01

    Full Text Available Passenger compartment's interior noise and thermal performance are essential criteria for the driving comfort of vehicles. The air-conditioning system influences both field of comfort. It creates comfortable thermal conditions. On the other hand, the noise radiation of the air-condition system's components can be annoying. The blower, the air distribution ducts and the registers affect air rush noise. In some cases, the refrigerant flow creates hissing noise. Such noise has a great influence on vehicle acoustical comfort and on overall quality perception of a vehicle Therefore, the acoustic performance of air-condition compressors become more important for passenger comfort. At engine idling and at extreme temperatures the air-condition compressor can be audible as the significant sound source. However, the aim of this paper is to quantify air-borne noise characteristics of vehicle air-condition compressor. A simulated experimental model comprises a small wooden box with dimensions of 0.5 x 0.5 x 0.5 m represented the principle of hemi-anechoic room was designed and acoustic characteristics of the sound field inside the box were determined. The air-condition compressor characteristics parameters considered in this paper are fan position and electric motor speed. In addition, a single number of the air column natural frequency is calculated. The results indicate that significant information can be obtained in order to investigate the vehicle air-condition compressor and consequently improve the vehicle interior quietness.

  7. Noise evaluation of automotive A/C compressor

    Energy Technology Data Exchange (ETDEWEB)

    Metwally, Sameh M.; Khalil, Mohamed I.; Abouel-seoud, Shawki A. [Automotive and Tractors Dept., Faculty of Engineering, Helwan University, Cairo (Egypt)

    2011-07-01

    Passenger compartment's interior noise and thermal performance are essential criteria for the driving comfort of vehicles. The air-conditioning system influences both field of comfort. It creates comfortable thermal conditions. On the other hand, the noise radiation of the air-condition system's components can be annoying. The blower, the air distribution ducts and the registers affect air rush noise. In some cases, the refrigerant flow creates hissing noise. Such noise has a great influence on vehicle acoustical comfort and on overall quality perception of a vehicle Therefore, the acoustic performance of air-condition compressors become more important for passenger comfort. At engine idling and at extreme temperatures the air-condition compressor can be audible as the significant sound source. However, the aim of this paper is to quantify air-borne noise characteristics of vehicle air-condition compressor. A simulated experimental model comprises a small wooden box with dimensions of 0.5 x 0.5 x 0.5 m represented the principle of hemi-anechoic room was designed and acoustic characteristics of the sound field inside the box were determined. The air-condition compressor characteristics parameters considered in this paper are fan position and electric motor speed. In addition, a single number of the air column natural frequency is calculated. The results indicate that significant information can be obtained in order to investigate the vehicle air-condition compressor and consequently improve the vehicle interior quietness.

  8. IC ENGINE SUPERCHARGING AND EXHAUST GAS RECIRCULATION USING JET COMPRESSOR

    Directory of Open Access Journals (Sweden)

    Adhimoulame Kalaisselvane

    2010-01-01

    Full Text Available Supercharging is a process which is used to improve the performance of an engine by increasing the specific power output whereas exhaust gas recirculation reduces the NOx produced by engine because of supercharging. In a conventional engine, supercharger functions as a compressor for the forced induction of the charge taking mechanical power from the engine crankshaft. In this study, supercharging is achieved using a jet compressor. In the jet compressor, the exhaust gas is used as the motive stream and the atmospheric air as the propelled stream. When high pressure motive stream from the engine exhaust is expanded in the nozzle, a low pressure is created at the nozzle exit. Due to this low pressure, atmospheric air is sucked into the expansion chamber of the compressor, where it is mixed and pressurized with the motive stream. The pressure of the mixed stream is further increased in the diverging section of the jet compressor. A percentage volume of the pressurized air mixture is then inducted back into the engine as supercharged air and the balance is let out as exhaust. This process not only saves the mechanical power required for supercharging but also dilutes the constituents of the engine exhaust gas thereby reducing the emission and the noise level generated from the engine exhaust. The geometrical design parameters of the jet compressor were obtained by solving the governing equations using the method of constant rate of momentum change. Using the theoretical design parameters of the jet compressor, a computational fluid dinamics analysis using FLUENT software was made to evaluate the performance of the jet compressor for the application of supercharging an IC engine. This evaluation turned out to be an efficient diagnostic tool for determining performance optimization and design of the jet compressor. A jet compressor was also fabricated for the application of supercharging and its performance was studied.

  9. 离心压缩机气流激振实例分析%Example Analysis of Air Excitation of Centrifugal Compressor

    Institute of Scientific and Technical Information of China (English)

    李晓刚; 陈俊风; 周运超; 李文涛; 张亚飞; 武云鹏

    2014-01-01

    During the operation of the centrifugal compressor, owing the rotation of gas flow in seal chamber, the change of the circumferential pressure distribution is not completely correspondent with the change of the clearance between rotor and seal chamber. The highest pressure point lags behind the smallest clearance of the seal chamber to a certain degree. Particularly, when the centrifugal compressor unit is to be expanded and renovated, the clearance of seal is narrowed to a large extent so as to improve efficiency. Therefore, gas excitation turns out to be more intensified. By analyzing the gas excitation phenomenon of a certain compressor, this paper suggests basic methods to resolve gas excitation and successfully completes technical reform in regard to the above-mentioned compressor.%离心压缩机在运行过程中由于密封腔中的气流有旋转,使周向压力分布的变化与转子和密封腔之间的间隙变化不完全对应,最高压力点滞后密封腔最小间隙一定角度。特别是在一些扩容改造的离心压缩机组,为了提高效率,将密封的间隙降得很低,使得气流的激振更加突出。本文结合某台离心压缩机出现的气流激振故障,指出了解决气流激振的基本方法并成功完成了对该压缩机的技术改造。

  10. 30 CFR 75.344 - Compressors.

    Science.gov (United States)

    2010-07-01

    ... air course or to the surface and equipped with sensors to monitor for heat and for carbon monoxide or smoke. The sensors shall deenergize power to the compressor, activate a visual and audible alarm located... every 31 days, sensors installed to monitor for carbon monoxide shall be calibrated with a...

  11. 40 CFR 65.112 - Standards: Compressors.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 15 2010-07-01 2010-07-01 false Standards: Compressors. 65.112 Section 65.112 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED... barrier fluid system and that prevents leakage of process fluid to the atmosphere except as provided...

  12. Theoretical and experimental studies of water injection scroll compressor in automotive fuel cell systems

    Energy Technology Data Exchange (ETDEWEB)

    Yuanyang Zhao; Liansheng Li; Huagen Wu; Pengcheng Shu [Xian Jiaotong University (China). School of Energy and Power Engineering

    2005-06-01

    A water injection scroll compressor to supply clean compressed air to an automotive fuel cell system is researched. The water is used as both the lubricant and coolant in the compressor. A thermodynamic model of the water injection scroll compressor considering leakage and heat exchange for use with an automotive fuel cell system was developed using the conservation of energy and mass equations and the equation of state. The results show that the scroll compressor has nearly isothermal compression when injecting water in it. Increasing the compressor rotation speed increases the discharge loss and the volumetric efficiency of the scroll compressor. The difference between the calculated power and the isothermal power increases as the compressor rotation speed rises, which means the efficiency of the compressor decreases. Increasing the flow rate of water injected increases the indicated isothermal efficiency and decreases the discharge temperature. Under the condition studied, the mass flow rate of water has the greatest effect on the discharge temperature. (author)

  13. Seneca Compressed Air Energy Storage (CAES) Project

    Energy Technology Data Exchange (ETDEWEB)

    None

    2012-11-30

    This document provides specifications for the process air compressor for a compressed air storage project, requests a budgetary quote, and provides supporting information, including compressor data, site specific data, water analysis, and Seneca CAES value drivers.

  14. 空调压缩机油粘度与油温过热度的测试研究%Experimental Study on the Oil Viscosity and Oil Superheat Temperature of Air Conditioner Compressor

    Institute of Scientific and Technical Information of China (English)

    魏会军; 刘靖

    2015-01-01

    A method which can test the viscosity of the refrigerating oil on line is used to measure the air conditioner of 1.5HP. Combined with the actual working condition of rotary compressor, the situations which probably lead to a failure without lubricating enough is found. It can provide the data and theory basis to the study of the reliability of the rotary compressor lubrication and the evaluation standard.%通过自行建立的压缩机油粘度与油温过热度在线测试方法,对1.5HP家用变频空调系统进行测试分析,并结合滚动转子式压缩机的实际工作情况,分析了可能导致压缩机润滑失效的情况,为滚动转子式压缩机润滑可靠性的研究及评价提供了数据支持及理论依据。

  15. Flow Analysis around the Suction Valve and the Effect of the Flow on the Vibration-Reduction of the Valve in a Reciprocating Compressor for an Automotive Air-Conditioner

    Science.gov (United States)

    Sato, Taizo; Tsukiji, Tetsuhiro; Koyabu, Eitaro; Nakamura, Yusuke

    In the present study the simplified test model of the commercial reciprocating compressor for an automotive air-conditioner is designed to investigate the velocity distributions of the discharge flow from the suction valve using PIV (Particle Image Velocimetry) technique and to measure the displacement of the valve. The displacement of the conventional valve in the test model is observed using the high speed video camera and is also measured using a strain gauge. On the other hand the velocity distributions around the suction valve are measured using PIV and the relation between the velocity distributions and the movement of the valve is investigated. Furthermore the new valve with the shape improved from the conventional valve is designed and the results of the flow visualization and the measurement of the valve displacement for the new valve are compared with those of the conventional valve. We found that the vibration of the new valve can be suppressed compared with the conventional one from the experiment using both the present test model and the commercial reciprocating compressor. The reason of the vibration-reduction for the new valve is discussed from the results of the present flow analysis.

  16. Analysis of Recognition of Guided Waves in Vibration and Noise in High-pressure Air Compressor in Ships and Warships%高压空压机冲击噪声与振动故障的导波识别分析

    Institute of Scientific and Technical Information of China (English)

    鲍俊瑶; 鲍柏至

    2014-01-01

    冲击振动和冲击噪声是舰船高压空压机的主要振动源和噪声源,识别出冲击振动的产生原因对于降低高压空压机整机的振动与噪声具有十分重要的意义。采用导波传播定位测试技术对4级高压星型空压机冲击振动的产生机理进行了分析,发现第一级排气冲击是引起空压机整机振动与噪声的最主要原因,其次是第二级排气冲击,为采取改进气阀结构来降低高压空压机整机的振动与噪声提供了依据。%Shock vibration and shock noise are main source of vibration and noise of high-pressure air com-pressor in ships and warships.The recognition of the cause of shock vibration is significantly crucial to low-er the impact and noise of complete high-pressure air compressor.By analyzing mechanism of production of vibration shock in 4-level high-pressure star air compressor with the help of guided waves transmission tes-ting technology,the first level of emission impact is the main reason for complete vibration and noise in air compressor while the second level of emission shock ranks the next place.All these findings provide gist for using improved structure of air valve to lower complete vibration and noise in air compressor.

  17. Cooled spool piston compressor

    Science.gov (United States)

    Morris, Brian G. (Inventor)

    1993-01-01

    A hydraulically powered gas compressor receives low pressure gas and outputs a high pressure gas. The housing of the compressor defines a cylinder with a center chamber having a cross-sectional area less than the cross-sectional area of a left end chamber and a right end chamber, and a spool-type piston assembly is movable within the cylinder and includes a left end closure, a right end closure, and a center body that are in sealing engagement with the respective cylinder walls as the piston reciprocates. First and second annual compression chambers are provided between the piston enclosures and center housing portion of the compressor, thereby minimizing the spacing between the core gas and a cooled surface of the compressor. Restricted flow passageways are provided in the piston closure members and a path is provided in the central body of the piston assembly, such that hydraulic fluid flows through the piston assembly to cool the piston assembly during its operation. The compressor of the present invention may be easily adapted for a particular application, and is capable of generating high gas pressures while maintaining both the compressed gas and the compressor components within acceptable temperature limits.

  18. Design of the Secondary Heat Exchange Device for Waste Heat Recovery of Air Compressor%空压机余热回收二次换热装置的设计研究

    Institute of Scientific and Technical Information of China (English)

    岳畏畏; 陈雷田; 徐新恒; 赵新红

    2013-01-01

    随着能源紧张与环境污染等问题的出现,余热回收利用技术变得尤为重要。在余热回收技术领域中,喷油螺杆式空压机余热回收越来越受重视。余热回收装置作为空压机余热回收技术中较为重要的设备,对其进行设计研究很有必要。通过理论计算,集成了对应160 kW喷油螺杆空压机的余热回收二次换热装置,该装置可实现油温自动控制,并有效降低板换结垢的风险,对其进行热回收特性实验研究,结果表明在一次侧进出口水温70℃/50℃、二次侧进出口水温45℃/60℃工况下,热回收能量为99.85 kW,高于空压机额定功率的50%。为空压机余热回收系统设计提供参考依据,对系统施工安装起到了一定的促进作用。%The waste heat recycling technology is particularly important with the emergence of energy tension and environmental pollu-tion. The heat recovery of injection screw air compressor is more and more crucial in the waste heat recovery technology field, so it is neces-sary to research waste heat recovery device. Through the theoretical calculation, integrating the waste heat recovery of secondary heat exchange device on the injection screw air compressor with the corresponding power is 160kw. The device can realize the automatic control of oil tem-perature; meanwhile, it also can effectively reduce the risk of plate in scaling. Results from the experimental research on the heat recovery characteristics show that in the condition of import and export water temperature is 70℃/50℃ of the primary side, or import and export water temperature is 45℃/60℃of the secondary side, the heat recovery power is 99.85kW. It is higher than 50% of the air compressor power rating. This paper provides reference for air compressor heat recovery system design and also plays a certain role in promoting the system installation.

  19. Similarity and cascade flow characteristics of a highly loaded helium compressor

    International Nuclear Information System (INIS)

    Highlights: • The deviation of different similarity criteria is analyzed theoretically. • Flow difference between helium and air compressor cascades is analyzed numerically. • The analysis of calculated results validates the theoretical derivation. • Flow characteristics of highly loaded helium compressor blade profile are computed. - Abstract: Helium compressor is a major component of the Power Conversion Unit (PCU) used in a High Temperature Gas Cooled Reactor (HTGR). Because the high cost of closed cycle test and leakage problem of helium gas, air could be used as working fluid instead of helium in compressor performance tests. However, the properties of Helium are largely different from those of air, e.g. the adiabatic exponent of Helium is 1.6, while the adiabatic exponent itself is a criterion of similarity between the two compressors. The characteristics of compressor will be different due to the effect of the adiabatic exponent of working fluid, especially for highly loaded compressor working at higher inlet Mach number. In this paper, a theoretical study on the similarity between air compressor and a highly loaded helium compressor is carried out and the deviation of similarity is analyzed. Numerical simulations are then used to confirm the theoretical analysis. The results indicate that the similarity deviation could not be neglected for highly loaded compressor cascade, which means the experience and experimental results of those conventional air compressor cannot be applied directly to the design of highly loaded helium compressor. The flow characteristics of a highly loaded helium compressor at different Reynolds numbers, attack angles, Mach numbers and cascade geometries are then investigated

  20. Similarity and cascade flow characteristics of a highly loaded helium compressor

    Energy Technology Data Exchange (ETDEWEB)

    Jiang, Bin, E-mail: jiangbin_hrbeu@163.com [College of Power & Energy Engineering of Harbin Engineering University, Harbin 150001 (China); Chen, Zhongliang [College of Power & Energy Engineering of Harbin Engineering University, Harbin 150001 (China); Chen, Hang [AVIG Shenyang Engine Design and Research Institute, Shenyang 110015 (China); Zhang, Hai; Zheng, Qun [College of Power & Energy Engineering of Harbin Engineering University, Harbin 150001 (China)

    2015-05-15

    Highlights: • The deviation of different similarity criteria is analyzed theoretically. • Flow difference between helium and air compressor cascades is analyzed numerically. • The analysis of calculated results validates the theoretical derivation. • Flow characteristics of highly loaded helium compressor blade profile are computed. - Abstract: Helium compressor is a major component of the Power Conversion Unit (PCU) used in a High Temperature Gas Cooled Reactor (HTGR). Because the high cost of closed cycle test and leakage problem of helium gas, air could be used as working fluid instead of helium in compressor performance tests. However, the properties of Helium are largely different from those of air, e.g. the adiabatic exponent of Helium is 1.6, while the adiabatic exponent itself is a criterion of similarity between the two compressors. The characteristics of compressor will be different due to the effect of the adiabatic exponent of working fluid, especially for highly loaded compressor working at higher inlet Mach number. In this paper, a theoretical study on the similarity between air compressor and a highly loaded helium compressor is carried out and the deviation of similarity is analyzed. Numerical simulations are then used to confirm the theoretical analysis. The results indicate that the similarity deviation could not be neglected for highly loaded compressor cascade, which means the experience and experimental results of those conventional air compressor cannot be applied directly to the design of highly loaded helium compressor. The flow characteristics of a highly loaded helium compressor at different Reynolds numbers, attack angles, Mach numbers and cascade geometries are then investigated.

  1. Cold Climate Heat Pumps Using Tandem Compressors

    Energy Technology Data Exchange (ETDEWEB)

    Shen, Bo [ORNL; Abdelaziz, Omar [ORNL; Rice, C Keith [ORNL; Baxter, Van D [ORNL

    2016-01-01

    In cold climate zones, e.g. ASHRAE climate regions IV and V, conventional electric air-source heat pumps (ASHP) do not work well, due to high compressor discharge temperatures, large pressure ratios and inadequate heating capacities at low ambient temperatures. Consequently, significant use of auxiliary strip heating is required to meet the building heating load. We introduce innovative ASHP technologies as part of continuing efforts to eliminate auxiliary strip heat use and maximize heating COP with acceptable cost-effectiveness and reliability. These innovative ASHP were developed using tandem compressors, which are capable of augmenting heating capacity at low temperatures and maintain superior part-load operation efficiency at moderate temperatures. Two options of tandem compressors were studied; the first employs two identical, single-speed compressors, and the second employs two identical, vapor-injection compressors. The investigations were based on system modeling and laboratory evaluation. Both designs have successfully met the performance criteria. Laboratory evaluation showed that the tandem, single-speed compressor ASHP system is able to achieve heating COP = 4.2 at 47 F (8.3 C), COP = 2.9 at 17 F (-8.3 C), and 76% rated capacity and COP = 1.9 at -13 F (-25 C). This yields a HSPF = 11.0 (per AHRI 210/240). The tandem, vapor-injection ASHP is able to reach heating COP = 4.4 at 47 F, COP = 3.1 at 17 F, and 88% rated capacity and COP = 2.0 at -13 F. This yields a HSPF = 12.0. The system modeling and further laboratory evaluation are presented in the paper.

  2. Compressor map prediction tool

    Science.gov (United States)

    Ravi, Arjun; Sznajder, Lukasz; Bennett, Ian

    2015-08-01

    Shell Global Solutions uses an in-house developed system for remote condition monitoring of centrifugal compressors. It requires field process data collected during operation to calculate and assess the machine's performance. Performance is assessed by comparing live results of polytropic head and efficiency versus design compressor curves provided by the Manufacturer. Typically, these design curves are given for specific suction conditions. The further these conditions on site deviate from those prescribed at design, the less accurate the health assessment of the compressor becomes. To address this specified problem, a compressor map prediction tool is proposed. The original performance curves of polytropic head against volumetric flow for varying rotational speeds are used as an input to define a range of Mach numbers within which the non-dimensional invariant performance curve of head and volume flow coefficient is generated. The new performance curves of polytropic head vs. flow for desired set of inlet conditions are then back calculated using the invariant non-dimensional curve. Within the range of Mach numbers calculated from design data, the proposed methodology can predict polytropic head curves at a new set of inlet conditions within an estimated 3% accuracy. The presented methodology does not require knowledge of detailed impeller geometry such as throat areas, blade number, blade angles, thicknesses nor other aspects of the aerodynamic design - diffusion levels, flow angles, etc. The only required mechanical design feature is the first impeller tip diameter. Described method makes centrifugal compressor surveillance activities more accurate, enabling precise problem isolation affecting machine's performance.

  3. Experimental Testing of an Oil-Flooded Hermetic Scroll Compressor

    OpenAIRE

    Bell, Ian; Groll, Eckhard; Braun, James; W. Travis, Horton

    2013-01-01

    In this work, a residential air conditioning compressor designed for vapor injection has been modified in order to inject large quantities of oil into the working chamber in order to approach an isothermal compression process. The compressor was tested with oil injection mass flow fractions of up to 45%. At an evaporating temperature of -10C and condensing temperature of 30C, the overall isentropic efficiency was up to 70% at the highest oil injection rate. Overall, over the testing envelo...

  4. Experimental Testing of Oil-Flooded Hermetic Scroll Compressor

    OpenAIRE

    Bell, Ian H.; Eckhard A. Groll; Braun, James E.; Horton, W. Travis

    2012-01-01

    In this work, a residential air conditioning compressor designed for vapor injection has been modified in order to inject large quantities of oil into the working chamber in order to approach an isothermal compression process. For a range of different oil injection scenarios, the result is a monotonic decrease in compressor discharge temperature as the oil injection rate is increased. In addition, the pumped refrigerant mass flow rate tends to increase as the oil injection rate is increased.

  5. Equivalent Linkages of Compressor Mechanisms

    OpenAIRE

    Bukac, Hubert

    2014-01-01

    Frequently, the dynamics of a compressor’s mechanism can be simplified and better understood by analyzing compressor’s equivalent linkage. Although the equivalent linkage of a reciprocating piston compressor is well known, the equivalent linkages of other types of compressors are not. For example, it is not well understood that the equivalent linkage of a rolling piston compressor is also the same slider-crank mechanism as the one of a reciprocating piston compressor. The difference between r...

  6. Electrochemical Hydrogen Compressor

    Energy Technology Data Exchange (ETDEWEB)

    Lipp, Ludwig [FuelCell Energy, Inc., Torrington, CT (United States)

    2016-01-21

    Conventional compressors have not been able to meet DOE targets for hydrogen refueling stations. They suffer from high capital cost, poor reliability and pose a risk of fuel contamination from lubricant oils. This project has significantly advanced the development of solid state hydrogen compressor technology for multiple applications. The project has achieved all of its major objectives. It has demonstrated capability of Electrochemical Hydrogen Compression (EHC) technology to potentially meet the DOE targets for small compressors for refueling sites. It has quantified EHC cell performance and durability, including single stage hydrogen compression from near-atmospheric pressure to 12,800 psi and operation of EHC for more than 22,000 hours. Capital cost of EHC was reduced by 60%, enabling a path to meeting the DOE cost targets for hydrogen compression, storage and delivery ($2.00-2.15/gge by 2020).

  7. Hyperbolically Shaped Centrifugal Compressor

    Institute of Scientific and Technical Information of China (English)

    Romuald Puzyrewski; Pawel Flaszy(n)ski

    2003-01-01

    Starting from the classical centrifugal compressor, cone shaped in meridional cross section, two modifications are considered on the basis of results from 2D and 3D flow models. The first modification is the change of the meridional cross section to hyperbolically shaped channel. The second modification, proposed on the basis of 2D axisymmetric solution, concerns the shape of blading. On the strength of this solution the blades are formed as 3D shaped blades, coinciding with the recent tendency in 3D designs. Two aims were considered for the change of meridional compressor shape. The first was to remove the separation zone which appears as the flow tums from axial to radial direction. The second aim is to uniformize the flow at exit of impeller. These two goals were considered within the frame of 2D axisymmetric model. Replacing the cone shaped compressor by a hyperbolically shaped one, the separation at the corner was removed. The disc and shroud shape of the compressor was chosen in the way which satisfies the condition of most uniform flow at the compressor exit. The uniformity of exit flow from the rotor can be considered as the factor which influences the performance of the diffuser following the rotor. In the 2D model a family of stream surfaces of S1 type is given in order to find S2 surfaces which may be identified with the midblade surfaces of compressor blading. A computation of 3D type has been performed in order to establish the relations between 2D and 3D models in the calculation of flow parameters. In the presented example the 2D model appears as the inverse model which leads to 3D shape of blading whereas the 3D model has been used for the direct solution. In the presented example the confrontation of two models, 2D and 3D, leads to a better understanding of the application of these models to the design procedure.

  8. Study on an Oscillating Rod Restrained Oil--free Lubrication Reciprocating Piston Air Compressor%摆杆约束往复活塞式无油润滑空气压缩机的研究

    Institute of Scientific and Technical Information of China (English)

    耿葵花; 耿爱农; 李辛沫; 陈君立; 阮勤江

    2012-01-01

    A new oil--free--reciprocating piston air compressor was proposed. In the new type of compressor, an oscillating rod mechanism was used to ensure the connecting rod and piston working in closely straight reciprocating motion, so that the knocking and side pressure between the cylinder and the piston were decreased significantly. Compared with traditional compressor, the height of the new compressor is reduced by 24% while the noise and friction power are decreased by 7.4% and ldB (A) respectively and the seal ring lifetime is increased by about 10%. A mathematic model was established and the operation characteristics of the oscillating rod were analyzed. The theoretical studies show that the swing amplitude of the piston and seal ring are decreased significantly and the knocking strength and side pressure of cylinder wall are reduced because of the restriction of the oscillating rod, and that the rod's loading condition can be improved by setting the mechanism's quick-return trip correspondence to the compressor's suction stroke.%提出一种新型往复活塞式无油润滑空气压缩机,在传统曲柄连杆机构的基础上增设一个摆杆机构,以此约束连杆和活塞以近乎直线往复的方式进行工作,从而缓解活塞及密封环对气缸的侧压力与敲击强度。与传统机型相比较,新型压缩机摩擦功减小了7.4%,噪声下降约1dB(A),密封环寿命提高约10%,高度降低24%。建立了新型压缩机的数学模型,对其摆杆约束机构的特性进行了分析。研究表明:增设摆杆可以大幅度地减小活塞及密封环相对于气缸的摆动幅度,有利于降低它们对气缸的侧压力和敲击强度;另外,曲柄的运转方向对摆杆机构的运动学特性和动力学特性影响较为明显,将机构的急回行程与压缩机的进气行程呼应设置有利于改善摆杆的受力状况。

  9. Shaking and Balance of a Convertible One- and Two-Cylinder Reciprocating Compressor

    OpenAIRE

    Ong, Chin Guan

    2000-01-01

    This research involves the study of a one- and two-cylinder convertible reciprocating Freon compressor for air conditioning or refrigeration purposes. The main concern is the reduction of the vibration (noise) caused during the operation of the compressor. Vibration is a main concern when the compressor is shifted from the one-cylinder operation to the two-cylinder operation mode and the reverse of this shift. The objectives for this research are (1) to investigate the shaking force due t...

  10. EXPERIMENTAL INVESTIGATION OF PARAMETERS EFFECTING THE NOISE REDUCTION IN HERMITICALLY SEALED RECIPROCATING COMPRESSOR

    OpenAIRE

    G.Laxmaiah; Dr.P.Ravinder Reddy; M N S V Kiran Kumar

    2011-01-01

    Hermetic reciprocating compressors are most commonly used in the refrigeration industry. The main source of noise in refrigerating and air conditioning machinery is the compressor. Reduction of noise in compressors is a complex criterion as many factors such as Shell Thickness, Shell Material, Suction Port Area and Discharge Port Area etc. contribute its effect on the noise and they also interact in a complex manner. In this work a screening test is carried out to find the relative effect of ...

  11. Compressor reliability survey

    NARCIS (Netherlands)

    Eijk, A.; Lier, L.J. van

    2010-01-01

    The increasing demand for economic plant operation has led to a critical discussion of the equipment as to selection, design, maintenance and automation. The well-known advantages of the reciprocating compressor such as high efficiency under many different operating conditions, comparatively easy re

  12. Compressor health monitoring toolkit

    Energy Technology Data Exchange (ETDEWEB)

    Harrell, John Jr.; Harris, Ralph E.; Smalley, Anthony J. [Southwest Research Institute (United States)

    2002-04-01

    Techniques for monitoring large engines and compressors are described under the following headings: lube oil analysis with particle counting; bearing temperature prediction; crankshaft web deflection measurement; crankshaft bending stress prediction; direct crankshaft strain measurement; shaft torque measurements; and operational deflection shape. (UK)

  13. Study on Variable Volume and Gas Injection DC Inverter Air Conditioner Compressor%变频变容喷气增焓空调压缩机的理论与实验研究

    Institute of Scientific and Technical Information of China (English)

    向卫民

    2016-01-01

    The lower heating capacity in low ambient temperature is the defect of the air-conditioner. Some schemes have been proposed to solve the problem, but they can't improve the quantity of heat more than 50%in low ambient tem-perature and improve efficiency in general temperature at the same time. This paper proposes a vapor-injection varicap compressor, and studies its heating capacity and efficiency properties. The experimental results show that the APF of the air-conditioner increased by 6%when using the vapor-injection varicap compressor, and the quantity of heat increased by 85%, at the same time.%低温制热能力不足问题一直是空调的诟病,研发人员在前期也提出过几种解决温制热量的方案,但都以难满足APF工况下的能效提升和低温-15℃环境温度下高制热量的两个目标。针对这一难题,提出一种集变频技术、变容技术和喷气增焓技术为一体的压缩机设计方案,通过原理分析进行了样机的结构设计,研究其性能及低温能力特性,经验证,搭载空调系统测试时,喷气能力能效提升效果明显,在喷气情况下,搭载系统APF比基准机型提高了约6%,同时,搭载系统的低温-15℃的制热能力相对基准机提升了约85%,效果显著。

  14. Cause Analysis and Preventive Measures for Suddenly Opening Blow off Valve of Multi-Shaft Centrifugal Air Compressor%多轴离心式空压机放空阀突然打开的原因分析及防范措施

    Institute of Scientific and Technical Information of China (English)

    邵士铭; 张锡德; 辜兴春

    2012-01-01

    中国石油天然气股份有限公司塔里木油田石化分公司45万t/a合成氨装置的工艺空气压缩机采用德国AtlasCopco公司的多轴离心式压缩机。简述了该压缩机的工艺流程和控制原理;分析了该压缩机运行时放空阀突然打开并导致二段炉断空气的事故原因;提出了调整操作指标和改进操作方法的防范措施。结果表明,当合成氨装置的负荷由100%减至70%时,严格执行新的操作规定,未发生压缩机放空阀打开的事故。%Multi-shaft centrifugal compressor made by Germany Atlas Copso Company has been used as process air compressor in ammonia synthesis plant with a capacity of 450,000 t/a in Talimu Oil Field Petro-chemical Sub-company, China Petroleum and Natural Gas Stock Company Ltd. , author has briefly described the process flow, and control principle for this compressor; has analyzed the reason of accident that the blow off valve was suddenly opened during running of this compressor and therefore induced to cut off the air flow of the secondary reformer; has presented the preventive measures to adjust operating index and to improve operating method. Result indicates while the load of ammonia synthesis plant is reduced from 100% to 70 % , if the operating stipulation is strictly obeyed, no accident occurs due to opening the blow off vale of this compressor.

  15. Analyses of the Integration of Carbon Dioxide Removal Assembly, Compressor, Accumulator and Sabatier Carbon Dioxide Reduction Assembly

    Science.gov (United States)

    Jeng, Frank F.; Lafuse, Sharon; Smith, Frederick D.; Lu, Sao-Dung; Knox, James C.; Campbell, Mellssa L.; Scull, Timothy D.; Green Steve

    2010-01-01

    A tool has been developed by the Sabatier Team for analyzing/optimizing CO2 removal assembly, CO2 compressor size, its operation logic, water generation from Sabatier, utilization of CO2 from crew metabolic output, and Hz from oxygen generation assembly. Tests had been conducted using CDRA/Simulation compressor set-up at MSFC in 2003. Analysis of test data has validated CO2 desorption rate profile, CO2 compressor performance, CO2 recovery and CO2 vacuum vent in CDRA desorption. Optimizing the compressor size and compressor operation logic for an integrated closed air revitalization system Is being conducted by the Sabatier Team.

  16. TM600-2型离心式空气压缩机喘振故障分析及解决措施研究%Study on the Cause of TM600-2 Centrifugal Air Compressor Surge and Scheme to Solve the Problem

    Institute of Scientific and Technical Information of China (English)

    侯建

    2013-01-01

      离心式压缩机是生产过程中十分重要的设备,解决离心式压缩机运行的质量和效率具有重要意义。笔者通过对日常工作的总结,分析了TM600-2型离心式空气压缩机喘振故障原因,并提出了几点自己关于解决改故障的方案,实践证明很好地改善了喘振的问题。%Centrifugal air compressor is very important in the production process, so it is of great significance to solve its problem of quality and efficiency. Through the summary of the day-to-day work, the author analyzed the cause of TM600-2 centrifugal air compressor surge, and put forward a few of own schemes to solve the problem, and practice has proved that it well improved the surge of TM600-2 centrifugal air compressor.

  17. 永磁无刷直流电动机在微型空压机中的应用%Application of Permanent Magnet Brushless DC Motor in Miniature Air Compressor

    Institute of Scientific and Technical Information of China (English)

    凌永骧; 张华宗; 余仁田

    2013-01-01

    Compared with the traditional DC motor and induction motor,permanent magnet brushless DC(BLDC) motor has more superior performance,widely used in many fields,and has a tendency to gradually replace other motors.In this paper,the development and application of permanent magnet brushless DC motor in the miniature air compressor are analyzed.%永磁无刷直流电动机(简称BLDC)与传统的直流电机及感应电动机相比,永磁无刷直流电动机具有更多优越的性能,在许多领域得到了广泛应用,有逐步取代其它电动机的趋势.本文对永磁无刷直流电动机在微型空压机中的应用和发展情况进行分析.

  18. Application of OxidationAir Compressor in Flue Gas Desulfurization Engineering in Power Plant%浅析氧化风机在电厂烟气脱硫工程中的应用

    Institute of Scientific and Technical Information of China (English)

    田晓曼

    2012-01-01

      作为整个脱硫运行中比较关键的大型设备,氧化风机的选型是否合理,直接关系整个工程的投资及运营。本文从罗茨鼓风机和离心鼓风机各自的工作原理和特点分析了两种风机在实际脱硫工程中的优缺点,同时在风机效率、噪声大小及风机传动设施方面进行了比较说明。%  As a key equipment in al flue gas desulfurization engineering, the selection of oxidation air compressor shows a direct bearing on the investment and operation in project. The paper explicates the concept of the working principle and char-acteristics and analyzes the advantages and disadvantages on the areas of fan efficiency, noise and transmission facilities of the Root`s blower and centrifugal blower.

  19. Performance in Centrifugal Compressors

    Directory of Open Access Journals (Sweden)

    K. Sato

    1999-01-01

    Full Text Available A 3-D unsteady thin-layer Navier-Stokes code has been used to calculate the flow through a centrifugal compressor stage. The validation of the code for steady flows in centrifugal compressors was conducted for the Krain’s impeller with a vaneless diffuser as a test case and the numerical results were compared with the experimental results. The predicted flow field and performance agreed well with the experimental data. An unsteady stage solution was then conducted with this impeller followed by a generic low-solidity vaned-diffuser to examine the unsteady effects on the impeller performance. The computational results showed a stabilising effect of the blade row interaction.

  20. Gas path diagnostics for compressors

    OpenAIRE

    Salamat, Reza

    2012-01-01

    The use and application of compressors cannot be overemphasized in the aeronautical and oil & gas industries. Yet research works in sufficient depth has not been conducted previously to analyze their actual behaviour under degraded or even new conditions in operation. For the purpose of degradation modeling and simulation, a compressor model was set up using thermodynamic equations and affinity laws representing the characteristics of a clean compressor. HYSYS was used for degradation mode...

  1. Cooling system at the compressors air inlet of the gas turbines from the Tula`s combined cycle central; Sistema de enfriamiento en la succion del compresor de las turbinas de gas de la central de ciclo combinado de Tula

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez F, Oscar [Comision Federal de Electricidad, Tula (Mexico); Romero Paredes, Hernando; Vargas, Martin; Gomez, Jose Francisco [Universidad Autonoma Metropolitana-Iztapalapa, Mexico, D. F. (Mexico)

    1996-12-31

    It has been formerly evaluated that it is possible to enhance notably the electric power generation in gas turbine power plants by cooling the air at the compressor inlet. It has been pointed out that provided a source of waste heat is available it can be very attractive the use of absorption refrigeration systems. In this paper the technical and the economical benefits of bringing the air inlet temperature down 8 Celsius degrees of the four gas turbines of the Combined Cycle Central of Tula, in the State of Hidalgo (combined cycle central-Tula) are evaluated. The results show that it is possible to achieve an efficiency enhancement of at least 1%, and that in very warm days up to 48 additional Megawatts can be generated, or about 10% of the installed capacity. The final economic result is very encouraging and an annual economical benefit in the order of 50 million pesos can be obtained and the refrigeration units can be amortized in approximately one year. [Espanol] Se ha evaluado anteriormente que es posible mejorar notablemente la capacidad de generacion electrica en plantas que utilizan turbinas de gas, mediante el enfriamiento del aire de succion del compresor. Se ha senalado que en la medida en que se encuentre disponible una fuente termica de desecho puede ser muy atractivo el uso de sistemas de refrigeracion por absorcion. En el presente trabajo se evaluan los beneficios tecnicos y economicos que puede tener el llevar el aire de succion hasta una temperatura de 8 grados Celsius, de las cuatro unidades de gas de la Central de Ciclo Combinado de Tula, Hidalgo (CCC-Tula). Los resultados muestran que es posible alcanzar un aumento en la eficiencia de al menos 1% y que se pueden generar, en dias muy calurosos, hasta 48 MW extras, equivalente al 10% de la capacidad instalada. El resultado economico final es muy alentador y puede llegar a tenerse un beneficio economico del orden de los 50 millones de pesos anuales y las unidades de refrigeracion podran pagarse en

  2. A New Type of Underground Air Compressor Artificial Refrigeration System%一种井下新型空气压缩人工制冷系统

    Institute of Scientific and Technical Information of China (English)

    任森

    2012-01-01

    以工程热力学与传热学的理论为基础,结合并下实际情况提出一种新型人工制冷系统.该制冷系统由一套空气压缩制冷装置及换热水袋组成,袋内有蛇形布置的空气管,工质空气在管内流动,并借助其他制冷装置完成工作循环.巷道围岩上覆盖一层保温隔热材料,换热水袋安装在这层保温材料之上.该系统不仅能通过井下风流与换热水袋的对流换热降低风流温度,而且有效阻隔了围岩散热,并将高温围岩与人体间的辐射换热转变成低温的换热水袋与人体间的辐射换热,因此制冷效果更好.制冷工质空气本身廉价且无毒害.%A new type of artificial refrigeration system is proposed based on engineering thermodynamics and heat transfer theory,it combined with the actual situation of underground mine. The cooling system consists of a set of air-compression refrigeration device and many heat exchanger hydrations. There is an air pipe in the hydration in serpentine way,and air flows in the pipe,with other cooling device to complete the work cycle. Surrounding rock covered by a layer of thermal insulation materials,and the heat exchanger hydrations installed on the top of this layer of insulation material. The system not only reduces the airflow temperature through convective heat transfer between underground airflow and the heat exchanger hydrations,but also effective barrier surrounding rock heat Change radioactive heat transfer between the high-temperature surrounding rock and the human bodies into radioactive heat transfer between the low temperature heat exchanger hydrations and the human bodies. Therefore,the cooling effect is good. Refrigerant air itself is cheap and non-toxic.

  3. Centrifugal-reciprocating compressor

    Science.gov (United States)

    Higa, W. H. (Inventor)

    1984-01-01

    A centrifugal compressor is described which includes at least one pair of cylinders arranged in coaxial alignment and supported for angular displacement about a common axis of rotation normally disecting a common longitudinal axis of symmetry for the cylinders. The cylinders are characterized by ported closures located at the mutually remote ends thereof through which the cylinders are charged and discharged, and a pair of piston heads seated within the cylinders and supported for floating displacement in compressive strokes in response to unidirectional angular displacement imparted to the cylinders.

  4. Practical experience with unstable compressors

    Science.gov (United States)

    Malanoski, S. B.

    1980-01-01

    Using analytical mathematical modeling techniques for the system components, an attempt is made to gauge the destabilizing effects in a number of compressor designs. In particular the overhung (or cantilevered) compressor designs and the straddle-mounted (or simply supported) compressor designs are examined. Recommendations are made, based on experiences with stable and unstable compressors, which can be used as guides in future designs. High and low pressure compressors which operate well above their fundamental rotor-bearing lateral natural frequencies can suffer from destructive subsynchronous vibration. Usually the elements in the system design which contribute to this vibration, other than the shafting and the bearings, are the seals (both gas labyrinth and oil breakdown bushings) and the aerodynamic components.

  5. QRFXFreeze: Queryable Compressor for RFX.

    Science.gov (United States)

    Senthilkumar, Radha; Nandagopal, Gomathi; Ronald, Daphne

    2015-01-01

    The verbose nature of XML has been mulled over again and again and many compression techniques for XML data have been excogitated over the years. Some of the techniques incorporate support for querying the XML database in its compressed format while others have to be decompressed before they can be queried. XML compression in which querying is directly supported instantaneously with no compromise over time is forced to compromise over space. In this paper, we propose the compressor, QRFXFreeze, which not only reduces the space of storage but also supports efficient querying. The compressor does this without decompressing the compressed XML file. The compressor supports all kinds of XML documents along with insert, update, and delete operations. The forte of QRFXFreeze is that the textual data are semantically compressed and are indexed to reduce the querying time. Experimental results show that the proposed compressor performs much better than other well-known compressors. PMID:26065027

  6. Comparative Study of the Driving Mode of Air Compressor Unit of ASU in an IGCC Plant%用于IGCC电站空分系统空气压缩单元驱动方式的比较研究

    Institute of Scientific and Technical Information of China (English)

    穆延非; 史绍平; 闫姝; 陈新明; 周贤; 方芳

    2014-01-01

    在IGCC电站中,空气分离系统(空分系统)的能耗最高。如果能降低空分系统的能耗,将显著提高IGCC电站的供电效率。该文依托某IGCC示范电站,对IGCC电站独立空分系统空气压缩单元的2种驱动方式进行了分析比较,认为相比于电动机驱动方式,小型汽轮机驱动空气压缩单元的方式不仅有利于电站的启动,而且能使电站的供电效率提高0.47%,在低负荷工况下运行,提高的幅度会更加显著。为进一步提升电站经济效益,通过改造IGCC电站的余热锅炉,增加补燃装置,使其可以在空分系统启动时为小型汽轮机提供启动蒸汽,从而大大降低电站的初期投资。%ABSTRACT:The energy consumption of the air separation unit (ASU) in the integrated gasification combined cycle (IGCC) plant dominates the overall auxiliary power usage. Reducing the energy consumption of the ASU will greatly reduce the power consumption rate of the IGCC plant thus dramatically increasing the IGCC efficiency. Using a commercialized IGCC demonstration power plant as an example, a comprehensively comparative analysis was conducted for an isolated air separation unit. The results show that using a small steam turbine as the driving force for the air compressor unit of ASU has clear advantage over electric motor, since it is not only convenient for start-up but also more efficient in power generation. It may increase the power output efficiency by 0.47%. When operated at a lower load, the efficiency increase will be even higher. If the technology of supplementary fired heat recovery boiler is used in the heat recovery steam generator (HRSG) to provide the necessary steam for the ASU steam turbine during start-up, the initial investment will be reduced.

  7. 空压机压力控制系统建模与动态特性研究%Research on System Modeling and Dynamic Characteristics of Air Compressor Pressure Control System

    Institute of Scientific and Technical Information of China (English)

    赵前程; 戴巨川; 覃业军; 袁贤松

    2013-01-01

    The gas supply system of screw type air compressor is researched in this paper.Based on the analysis of system composition, the air compressor pressure control system is divided into the gas tank sub-system, motor sub-system and pressure control sub-system.In the gas tank sub-system,the P-V-T relationship is described using real gas equation of state (Van Derwal equation);in the motor sub-system,three phase induction motor rotor field oriented control model is employed;the pressure control sub-system is three closed-loop control structure of current feedback, velocity feedback and pressure feedback (variable frequency control).The numerical simulation analyses are carried out both under variable frequency mode and normal load/unload mode.The research results show that using the constructed variable frequency strategy,the system has good dynamic,static performance which means that the motor speed can adjust automatically to assure the gas pressure near a given value according to the variation of gas consumption.Under normal load/unload mode,the gas pressure fluctuates in the range of pmin~Pmax;in occasions with large variation of gas consumption,not only the motor start and stop frequently, but also the pressure fluctuation significantly increases.%以螺杆式空压机供气系统为研究对象,在对其系统组成分析基础上,将空压机压力控制系统划分为储气罐子系统、电机子系统、压力控制子系统.空压机储气罐子系统采用实际气体状态方程式描述储气罐中气体P-V-T关系(范德瓦尔方程式),电机子系统采用三相感应电机转子磁场定向控制模型,储气压力控制子系统为电流反馈、速度反馈和压力反馈的三闭环控制结构(电机变频控制).分别进行了电机变频控制和普通加、卸载控制模式下的数值仿真分析,结果表明对于文中构建的变频控制策略,系统具有良好的动、静态性能,能够根据用气量的变化自动调节转速

  8. NASA Glenn's Single-Stage Axial Compressor Facility Upgraded

    Science.gov (United States)

    Brokopp, Richard A.

    2004-01-01

    NASA Glenn Research Center's Single-Stage Axial Compressor Facility was upgraded in fiscal year 2003 to expand and improve its research capabilities for testing high-speed fans and compressors. The old 3000-hp drive motor and gearbox were removed and replaced with a refurbished 7000-hp drive motor and gearbox, with a maximum output speed of 21,240 rpm. The higher horsepower rating permits testing of fans and compressors with higher pressure ratio or higher flow. A new inline torquemeter was installed to provide an alternate measurement of fan and compressor efficiency, along with the standard pressure and temperature measurements. A refurbished compressor bearing housing was also installed with bidirectional rotation capability, so that a variety of existing hardware could be tested. Four new lubrication modules with backup capability were installed for the motor, gearbox, torquemeter, and compressor bearing housing, so that in case the primary pump fails, the backup will prevent damage to the rotating hardware. The combustion air supply line for the facility inlet air system was activated to provide dry air for repeatable inlet conditions. New flow conditioning hardware was installed in the facility inlet plenum tank, which greatly reduced the inlet turbulence. The new inlet can also be easily modified to accommodate 20- or 22-in.-diameter fans and compressors, so a variety of existing hardware from other facilities (such as Glenn's 9- by 15-Foot Low-Speed Wind Tunnel) can be tested in the Single-Stage Axial Compressor Facility. An exhaust line was also installed to provide bleed capability to remove the inlet boundary layer. To improve the operation and control of the facility, a new programmable logic controller (PLC) was installed to upgrade from hardwired relay logic to software logic. The PLC also enabled the usage of human-machine interface software to allow for easier operation of the facility and easier reconfiguration of the facility controls when

  9. 无油润滑空压机活塞连杆组件结构改进设计%Improved Design on the Piston-rod Assembly Structure of the Oil-free Lubricating Air Compressor

    Institute of Scientific and Technical Information of China (English)

    耿爱农; 李辛沫; 陈君立; 阮勤江

    2011-01-01

    In view of the current existing defects of the piston-rod assembly for the wobble piston oil-free lubricating air compressor, the article presents the design improvements, including the fastening means of the piston cover,assembly structure of bearing for the connect rod and so on,which eliminate the hidden dangers that the piston cover loose by using expansion bolt fastening way instead of the original way of screw thread fastening.The loose proof and anti-rotating ability of the piston cover are enhanced by using offsetting screw fastening instead of the original way of center screw fastening, and the working life of the connect rod bearing is effectively improved by using heating fastening bearing way instead of the original way of screw fastening bearing.%针对当前摇摆活塞式无油润滑空压机活塞连杆组件存在的一些缺陷提出改进设计,包括活塞盖板的紧固方式、连杆大头轴承的装配结构等,通过采用膨胀栓紧固方式替代原来的螺钉螺纹紧固方式,消除了活塞盖板的松脱隐患.采用偏置螺钉紧固替代原来的正中螺钉紧固,增强了活塞盖板的防松转能力,采用完整轴承座孔,结合加热法紧固轴承替代原来的裂槽式轴承座孔结合螺钉紧固轴承,有效地提高了连杆大头轴承的使用寿命.

  10. INFLUENCE OF THE NETWORK GEOMETRY ON THE SURGECHARACTERISTICS OF A CENTRIFUGAL COMPRESSOR.

    OpenAIRE

    Toussaint, Michel; Elkamel, Chiheb

    2012-01-01

    International audience During the use of centrifugal compressor for turbocharging diesel engines, the compressor is connected to one circuit, more or less complex including capacities and lengths pipes (air filter, RAS : supercharger air cooler, bends, resonator…) These different network geometries have a very high influence on the « surge line » position (see figure 1), as well as on the surge loop (figure 2). Figure 1 Figure 2. This surge loop area (pressure ratio vs mass flow-rate fluct...

  11. Comparison and Selection of Centrifugal Compressor in Large Air Separation Plant%大型空分装置配套离心压缩机组的综合选评

    Institute of Scientific and Technical Information of China (English)

    邱水金; 朱俊豪

    2015-01-01

    With the comprehensive comparison of integrally geared centrifugal compressor and single shaft multistage compressor, including layout of machine set, type of driver, out contour size and space needed in workshop, and investment cost, for the feed alr tubo-compressor set and booster alr tubo-compressor set used in the large alr separation plant, it is determined that integrally geared centrifugal compressor should be selected in priority.%通过对多轴齿轮式多级离心式压缩机组和单轴多级离心式压缩机组的压缩机组型式、驱动机型式、外形尺寸和厂房空间需求、投资费用等方面的综合技术选评比较可知,本次4.2万系列空分项目所选用的原料空压机组和增压机组,应优先选用多轴齿轮式多级离心压缩机组。

  12. Hermetic compressor and block expansion valve in refrigeration performance

    Science.gov (United States)

    Santoso, Budi; Susilo, Didik Djoko; Tjahjana, D. D. D. P.

    2016-03-01

    Vehicle cabin in tropical countries requires the cooling during the day for comfort of passengers. Air conditioning machine is commonly driven by an internal combustion engine having a great power, which the conventional compressor is connected to crank shaft. The stage of research done is driving the hermetic compressor with an electric motor, and using block expansion valve. The HFC-134a was used as refrigerant working. The primary parameters observed during the experiment are pressure, temperature, and power consumption for different cooling capacities. The results show that the highest coefficient of performance (COP) and the electric power of system are 6.3 and 638 Watt, respectively.

  13. Compressor performance aerodynamics for the user

    CERN Document Server

    Gresh, Theodore

    2001-01-01

    Compressor Performance is a reference book and CD-ROM for compressor design engineers and compressor maintenance engineers, as well as engineering students. The book covers the full spectrum of information needed for an individual to select, operate, test and maintain axial or centrifugal compressors. It includes basic aerodynamic theory to provide the user with the ""how's"" and ""why's"" of compressor design. Maintenance engineers will especially appreciate the troubleshooting guidelines offered. Includes many example problems and reference data such as gas propert

  14. Empirical Design Considerations for Industrial Centrifugal Compressors

    OpenAIRE

    Cheng Xu; Amano, Ryoichi S.

    2012-01-01

    Computational Fluid Dynamics (CFD) has been extensively used in centrifugal compressor design. CFD provides further optimisation opportunities for the compressor design rather than designing the centrifugal compressor. The experience-based design process still plays an important role for new compressor developments. The wide variety of design subjects represents a very complex design world for centrifugal compressor designers. Therefore, some basic information for centrifugal design is still ...

  15. Characterization of Multiflux Axial Compressors

    International Nuclear Information System (INIS)

    In the present work the results of analytical models of performance are compared with experimental data acquired in the multi flux axial compressor test facility, built in The Pilcaniyeu Technological Complex for the SIGMA project.We describe the experimental circuit and the data of the dispersion inside the axial compressor obtained using a tracer gas through one of the annular inlets.The attained results can be used to validate the design code for the multi flux axial compressors and SIGMA industrial plant

  16. Electrochemical Hydrogen Compressor

    Energy Technology Data Exchange (ETDEWEB)

    David P. Bloomfield; Brian S. MacKenzie

    2006-05-01

    The Electrochemical Hydrogen Compressor EHC was evaluated against DOE applications for compressing hydrogen at automobile filling stations, in future hydrogen pipelines and as a commercial replacement for conventional diaphragm hydrogen compressors. It was also evaluated as a modular replacement for the compressors used in petrochemical refineries. If the EHC can be made inexpensive, reliable and long lived then it can satisfy all these applications save pipelines where the requirements for platinum catalyst exceeds the annual world production. The research performed did not completely investigate Molybdenum as a hydrogen anode or cathode, it did show that photoetched 316 stainless steel is inadequate for an EHC. It also showed that: molybdenum bipolar plates, photochemical etching processes, and Gortex Teflon seals are too costly for a commercial EHC. The use of carbon paper in combination with a perforated thin metal electrode demonstrated adequate anode support strength, but is suspect in promoting galvanic corrosion. The nature of the corrosion mechanisms are not well understood, but locally high potentials within the unit cell package are probably involved. The program produced a design with an extraordinary high cell pitch, and a very low part count. This is one of the promising aspects of the redesigned EHC. The development and successful demonstration of the hydraulic cathode is also important. The problem of corrosion resistant metal bipolar plates is vital to the development of an inexpensive, commercial PEM fuel cell. Our research suggests that there is more to the corrosion process in fuel cells and electrochemical compressors than simple, steady state, galvanic stability. It is an important area for scientific investigation. The experiments and analysis conducted lead to several recommended future research directions. First, we need a better understanding of the corrosion mechanisms involved. The diagnosis of experimental cells with titration to

  17. Dual capacity reciprocating compressor

    Science.gov (United States)

    Wolfe, Robert W.

    1984-01-01

    A multi-cylinder compressor 10 particularly useful in connection with northern climate heat pumps and in which different capacities are available in accordance with reversing motor 16 rotation is provided with an eccentric cam 38 on a crank pin 34 under a fraction of the connecting rods, and arranged for rotation upon the crank pin between opposite positions 180.degree. apart so that with cam rotation on the crank pin such that the crank throw is at its normal maximum value all pistons pump at full capacity, and with rotation of the crank shaft in the opposite direction the cam moves to a circumferential position on the crank pin such that the overall crank throw is zero. Pistons 24 whose connecting rods 30 ride on a crank pin 36 without a cam pump their normal rate with either crank rotational direction. Thus a small clearance volume is provided for any piston that moves when in either capacity mode of operation.

  18. 某型动车组空气压缩机保护电路优化设计探讨%Discussion of the Optimization Design of the Protective Electrical Circuit in the Air Compressor for a Certain Type of Multiple Units

    Institute of Scientific and Technical Information of China (English)

    于建功

    2012-01-01

    In view of the bur.ning damage of the driving motor and power supply Circuit breaker in the air compressor occurred in testing of a certain type of multiple units, the causes are analyzed, and the suggestion for design optimization is given.%针对某型动车组在试验过程中发生的空气压缩机驱动电机和电源断路器烧损的问题进行了原因分析,并提出了优化设计建议.

  19. 影响甲醇新鲜气压缩机长周期运行的原因分析及对策%Analysis of the Influencing Reason for the Long-time Operating of Methanol Fresh Air Compressor and Countermeasures

    Institute of Scientific and Technical Information of China (English)

    王哲; 王军; 曹云飞; 韩军; 张涛

    2012-01-01

    通过对新鲜气压缩机运行初期故障原因分析,提出了降低事故频率,延长运行周期的处理措施,从而保证了压缩机长周期良好运行,并取得了一定的经济效益.%Based on analyzing the fault reason at the early operating period of fresh air compresor,the treatment measures of lowering fault frequency and prolonging operation cycle are pointed out. So it ensures a good longtime operating of compressor and makes a certain economic benefits.

  20. Centrifugal compressor design choices for chillers

    Energy Technology Data Exchange (ETDEWEB)

    Brasz, J.J. [United Technologies Carrier, New York, NY (United States)

    1999-07-01

    The use of centrifugal compressors in the air conditioning and refrigeration industry is currently limited to large water cooled chillers varying in size from about 0.5 to 6 MW cooling capacity. These systems are primarily used for comfort or process cooling applications. All systems try to chill relatively large amounts of indoor or process water by a few degrees Celsius in a refrigerant evaporator. The heat removed from the chilled water is released together with the heat of compression in a refrigerant condenser to cooling tower water, from where it is discharged to the atmosphere. Different centrifugal compressor design concepts are used by the various chiller manufacturers: single-stage versus multi-stage, vaneless versus vaned diffuser, hermetic versus open-drive motors, shrouded versus open impellers, fixed versus variable diffuser geometry, low- versus high-pressure refrigerant. This variability seems strange for a mature industry like the air conditioning and refrigeration industry. This paper will show that the reason for this variability is the product compromise between the various conflicting system requirements with respect to size, cost, efficiency and refrigerant choice. The different system applications of the chillers (e.g. comfort cooling in a equatorial region versus process cooling in a moderate climate zone) play another major role in selecting an optimal centrifugal compression concept. Some general recommendations will be given for applications where a clear choice can be made. (Author)

  1. Flow Integrating Section for a Gas Turbine Engine in Which Turbine Blades are Cooled by Full Compressor Flow

    Energy Technology Data Exchange (ETDEWEB)

    Steward, W. Gene

    1999-11-14

    Routing of full compressor flow through hollow turbine blades achieves unusually effective blade cooling and allows a significant increase in turbine inlet gas temperature and, hence, engine efficiency. The invention, ''flow integrating section'' alleviates the turbine dissipation of kinetic energy of air jets leaving the hollow blades as they enter the compressor diffuser.

  2. Compressor bleed cooling fluid feed system

    Science.gov (United States)

    Donahoo, Eric E; Ross, Christopher W

    2014-11-25

    A compressor bleed cooling fluid feed system for a turbine engine for directing cooling fluids from a compressor to a turbine airfoil cooling system to supply cooling fluids to one or more airfoils of a rotor assembly is disclosed. The compressor bleed cooling fluid feed system may enable cooling fluids to be exhausted from a compressor exhaust plenum through a downstream compressor bleed collection chamber and into the turbine airfoil cooling system. As such, the suction created in the compressor exhaust plenum mitigates boundary layer growth along the inner surface while providing flow of cooling fluids to the turbine airfoils.

  3. A Blast of Cool Air

    Science.gov (United States)

    2000-01-01

    Unable to solve their engineering problem with a rotor in their Orbital Vane product, DynEco Corporation turned to Kennedy Space Center for help. KSC engineers determined that the compressor rotor was causing a large concentration of stress, which led to cracking and instant rotor failure. NASA redesigned the lubrication system, which allowed the company to move forward with its compressor that has no rubbing parts. The Orbital Vane is a refrigerant compressor suitable for mobile air conditioning and refrigeration.

  4. Method of Matching Performance of Compressor Systems with that of Aircraft Power Sections

    Science.gov (United States)

    Bullock, Robert O.; Keetch, Robert C.; Moses, Jason J.

    1945-01-01

    A method is developed of easily determining the performance of a compressor system relative to that of the power section for a given altitude. Because compressors, reciprocating engines, and turbines are essentially flow devices, the performance of each of these power-plant components is presented in terms of similar dimensionless ratios. The pressure and temperature changes resulting from restrictions of the charge-air flow and from heat transfer in the ducts connecting the components of the power plant are also expressed by the same dimensionless ratios and the losses are included in the performance of the compressor. The performance of a mechanically driven, single-stage compressor in relation to the performance of a conventional air-cooled engine operating at sea-level conditions is presented as an example of the application of the method.

  5. Designing compressor installations for reliability

    Energy Technology Data Exchange (ETDEWEB)

    Greenfield, S.D.; Howes, B.C.; Robinson, A.; Eckert, W.

    2000-07-01

    The best approach to the design of a new centrifugal or reciprocating compressor that will ensure reliability, performance and maintenance of the equipment involves the use of analytical tools. One must understand the sources of the potential problems and consequences along with the availability of design services. At that point risk assessment can be performed. The objective is to keep pulsations, vibration levels and dynamic stresses low, so as to minimally impact on the performance and reliability and maintain control over costs. The consideration of forcing functions, natural frequencies, mode shapes and dynamic stiffness is essential, as they apply to rotor dynamics, torsional vibration, piping vibration, skid and foundation vibration. It also applies to the interaction of the piping geometry with pressure pulsations which can produce significant forces and stresses for both reciprocating and centrifugal compressors and lead to a decrease in performance. The authors described the considerations that help determine which analytical tool is best to develop a computer model that can be used to avoid problems. Three cases were introduced to better illustrate the advantages of adequate design modeling and optimization. Each case deals with a different problem: (1) a lateral critical and a structural resonance in a centrifugal compressor installation, (2) a piping failure in a reciprocating compressor installation, and (3) a torsional failure in a reciprocating compressor installation. 1 ref., 2 tabs., 3 figs.

  6. Empirical Design Considerations for Industrial Centrifugal Compressors

    Directory of Open Access Journals (Sweden)

    Cheng Xu

    2012-01-01

    Full Text Available Computational Fluid Dynamics (CFD has been extensively used in centrifugal compressor design. CFD provides further optimisation opportunities for the compressor design rather than designing the centrifugal compressor. The experience-based design process still plays an important role for new compressor developments. The wide variety of design subjects represents a very complex design world for centrifugal compressor designers. Therefore, some basic information for centrifugal design is still very important. The impeller is the key part of the centrifugal stage. Designing a highly efficiency impeller with a wide operation range can ensure overall stage design success. This paper provides some empirical information for designing industrial centrifugal compressors with a focus on the impeller. A ported shroud compressor basic design guideline is also discussed for improving the compressor range.

  7. A Semi-Empirical Prediction Model for the Discharge Line Temperature of Hermetic Compressors

    OpenAIRE

    Myszka, David; Guan, Chen; Murray, Andrew; Hodapp, Thomas

    2014-01-01

    Predicting the discharge line temperature (DLT) of air conditioning and refrigeration compressors is important to ensure sufficient lubricant properties and proper performance of components that are positioned in the exhaust stream. Understanding the DLT is also necessary for the design of waste heat recovery systems, which are of increasing interest. However, compressor performance information published by manufacturers does not typically include DLT values. Assumptions made in established t...

  8. Numerical simulation of radial compressor stages with seals and technological holes

    Directory of Open Access Journals (Sweden)

    Syka Tomáš

    2014-03-01

    Full Text Available Article describes numerical simulations of an air flow in radial compressor stages in the NUMECA CFD software. Four different radial compressor stages were solved in this article. During the tasks evaluating the stepped and straight impeller seals and technological holes influence on working characteristics and the flow field was observed. Also the CFD results comparison with results from the empiric design tool is described.

  9. Structure Analysis of a Turbocharger Compressor Wheel Using FEA

    Directory of Open Access Journals (Sweden)

    Shaik Mohammad Rafi

    2014-10-01

    Full Text Available When people talk about race cars or high-performance sports cars, the topic of turbochargers usually comes up. Turbochargers also appear on large diesel engines. A turbo can significantly boost an engine's horsepower without significantly increasing its weight, which is the huge benefit that makes turbos so popular. Turbochargers are a type of forced induction system. They compress the air flowing into the engine. The advantage of compressing the air is that it lets the engine squeeze more air into a cylinder, and more air means that more fuel can be added. Therefore, you get more power from each explosion in each cylinder. Here in this project we are designing the compressor wheel by using Pro-E and doing analysis by using FEA package. The main aim of the project is to increase the performance of the compressor wheel for this we are changing the material and also we are changing the existing design. By comparing the results we will get the best model from this data we suggests the design modifications to the company to improve the performance of the compressor wheel.

  10. Compressor Part II: Volute Flow Predictions

    Directory of Open Access Journals (Sweden)

    Yu-Tai Lee

    1999-01-01

    Full Text Available A numerical method that solves the Reynolds-averaged Navier-Stokes equations is used to study an inefficient component of a shipboard air-conditioning HCFC-124 compressor system. This high-loss component of the centrifugal compressor was identified as the volute through a series of measurements given in Part I of the paper. The predictions were made using three grid topologies. The first grid closes the connection between the cutwater and the discharge diffuser. The other two grids connect the cutwater area with the discharge diffuser. Experiments were performed to simulate both the cutwater conditions used in the predictions. Surface pressures along the outer wall and near the inlet of the volute were surveyed for comparisons with the predictions. Good agreements between the predicted results and the measurements validate the calculations. Total pressure distributions and flow stream traces from the prediction results support the loss distribution through the volute. A modified volute configuration is examined numerically for further loss comparison.

  11. Positive Displacement Compressor Technology for Refrigeration

    Science.gov (United States)

    Nagatomo, Shigemi

    Trends of compressor technologies for refrigerators, freezers and condensing units are presented in this paper. HFC refrigerants such as R134a and R404C are promising candidates as an altemative for R12. Performance of reciprocating and rotary compressors in the operation with R134A is described. In addition, compressor technologies such as efficiency improvement are described in the cases of reciprocating, rotary and scroll compressors.

  12. Investigation Of Compressor Heat Dispersion Model

    OpenAIRE

    Shi, Da; Tao, Hong; Yang, Min

    2014-01-01

    This paper represents a method for calculate the heat dissipation capacity and discharge temperature for rotary compressors. The proposed heat dissipation model is used for calculating heat dissipating capacity of compressor in forced-convection/natural-convection and radiation heat transfer mode. The comparison between calculated result and experimental result for both constant speed compressors and variable speed compressors shows that the average heat dissipating capacity error is below 20...

  13. Meridional Considerations of the Centrifugal Compressor Development

    OpenAIRE

    Xu, C.; Amano, R. S.

    2012-01-01

    Centrifugal compressor developments are interested in using optimization procedures that enable compressor high efficiency and wide operating ranges. Recently, high pressure ratio and efficiency of the centrifugal compressors require impeller design to pay attention to both the blade angle distribution and the meridional profile. The geometry of the blades and the meridional profile are very important contributions of compressor performance and structure reliability. This paper presents some ...

  14. New coatings extend compressor service life

    Energy Technology Data Exchange (ETDEWEB)

    Chow, R. [Novacor Chemicals, Red Deer, Alberta (Canada); McMordie, B. [Sermatech International, Inc., Limerick, PA (United States); Wiegand, R. [Elliot Company, Jennetta, PA (United States)

    1995-10-01

    To lengthen production runs, a Canadian ethylene operator experimented with a coating system to protect a critical compressor`s rotor from hydrocarbon-polymerization/fouling. In ethylene manufacturing, compressor fouling is an accepted ``fact of life.`` Past attempts to minimize fouling in the crack-gas compression train were unsuccessful or marginally cost-effective. Applying protective coatings to a critical-service ethylene compressor rotor slowed oiling, thus lengthening the production run time by one year.

  15. Research on characteristics of air flow in corrugated tube for reciprocating compressor%往复式压缩机进气软管内气体流动特性研究

    Institute of Scientific and Technical Information of China (English)

    魏奇; 万小刚; 吴晴

    2011-01-01

    This paper gave the CFD simulation of the flowing in corrugated tube for reciprocating compressor. Simulation result shows that reverse flow exists along the flowing area and getting worse along with the increase of the tubes length or the flowing speed, which greatly influences the gas - intake of compressor.%采用CFD方法来对压缩机进气波纹软管内氦气流动问题进行数值模拟研究.结果表明:波纹软管内气体流动存在明显的回流区,并随着流速和管长的增加而愈加明显,对压缩机的进气量影响较大.

  16. 往复压缩机气流脉动和机械振动的工程控制%Engineering Control for Air Flow Pulsation and Mechanical Vibration in Reciprocating Compressors

    Institute of Scientific and Technical Information of China (English)

    杨保江

    2012-01-01

    This paper has mainly specified the reasons of causing reciprocating compressors pipeline vibration, the interactional factors and the methods of design, calculation and control in engineering.%叙述了往复压缩机管道振动引起的原因和相互影响的因素,以及工程上设计计算和控制的方法.

  17. 40 CFR 63.1012 - Compressor standards.

    Science.gov (United States)

    2010-07-01

    ... measured during each compliance test. (g) Reciprocating compressor exemption. Any existing reciprocating... 40 Protection of Environment 10 2010-07-01 2010-07-01 false Compressor standards. 63.1012 Section... Emission Standards for Equipment Leaks-Control Level 1 § 63.1012 Compressor standards. (a)...

  18. Small Radial Compressors: Aerodynamic Design and Analysis

    OpenAIRE

    K. A. R. Ismail; Rosolen, C. V. A. G.; Benevenuto, F. J.; Lucato, D.

    1998-01-01

    This paper presents a computational procedure for the analysis of steady one-dimensional centrifugal compressor. The numerical model is based on the conservation principles of mass, momentum and energy, and has been utilized to predict the operational and aerodynamic characteristics of a small centrifugal compressor as well as determining the performance and geometry of compressor blades, both straight and curved.

  19. Small Radial Compressors: Aerodynamic Design and Analysis

    Directory of Open Access Journals (Sweden)

    K. A. R. Ismail

    1998-01-01

    Full Text Available This paper presents a computational procedure for the analysis of steady one-dimensional centrifugal compressor. The numerical model is based on the conservation principles of mass, momentum and energy, and has been utilized to predict the operational and aerodynamic characteristics of a small centrifugal compressor as well as determining the performance and geometry of compressor blades, both straight and curved.

  20. Chapter 22: Compressed Air Evaluation Protocol

    Energy Technology Data Exchange (ETDEWEB)

    Benton, N.

    2014-11-01

    Compressed-air systems are used widely throughout industry for many operations, including pneumatic tools, packaging and automation equipment, conveyors, and other industrial process operations. Compressed-air systems are defined as a group of subsystems composed of air compressors, air treatment equipment, controls, piping, pneumatic tools, pneumatically powered machinery, and process applications using compressed air. A compressed-air system has three primary functional subsystems: supply, distribution, and demand. Air compressors are the primary energy consumers in a compressed-air system and are the primary focus of this protocol. The two compressed-air energy efficiency measures specifically addressed in this protocol are: high-efficiency/variable speed drive (VSD) compressor replacing modulating compressor; compressed-air leak survey and repairs. This protocol provides direction on how to reliably verify savings from these two measures using a consistent approach for each.

  1. Study of torque matching of revolving vane compressor and expander

    Science.gov (United States)

    Subiantoro, A.; Ooi, K. T.

    2015-08-01

    An investigation was carried out to find the most optimum configuration, particularly the torque matching characteristics, of an integrated Revolving Vane compressor- expander. To carry out the study, a mathematical model of the integrated compressor-expander was developed. An open cycle air refrigeration system was adopted. The controlled parameter was the angle shift between the compressor and the expander. The observed parameters were the peak torque requirement and the bearing load. The results show that when properly matched, the peak torque can be reduced by more than 65% while the bearing loads can be reduced by up to 25%, depending on operating conditions. Unfortunately, the optimum angle shifts for peak torque do not always coincide with those for bearing load. When the pressure and inertial components of the torques are comparable or when the inertial component is dominant, the optimum angle shifts for peak torque and bearing load are around 180° and 330°, respectively. When the pressure component is dominant, the optimum angle shift for peak torque is equal to the angle difference between the pressure peak torques of the compressor and the expander while for bearing load is around 150°.

  2. Analysis of thrust augmentation of turbojet engines by water injection at compressor inlet including charts for calculating compression processes with water injection

    Science.gov (United States)

    Wilcox, E Clinton; Trout, Arthur M

    1951-01-01

    A psychrometric chart having total pressure (sum of partial pressures of air and water vapor) as a variable, a Mollier diagram for air saturated with water vapor, and charts showing the thermodynamic properties of various air-water vapor and exhaust gas-water vapor mixtures are presented as aids in calculating the thrust augmentation of a turbojet engine resulting from the injection of water at the compressor inlet. Curves are presented that show the theoretical performance of the augmentation method for various amounts of water injected and the effects of varying flight Mach number, altitude, ambient-air temperature, ambient relative humidity, compressor pressure ratio, and inlet-diffuser efficiency. Numerical examples, illustrating the use of the psychrometric chart and the Mollier diagram in calculating both compressor-inlet and compressor-outlet conditions when water is injected at the compressor inlet, are presented.

  3. Applications and operating parameters are decisive. Are piston compressors still appropriate in refrigeration engineering?; Anwendung und Betriebsparameter entscheidend. Sind Hubkolbenverdichter in der Kaeltetechnik noch zeitgemaess?

    Energy Technology Data Exchange (ETDEWEB)

    Saar, Joerg [Danfoss GmbH, Offenbach (Germany). CRO Business Development Compressors

    2009-01-15

    Many years ago, scroll compressors began to conquer air conditioning engineering, second only to piston compressors and sometimes even surpassing them. Will there be a similar trend in refrigeration engineering, or is the scroll technology not appropriate for refrigeration purposes? To answer this question, it may be useful to have a look at the characteristics of the two compressor technologies. This will make it possible to compare them with a view to applications in refrigeration engineering. (orig.)

  4. Aerodynamic Losses in an Aero Engine Centrifugal Compressor with a Close-Coupled Pipe-Diffuser and a Radial-Axial Deswirler

    OpenAIRE

    Wilkosz, Benjamin Eduard

    2015-01-01

    In the work presented here, a detailed aerodynamic analysis of an aero engine centrifugal compressor is given. Steady and unsteady 3D-RANS simulations, as well as extensive experimental data have been used for the analysis. The compressor investigated contains a close-coupled pipe-diffuser. A radial-axial deswirler guides the air into the combustion chamber.The investigation presented gives a detailed insight in the loss mechanisms as well as their origin within the centrifugal compressor. In...

  5. Plasma Spraying Reclaims Compressor Housings

    Science.gov (United States)

    Leissler, George W.; Yuhas, John S.

    1991-01-01

    Plasma-spraying process used to build up material in worn and pitted areas. Newly applied material remachined to specified surface contours. Effective technique for addition of metal to out-of-tolerance magnesium-alloy turbine-engine compressor housings.

  6. Meridional Considerations of the Centrifugal Compressor Development

    Directory of Open Access Journals (Sweden)

    C. Xu

    2012-01-01

    Full Text Available Centrifugal compressor developments are interested in using optimization procedures that enable compressor high efficiency and wide operating ranges. Recently, high pressure ratio and efficiency of the centrifugal compressors require impeller design to pay attention to both the blade angle distribution and the meridional profile. The geometry of the blades and the meridional profile are very important contributions of compressor performance and structure reliability. This paper presents some recent studies of meridional impacts of the compressor. Studies indicated that the meridional profiles of the impeller impact the overall compressor efficiency and pressure ratio at the same rotational speed. Proper meridional profiles can improve the compressor efficiency and increase the overall pressure ratio at the same blade back curvature.

  7. Compressor Calorimeter Test of R-410A Alternative: R-32/134a Mixture Using a Scroll Compressor

    Energy Technology Data Exchange (ETDEWEB)

    Shrestha, Som S [ORNL; Sharma, Vishaldeep [ORNL; Abdelaziz, Omar [ORNL

    2014-02-01

    As a contribution to the AHRI Low-GWP Alternative Refrigerants Evaluation Program (AREP), this study compares the performance of lower-GWP alternative refrigerant R-32 + R-134a mixture, to that of refrigerant R-410A (baseline) in a scroll compressor designed for air-conditioning and heat pump applications. These comparisons were carried out via compressor calorimeter tests performed on a compressor designed for refrigerant R-410A and having a nominal rated capacity of 21,300 Btu/hr. Tests were conducted over a suction dew point temperature range of 10 F to 55 F in 5 F increments and a discharge dew point temperature range of 70 F to 140 F in 10 F increments. All the tests were performed with 20 F superheat, 40 F superheat, and 65 F suction temperature. A liquid subcooling level of 15 F was maintained for all the test conditions. The tests showed that the discharge temperature of the alternative refrigerant was higher than that of R-410A at all test conditions. Also, the energy efficiency ratio (EER) and cooling capacity of compressor using the alternative refrigerant were slightly lower in comparison to that of R-410A.

  8. Pulse compressor with aberration correction

    Energy Technology Data Exchange (ETDEWEB)

    Mankos, Marian [Electron Optica, Inc., Palo Alto, CA (United States)

    2015-11-30

    In this SBIR project, Electron Optica, Inc. (EOI) is developing an electron mirror-based pulse compressor attachment to new and retrofitted dynamic transmission electron microscopes (DTEMs) and ultrafast electron diffraction (UED) cameras for improving the temporal resolution of these instruments from the characteristic range of a few picoseconds to a few nanoseconds and beyond, into the sub-100 femtosecond range. The improvement will enable electron microscopes and diffraction cameras to better resolve the dynamics of reactions in the areas of solid state physics, chemistry, and biology. EOI’s pulse compressor technology utilizes the combination of electron mirror optics and a magnetic beam separator to compress the electron pulse. The design exploits the symmetry inherent in reversing the electron trajectory in the mirror in order to compress the temporally broadened beam. This system also simultaneously corrects the chromatic and spherical aberration of the objective lens for improved spatial resolution. This correction will be found valuable as the source size is reduced with laser-triggered point source emitters. With such emitters, it might be possible to significantly reduce the illuminated area and carry out ultrafast diffraction experiments from small regions of the sample, e.g. from individual grains or nanoparticles. During phase I, EOI drafted a set of candidate pulse compressor architectures and evaluated the trade-offs between temporal resolution and electron bunch size to achieve the optimum design for two particular applications with market potential: increasing the temporal and spatial resolution of UEDs, and increasing the temporal and spatial resolution of DTEMs. Specialized software packages that have been developed by MEBS, Ltd. were used to calculate the electron optical properties of the key pulse compressor components: namely, the magnetic prism, the electron mirror, and the electron lenses. In the final step, these results were folded

  9. Finite element model based fault prognosis on key components of the reciprocating compressor

    Energy Technology Data Exchange (ETDEWEB)

    Lu, Wenqing; Zhang, Laibin [Research Center of Oil and Gas Safety, Engineering Technology, China University of Petroleum, Changping, Beijing 102249 (China); Liang, Wei; Li, Shuguo [Research Center of Oil and Gas Safety Engineering Technology, China University of Petroleum, Changping, Beijing 102249 (China)

    2010-07-01

    In the petroleum industry, the reciprocating compressor is an important piece of equipment. Its safety and reliability need therefore to be closely monitored through study of its vibration, unfortunately its complex structure makes this difficult and experimental solutions are both costly and time consuming. The aim of this paper is to present a finite element analysis (FEA) to predict and locate breakage on various elements of the reciprocating compressor. A 3D model of the reciprocating compressor was built with SolidWorks and the ANSYS FE model was created; analyses were performed on crankshaft, connecting-rod, crosshead and air valve. Results revealed weaknesses on each component and means of strengthening the sites vulnerable to failure can thus be applied. These results are consistent with the problems noticed during normal operations. This study proved that the FEA is an effective and non-destructive method to diagnose faults in a reciprocating compressor.

  10. Technical aspects of a large size industrial process turbo compressor revamp

    Science.gov (United States)

    Świder, Piotr; Kozanecki, Zbigniew, Jr.; Graczykowski, Marek; Kryłłowicz, Władysław

    2015-12-01

    This paper describes several modernization aspects of the process 8 MW air compressor and its driver. The main aim of the revamp was to increase internal efficiencies of both the compressor and turbine and increase the load of the compressor without additional power consumption. The original pressure ratio was preserved. To meet these requirements a redesign of the flow path of both machineswas necessary.Moreover, the turbineworking conditions were changed from extraction-condensing to condensing. In terms of compressor, impeller blade redesign, adaptation of diffusers and Abradable seals were a part of the scope. The revamp was completed in April 2014 with all the requirements met. This paper covers the general outline and a comparison of the original and modernized machine operating parameters, design and technical assumptions and also describes some problematic issues which occurred during the realization of the project.

  11. Avoiding compressor surge during emergency shutdown hybridturbine systems

    Energy Technology Data Exchange (ETDEWEB)

    Pezzini, Paolo [University of Genova, Italy; Tucker, David [U.S. DOE; Traverso, Alberto [University of Genova, Italy

    2013-01-01

    A new emergency shutdown procedure for a direct-fired fuel cell turbine hybrid power system was evaluated using a hardware-based simulation of an integrated gasifier/fuel cell/turbine hybrid cycle (IGFC), implemented through the Hybrid Performance (Hyper) project at the National Energy Technology Laboratory, U.S. Department of Energy (NETL). The Hyper facility is designed to explore dynamic operation of hybrid systems and quantitatively characterize such transient behavior. It is possible to model, test, and evaluate the effects of different parameters on the design and operation of a gasifier/fuel cell/gas turbine hybrid system and provide a means of quantifying risk mitigation strategies. An open-loop system analysis regarding the dynamic effect of bleed air, cold air bypass, and load bank is presented in order to evaluate the combination of these three main actuators during emergency shutdown. In the previous Hybrid control system architecture, catastrophic compressor failures were observed when the fuel and load bank were cut off during emergency shutdown strategy. Improvements were achieved using a nonlinear fuel valve ramp down when the load bank was not operating. Experiments in load bank operation show compressor surge and stall after emergency shutdown activation. The difficulties in finding an optimal compressor and cathode mass flow for mitigation of surge and stall using these actuators are illustrated.

  12. Electrical Driven Means for Reciprocating Piston Compressor(Ⅰ)%往复活塞压缩机的电力驱动之一斑

    Institute of Scientific and Technical Information of China (English)

    高其烈

    2013-01-01

    This paper has specified the issues in electrical driven for air compressors with large and medium power in reciprocating piston compressors.%扼要论及往复活塞压缩机中的大功率者,及中等功率空压机的电力驱动若干问题.

  13. Diffusion models for Knudsen compressors

    OpenAIRE

    Aoki, Kazuo; Degond, Pierre; Takata, Shigeru; Yoshida, Hiroaki

    2007-01-01

    A rarefied gas in a long straight pipe with a periodic structure consisting of alternately arranged narrow and wide pipes and with periodic temperature distribution, which is known as the Knudsen compressor (or pump), is considered. Under the assumption that the pipe is much thinner than the period, a diffusion model that describes the pressure distribution and mass flux of the gas in each pipe element is derived, together with the connection conditions at the junctions of the narrow and wide...

  14. Modelling fluid flow in a reciprocating compressor

    Science.gov (United States)

    Tuhovcak, Jan; Hejčík, Jiří; Jícha, Miroslav

    2015-05-01

    Efficiency of reciprocating compressor is strongly dependent on the valves characteristics, which affects the flow through the suction and discharge line. Understanding the phenomenon inside the compressor is necessary step in development process. Commercial CFD tools offer wide capabilities to simulate the flow inside the reciprocating compressor, however they are too complicated in terms of computational time and mesh creation. Several parameters describing compressor could be therefore examined without the CFD analysis, such is valve characteristic, flow through the cycle and heat transfer. The aim of this paper is to show a numerical tool for reciprocating compressor based on the energy balance through the cycle, which provides valve characteristics, flow through the cycle and heat losses from the cylinder. Spring-damping-mass model was used for the valve description. Boundary conditions were extracted from the performance test of 4-cylinder semihermetic compressor and numerical tool validation was performed with indicated p-V diagram comparison.

  15. Modelling fluid flow in a reciprocating compressor

    Directory of Open Access Journals (Sweden)

    Tuhovcak Jan

    2015-01-01

    Full Text Available Efficiency of reciprocating compressor is strongly dependent on the valves characteristics, which affects the flow through the suction and discharge line. Understanding the phenomenon inside the compressor is necessary step in development process. Commercial CFD tools offer wide capabilities to simulate the flow inside the reciprocating compressor, however they are too complicated in terms of computational time and mesh creation. Several parameters describing compressor could be therefore examined without the CFD analysis, such is valve characteristic, flow through the cycle and heat transfer. The aim of this paper is to show a numerical tool for reciprocating compressor based on the energy balance through the cycle, which provides valve characteristics, flow through the cycle and heat losses from the cylinder. Spring-damping-mass model was used for the valve description. Boundary conditions were extracted from the performance test of 4-cylinder semihermetic compressor and numerical tool validation was performed with indicated p-V diagram comparison.

  16. Aerosolization of tobramycin (TOBI) with the PARI LC PLUS reusable nebulizer : which compressor to use? Comparison of the CR60 to the PortaNeb compressor

    NARCIS (Netherlands)

    Westerman, Elsbeth M; Boer, Anne H De; Touw, Daan J; Brun, Paul P H Le; Roldaan, Albert C; Frijlink, Henderik W; Heijerman, Harry G M

    2008-01-01

    Aerosol output, aerosol output rate, and aerosol size distribution are influenced by the compressed air flow rate through the nebulizer cup. Testing a nebulizer-compressor with a drug for inhalation in cystic fibrosis (CF) patients is mandatory prior to starting therapy. Tobramycin solution for inha

  17. Linear Motor Free Piston Compressor

    Science.gov (United States)

    Bloomfield, David P.

    1995-02-01

    A Linear Motor Free Piston Compressor (LMFPC), a free piston pressure recovery system for fuel cell powerplants was developed. The LMFPC consists of a reciprocating compressor and a reciprocating expander which are separated by a piston. In the past energy efficient turbochargers have been used for pressure large (over 50 kW) fuel cell powerplants by recovering pressure energy from the powerplant exhaust. A free piston compressor allows pressurizing 3 - 5 kW sized fuel cell powerplants. The motivation for pressurizing PEM fuel cell powerplants is to improve fuel cell performance. Pressurization of direct methanol fuel cells will be required if PEM membranes are to be used Direct methanol oxidation anode catalysts require high temperatures to operate at reasonable power densities. The elevated temperatures above 80 C will cause high water loss from conventional PEM membranes unless pressurization is employed. Because pressurization is an energy intensive process, recovery of the pressure energy is required to permit high efficiency in fuel cell powerplants. A complete LMFPC which can pressurize a 3 kW fuel cell stack was built. This unit is one of several that were constructed during the course of the program.

  18. Rotary Compressor With The Stationary Crankshaft

    OpenAIRE

    Dreiman, Nelik

    2014-01-01

    A parts of the contemporary rotary compressors are supported as by revolving crankshaft (rotor, roller, etc.), so by the housing (stator, pump, suction accumulator, etc.). Such dual supporting structure complicates assembly of a compressor due to the necessity of precision axial and radial positioning of the pump parts, motor rotor and stator. Developed novel rotary compressor provides a unitary assembly, in which a rotor of the driver -external rotor electric motor, is integrated with concen...

  19. Research on Metal Hydride Compressor System

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    Ti-Zr series Laves phase hydrogen storage alloys with good hydrogen storage properties, such as large hydrogen capacity, rapid hydriding and dehydriding rate, high compression ratio, gentle plateau, small hysteresis, easily being activated and long cyclic stability etc. for metal hydride compressor have been investigated. In addition, a hydride compressor with special characteristics, namely, advanced filling method, good heat transfer effect and reasonable structural design etc. has also been constructed. A hydride compressor cryogenic system has been assembled coupling the compressor with a J-T micro-throttling refrigeration device and its cooling capacity can reach 0.4 W at 25 K.

  20. Aspirated Compressors for High Altitude Engines Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Aurora Flight Sciences proposes to incorporate aspirated compressor technology into a high altitude, long endurance (HALE) concept engine. Aspiration has been...

  1. Twenty Years of Compressor Innovation at NTU, Singapore

    OpenAIRE

    Ooi, Kim Tiow

    2014-01-01

    In this paper, innovations in refrigeration compressors and their mechanisms which were conceptualised (and some of these were commercialised) at Nanyang Technological University in Singapore over the past twenty years are discussed and presented. These innovations include piezo compressor [1-3], sliding cam compressor [4], rotaprocating compressor [5], revolving vane compressor and its variants [6-14], revolving vane expander [15] and cross-vane mechanism for expander-compressor unit [16]. T...

  2. Development of Versatile Compressor Modeling using Approximation Techniques for Alternative Refrigerants Evaluation

    Energy Technology Data Exchange (ETDEWEB)

    Abdelaziz, Omar [ORNL; Shrestha, Som S [ORNL

    2014-01-01

    Refrigerants are the life-blood of vapor compression systems that are widely used in Heating, Ventilation, Air-Conditioning, and Refrigeration (HVAC&R) applications. The HVAC&R community is currently transitioning from main-stream refrigerants that have high Global Warming Potential (GWP) to alternative lower-GWP refrigerants. During this transition, it is important to account for the life cycle climate performance of alternative refrigerants since their performance will be different than that of higher-GWP refrigerants. This requires the evaluation of the system performance with the new refrigerants. Unfortunately, it is extremely difficult to predict the realistic performance of new alternative refrigerants without experimental validation. One of the main challenges in this regard is modeling the compressor performance with high fidelity due to the complex interaction of operating parameters, geometry, boundary conditions, and fluid properties. High fidelity compressor models are computationally expensive and require significant pre-processing to evaluate the performance of alternative refrigerants. This paper presents a new approach to modeling compressor performance when alternative refrigerants are used. The new modeling concept relies on using existing compressor performance to create an approximate model that captures the dependence of compressor performance on key operating parameters and fluid properties. The model can be built using a myriad of approximation techniques. This paper focuses on Kriging-based techniques to develop higher fidelity approximate compressor models. Baseline and at least one alternative refrigerant performance data are used to build the model. The model accuracy was evaluated by comparing the model results with compressor performance data using other refrigerants. Preliminary results show that the approximate model can predict the compressor mass flow rate and power consumption within 5%.

  3. Elimination of microorganisms from dental operatory compressed air.

    Science.gov (United States)

    De Ciccio, A; Chan, E C

    1998-01-01

    Compressed air is used to power high-speed handpieces, as well as to dry and clean surfaces in the oral cavity during patient treatment, in all dental operatories. The compressed air used in the dental operatories located in large institutions such as universities or hospitals is generally obtained from a central source, and is produced by continually running compressors. In operatories located in private practice settings, compressed air is obtained from small on-site air compressors, which may be run less frequently. A survey was made of operatories in the Montreal area to determine the microbial load of the compressed air produced by air compressors. An air sampler was used to collect compressed air and impinge it on a rotating agar medium surface. Compared to the air produced from compressors in constant use, the air collected from compressors that ran intermittently had a very high microbial load. The efficacy of an apparatus designed to sterilize the contaminated air produced by small, on-site compressors was tested. Called a Purilair, this device heats every particle of inflowing compressed air to 250 degrees C and then forces it through a fine-pore ceramic filter. In three private practice operatories, an in-line Purilair effectively sterilized the air being delivered by small compressors. The same result was obtained in the laboratory when lyophilized spores and cells of Bacillus stearothermophilus and conidia of Penicillium notatum and Aspergillus niger were sprayed into the intake line of the apparatus. PMID:9473876

  4. Elimination of microorganisms from dental operatory compressed air.

    Science.gov (United States)

    De Ciccio, A; Chan, E C

    1998-01-01

    Compressed air is used to power high-speed handpieces, as well as to dry and clean surfaces in the oral cavity during patient treatment, in all dental operatories. The compressed air used in the dental operatories located in large institutions such as universities or hospitals is generally obtained from a central source, and is produced by continually running compressors. In operatories located in private practice settings, compressed air is obtained from small on-site air compressors, which may be run less frequently. A survey was made of operatories in the Montreal area to determine the microbial load of the compressed air produced by air compressors. An air sampler was used to collect compressed air and impinge it on a rotating agar medium surface. Compared to the air produced from compressors in constant use, the air collected from compressors that ran intermittently had a very high microbial load. The efficacy of an apparatus designed to sterilize the contaminated air produced by small, on-site compressors was tested. Called a Purilair, this device heats every particle of inflowing compressed air to 250 degrees C and then forces it through a fine-pore ceramic filter. In three private practice operatories, an in-line Purilair effectively sterilized the air being delivered by small compressors. The same result was obtained in the laboratory when lyophilized spores and cells of Bacillus stearothermophilus and conidia of Penicillium notatum and Aspergillus niger were sprayed into the intake line of the apparatus.

  5. High frequency dynamics in centrifugal compressors

    NARCIS (Netherlands)

    Twerda, A.; Meulendijks, D.; Smeulers, J.P.M.; Handel, R. van den; Lier, L.J. van

    2008-01-01

    Problems with centrifugal compressors relating to high frequency, i.e. Blade passing frequency (BPF) are increasing. Pulsations and vibrations generated in centrifugal compressors can lead to nuisance, due to strong tonal noise, and even breakdown. In several cases the root cause of a failure or a n

  6. Scroll Compressor Oil Pump Analysis

    Science.gov (United States)

    Branch, S.

    2015-08-01

    Scroll compressors utilize three journal bearings to absorb gas, friction and inertial loads exerted on the crankshaft. To function properly, these bearings must be lubricated with a certain amount of oil. The focus of this paper will be to discuss how computational fluid dynamics can be used to predict oil flow out of a single-stage oil pump. The effects of speed and lubricant viscosity on pump output will also be presented. The comparisons will look at mass flow rates, differences in pressure, and torque at various speeds and dynamic viscosities. The computational fluid dynamic analysis results will be compared with actual lab testing where a crankshaft bench tester was built.

  7. Axial flow positive displacement worm compressor

    Science.gov (United States)

    Murrow, Kurt David (Inventor); Giffin, Rollin George (Inventor); Fakunle, Oladapo (Inventor)

    2010-01-01

    An axial flow positive displacement compressor has an inlet axially spaced apart and upstream from an outlet. Inner and outer bodies have offset inner and outer axes extend from the inlet to the outlet through first and second sections of a compressor assembly in serial downstream flow relationship. At least one of the bodies is rotatable about its axis. The inner and outer bodies have intermeshed inner and outer helical blades wound about the inner and outer axes respectively. The inner and outer helical blades extend radially outwardly and inwardly respectively. The helical blades have first and second twist slopes in the first and second sections respectively. The first twist slopes are less than the second twist slopes. An engine including the compressor has in downstream serial flow relationship from the compressor a combustor and a high pressure turbine drivingly connected to the compressor by a high pressure shaft.

  8. Centrifugal compressor design for electrically assisted boost

    Science.gov (United States)

    Y Yang, M.; Martinez-Botas, R. F.; Zhuge, W. L.; Qureshi, U.; Richards, B.

    2013-12-01

    Electrically assisted boost is a prominent method to solve the issues of transient lag in turbocharger and remains an optimized operation condition for a compressor due to decoupling from turbine. Usually a centrifugal compressor for gasoline engine boosting is operated at high rotational speed which is beyond the ability of an electric motor in market. In this paper a centrifugal compressor with rotational speed as 120k RPM and pressure ratio as 2.0 is specially developed for electrically assisted boost. A centrifugal compressor including the impeller, vaneless diffuser and the volute is designed by meanline method followed by 3D detailed design. Then CFD method is employed to predict as well as analyse the performance of the design compressor. The results show that the pressure ratio and efficiency at design point is 2.07 and 78% specifically.

  9. Refrigeration system having standing wave compressor

    Science.gov (United States)

    Lucas, Timothy S.

    1992-01-01

    A compression-evaporation refrigeration system, wherein gaseous compression of the refrigerant is provided by a standing wave compressor. The standing wave compressor is modified so as to provide a separate subcooling system for the refrigerant, so that efficiency losses due to flashing are reduced. Subcooling occurs when heat exchange is provided between the refrigerant and a heat pumping surface, which is exposed to the standing acoustic wave within the standing wave compressor. A variable capacity and variable discharge pressure for the standing wave compressor is provided. A control circuit simultaneously varies the capacity and discharge pressure in response to changing operating conditions, thereby maintaining the minimum discharge pressure needed for condensation to occur at any time. Thus, the power consumption of the standing wave compressor is reduced and system efficiency is improved.

  10. Centrifugal compressor design for electrically assisted boost

    International Nuclear Information System (INIS)

    Electrically assisted boost is a prominent method to solve the issues of transient lag in turbocharger and remains an optimized operation condition for a compressor due to decoupling from turbine. Usually a centrifugal compressor for gasoline engine boosting is operated at high rotational speed which is beyond the ability of an electric motor in market. In this paper a centrifugal compressor with rotational speed as 120k RPM and pressure ratio as 2.0 is specially developed for electrically assisted boost. A centrifugal compressor including the impeller, vaneless diffuser and the volute is designed by meanline method followed by 3D detailed design. Then CFD method is employed to predict as well as analyse the performance of the design compressor. The results show that the pressure ratio and efficiency at design point is 2.07 and 78% specifically

  11. Experimental Investigations of Micro Air Injection to Control Rotating Stall

    Institute of Scientific and Technical Information of China (English)

    Chaoqun Nie; Zhiting Tong; Shaojuan Geng; Junqiang Zhu; Weiguang Huang

    2007-01-01

    Steady discrete micro air injection at the tip region in front of the first compressor rotor has been proved to be an effective method to delay the inception of rotating stall in a low speed axial compressor. Considering the practical application a new type of micro injector was designed and described in this paper, which was imbedded in the casing and could be moved along the chord. In order to verify its feasibility to other cases, such as high subsonic axial compressor or centrifugal compressor, some other cases have been studied. Experimental results of the same low speed axial compressor showed that the new injector could possess many other advantages besides successfully stabilizing the compressor. Experiments performed on a high subsonic axial compressor confirmed the effectiveness of micro air injection when the relative velocity at the blade tip is high subsonic. Meanwhile in order to explore its feasibility in centrifugal compressor, a similar micro injector was designed and tested on a low speed centrifugal compressor with vaned diffuser. The injected mass flow was a bit larger than that used in axial compressors and the results showed micro injection could also delay the onset of rotating stall in the centrifugal compressor.

  12. Hub and shroud fillets influence on the radial compressor stage efficiency

    Directory of Open Access Journals (Sweden)

    Syka Tomáš

    2015-01-01

    Full Text Available Article describes numerical simulations of an air flow in the radial compressor stage in the NUMECA CFD software. During the tasks evaluating the stepped and straight impeller seals and hub and shroud fillets influence on working characteristics and flow field was observed. Also the CFD results comparison with results from the empiric design tool and the measurement is described.

  13. The intrinsic equation of planar curves and the geometry of the scroll compressor

    DEFF Research Database (Denmark)

    Gravesen, Jens; Henriksen, Christian

    1999-01-01

    The scroll compressor is an ingenious machine used for compressing air or refrigerant, which was originally invented in 1905 by Léon Creux. The classical design consist of two nested identical scrolls given by circle involutes, one of which is rotated through 180° with respect to the other...

  14. Thermal analysis of car air conditioning

    Science.gov (United States)

    Trzebiński, Daniel; Szczygieł, Ireneusz

    2010-10-01

    Thermodynamic analysis of car air cooler is presented in this paper. Typical refrigerator cycles are studied. The first: with uncontrolled orifice and non controlled compressor and the second one with the thermostatic controlled expansion valve and externally controlled compressor. The influence of the refrigerant decrease and the change of the air temperature which gets to exchangers on the refrigeration efficiency of the system; was analysed. Also, its effectiveness and the power required to drive the compressor were investigated. The impact of improper refrigerant charge on the performance of air conditioning systems was also checked.

  15. Radial compressors for refrigeration engineering; Radialverdichter fuer Kaeltemaschinen. Konstruktive Varianten

    Energy Technology Data Exchange (ETDEWEB)

    Hartmann, K.; Steinbach, U. [Carrier GmbH und Co. KG, Unterschleissheim (Germany)

    2002-07-01

    Producers of refrigerators use a wide range of different design concepts for radial compressors, which is astonishing given that the refrigerating and air conditioning industry is a mature industry. [German] Von den einzelnen Kaeltemaschinenherstellern werden unterschiedliche Konstruktionskonzepte fuer Radialverdichter verwendet - einstufig oder mehrstufig, beschaufelte oder schaufellose Diffusoren, Antriebsmotoren in hermetischer oder offener Bauart, Laufraeder mit oder ohne Deckband, verstellbare oder unveraenderliche Laufradgeometrie, Kaeltemittel mit niedrigem oder mit hohem Druck. Fuer eine ausgereifte Industrie wie die Klima- und Kaelteindustrie mutet eine solche Vielfalt befremdlich an. (orig.)

  16. Subsynchronous instability of a geared centrifugal compressor of overhung design

    Science.gov (United States)

    Hudson, J. H.; Wittman, L. J.

    1980-01-01

    The original design analysis and shop test data are presented for a three stage (poster) air compressor with impellers mounted on the extensions of a twin pinion gear, and driven by an 8000 hp synchronous motor. Also included are field test data, subsequent rotor dynamics analysis, modifications, and final rotor behavior. A subsynchronous instability existed on a geared, overhung rotor. State-of-the-art rotor dynamics analysis techniques provided a reasonable analytical model of the rotor. A bearing modification arrived at analytically eliminated the instability.

  17. 33 CFR 154.826 - Vapor compressors and blowers.

    Science.gov (United States)

    2010-07-01

    ... system acceptable to the Commandant (CG-522). (b) If a reciprocating or screw-type compressor handles... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Vapor compressors and blowers....826 Vapor compressors and blowers. (a) Each inlet and outlet to a compressor or blower which...

  18. Air

    Science.gov (United States)

    ... house) Industrial emissions (like smoke and chemicals from factories) Household cleaners (spray cleaners, air fresheners) Car emissions (like carbon monoxide) *All of these things make up “particle pollution.” They mostly come from cars, trucks, buses, and ...

  19. Parametric design of air powered car

    Energy Technology Data Exchange (ETDEWEB)

    Sundar, T.M.; Kumar, B.P.; Suresh, R. [Tamilnadu College of Engineering, Coimbatore (India). Dept. of Mechanical Engineering

    2006-07-01

    An air-powered car was described with particular reference to its thermodynamic properties. The car was based on an external combustion engine. Air suction occurred in a piston and cylinder assembly through an air vent, where it was then compressed to higher pressures. The compressed air then entered a multi-stage reciprocating single-acting air compressor where the air was further compressed. Power for the compressor was provided by a double-battery system and a relay circuit to trigger the battery connection. Compressed air was stored in a compressed air tank and controlled by valves. The valves were controlled by a contour profile of an overhead camshift. Design specifications were included for the cylinder and cylinder liner; the pistons; the connecting rod; crank; valve gear mechanism; and the compressor. Results of the thermodynamic analysis indicated that the air-powered car is technologically feasible. 7 refs., 3 tabs., 1 fig.

  20. The NLC L-Band Bunch Compressor

    International Nuclear Information System (INIS)

    The first stage bunch compressor in the NLC injector complex compresses the e+/e- beams from a bunch length of 5 mm rms to 0.5 mm rms at the beam energy of 2 GeV. To obtain this compression ratio, the compressor rf section operates with an rf frequency of 1.4 GHz and a voltage of about 140 MV while a magnetic wiggler is used to generate an R56 = 0.5 m. The bunch compressor is designed to operate with a beam from the damping ring that has a bunch spacing slew of 20ps across the bunch train due to the transient loading in the damping rings. The compressor RF section is required to produce a specific energy profile along the bunch train so that the bunch spacing can be corrected in the compressor bending section. Further, the 1-amp beam heavily loads the compressor linac and beam loading compensation is essential to prevent a phase variation along the bunch train in the downstream linacs. In this paper, we will present simulation results of the beam loading compensation using a ΔT scheme assuming various initial bunch spacing arrangements. We will study the impact of the different compressor energy profiles on the beam energy, energy spread, and bunch length at the IP

  1. 3-D Transient CFD Model For A Rolling Piston Compressor With A Dynamic Reed Valve

    OpenAIRE

    Ding, Hui; Gao, Haiyang

    2014-01-01

    Rolling pistons are widely used as compressors in air conditioning systems due to their small size, low cost, and high performance. Reed valves, a special type of check valve driven by hydraulic forces, are commonly used with many types of compressors to restrict the flow to one direction. Reed valves are typically made of a thin layer of metal or plastic materials. The valve will bend in response to fluid pressure forces to open up the flow channel at the proper moment within the compression...

  2. Experimental investigation of a forced response condition in a multistage compressor

    Science.gov (United States)

    Murray, William Louis, III

    The objective of this research is twofold. Firstly, the design, development, and construction of a test facility for a Honeywell APU-style centrifugal compressor was implemented, as well as the design and construction of an inlet flow experiment. Secondly, the aeromechanical response of an embedded stage in the Purdue 3-Stage axial research compressor was analyzed through a suite of different measurement techniques in the fulfillment of the end of the GUIde IV Consortium contract. The purpose of the first phase of Honeywell work was to comprehensively measure the flow field of an APU-style centrifugal compressor inlet through the use of Laser Doppler Velocimetry (LDV). A portion of a Honeywell supplied inlet was modified to provide optical access to the elbow, and a gas ejector system was designed and constructed to provide the same suction to the inlet that it would see during operation with the compressor. A performance and health monitoring electronics system was designed and purchased to support the testing of the Honeywell inlet ejector system and eventually it will be used for testing with a centrifugal compressor. Additionally, a secondary air and oil system has been designed and is currently being constructed in the test cell in preparation for the arrival of the Honeywell compressor this summer. An embedded rotor stage in the Purdue 3-stage compressor, with a Campbell diagram crossing of the 1T vibratory mode was analyzed with a suite of measurement systems. In addition to steady state compressor performance measurements, other types of measurements were used to characterize the aerodynamic forcing function for this forced response condition including: NSMS, high-frequency pressure transducers mounted in the casing and in a downstream stator, and cross-film thermal anemometry. Rotor geometry was measured by Aerodyne using an in-situ laser scanning technique. Vibrometry testing was performed at WPAFB to characterize safe operating speeds for stator

  3. Analysis of reciprocating compressor piston rod failures

    Energy Technology Data Exchange (ETDEWEB)

    Tripp, H.A.; Drosjack, M.J.

    1984-02-01

    This report presents the analysis of five piston rod failures which occurred on reciprocating compressors. Calculations are shown for rod stress which includes nominal rod loading sources as well as additional loads due to unusual pressure losses in the compressor valves, flexure of the rods due to misalignment, and manufacturing errors. The additional loads were incorporated on the basis of field measurements. The stress values are used with Baquin's equation to produce fatigue life curves for the rods. Based on the calculations, recommendations for modified rods were made. The calculation procedures are described in a manner which will permit their application to other reciprocating compressors.

  4. Compressor Part I: Measurement and Design Modeling

    Directory of Open Access Journals (Sweden)

    Thomas W. Bein

    1999-01-01

    method used to design the 125-ton compressor is first reviewed and some related performance curves are predicted based on a quasi-3D method. In addition to an overall performance measurement, a series of instruments were installed on the compressor to identify where the measured performance differs from the predicted performance. The measurement techniques for providing the diagnostic flow parameters are also described briefly. Part II of this paper provides predictions of flow details in the areas of the compressor where there were differences between the measured and predicted performance.

  5. Air

    International Nuclear Information System (INIS)

    In recent years several regulations and standards for air quality and limits for air pollution were issued or are in preparation by the European Union, which have severe influence on the environmental monitoring and legislation in Austria. This chapter of the environmental control report of Austria gives an overview about the legal situation of air pollution control in the European Union and in specific the legal situation in Austria. It gives a comprehensive inventory of air pollution measurements for the whole area of Austria of total suspended particulates, ozone, volatile organic compounds, nitrogen oxides, sulfur dioxide, carbon monoxide, heavy metals, benzene, dioxin, polycyclic aromatic hydrocarbons and eutrophication. For each of these pollutants the measured emission values throughout Austria are given in tables and geographical charts, the environmental impact is discussed, statistical data and time series of the emission sources are given and legal regulations and measures for an effective environmental pollution control are discussed. In particular the impact of fossil-fuel power plants on the air pollution is analyzed. (a.n.)

  6. Development of a Hybrid Compressor/Expander Module for Automotive Fuel Cell Applications

    Energy Technology Data Exchange (ETDEWEB)

    McTaggart, Paul

    2004-12-31

    In this program TIAX LLC conducted the development of an advanced technology compressor/expander for supplying compressed air to Proton Exchange Membrane (PEM) fuel cells in transportation applications. The overall objective of this program was to develop a hybrid compressor/expander module, based on both scroll and high-speed turbomachinery technologies, which will combine the strengths of each technology to create a concept with superior performance at minimal size and cost. The resulting system was expected to have efficiency and pressure delivery capability comparable to that of a scroll-only machine, at significantly reduced system size and weight when compared to scroll-only designs. Based on the results of detailed designs and analyses of the critical system elements, the Hybrid Compressor/Expander Module concept was projected to deliver significant improvements in weight, volume and manufacturing cost relative to previous generation systems.

  7. Design and Prototyping of Micro Centrifugal Compressor for Ultra Micro Gas Turbine

    Institute of Scientific and Technical Information of China (English)

    Shimpei MIZUKI; Toshiyuki HIRANO; Yoshiyuki KOIZUMI; Gaku MINORIKAWA; Hoshio TSUJITA; Mitsuo IWAHARA; Ronglei GU; Yutaka OHTA; Eisuke OUTA

    2005-01-01

    In order to establish the design methodology of an ultra micro centrifugal compressor, which is the most important component of an ultra micro gas turbine unit, a 10 times size of the final target compressor (impeller outer diameter 40 mm, corrected rotational speed 220,000 r/min) was designed. The problems to be solved for downsizing were examined and a 2-dimensional impeller was chosen as the first model due to its productivity.The conventional 1D prediction method and CFD were used. The prototyped compressor was tested by using cold air at the reduced speed of 110,000 r/min. Following to the 10 times model, a 5 times size of the final target model having fully 3-dimensional shape (impeller outer diameter 20mm, corrected rotational speed 500,000r/min) was designed and tested by using hot gas at the reduced speed of 250,000 r/min.

  8. Virtual Training of Compressor Control Room Project

    Data.gov (United States)

    National Aeronautics and Space Administration — MYMIC will analyze, design, develop and evaluate the Virtual Control Room – Compressor Station (VCoR-CS) training system. VCoR-CS will provide procedural...

  9. High Speed Compressor for Subcooling Propellants Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Propellant densification systems for LH2 require compression systems that develop significant head. In the past this has required multiple stages of compressors...

  10. A Thermodynamic Study of Air Cycle Machine for Aeronautical Applications

    OpenAIRE

    Santos, A.P.P.; C.R. Andrade; Zaparoli, E. L.

    2014-01-01

    This work focuses on a thermodynamic study of an air cycle machine (ACM) for aircraft air-conditioning purposes. The ACM configuration mainly includes two compact heat exchangers, a compressor and an expander. The energy to drive this machine comes from the compressed air bleed from the compressor of the aircraft propulsion turbine. Some design features that affect the ACM performance will be studied: aircraft Mach number, cabin altitude, cabin recirculated air temperature and the percentage ...

  11. Towards Centrifugal Compressor Stages Virtual Testing

    OpenAIRE

    Guidotti, Emanuele

    2014-01-01

    Flow features inside centrifugal compressor stages are very complicated to simulate with numerical tools due to the highly complex geometry and varying gas conditions all across the machine. For this reason, a big effort is currently being made to increase the fidelity of the numerical models during the design and validation phases. Computational Fluid Dynamics (CFD) plays an increasing role in the assessment of the performance prediction of centrifugal compressor stages. Historically, CFD wa...

  12. Aerodynamic instabilities in transonic centrifugal compressor

    OpenAIRE

    Buffaz, Nicolas; Trébinjac, Isabelle

    2014-01-01

    International audience This paper presents the analysis of the instabilities inception in a transonic centrifugal com-pressor for different rotation speeds. The analysis was conducted from experimental results obtained with unsteady pressure sensors implanted in the inducer, vaneless diffuser and vaned diffuser. Beyond the stability limit the compressor enters into a deep surge without any precursor, whatever the speed. The surge process is initiated in the vaned diffuser by a massive boun...

  13. Thermal Equilibrium and Wet Gas Compressor Performance

    OpenAIRE

    Aalvik, Marthe

    2011-01-01

    The wet gas performance model established for this master s thesis is based on results achieved from a single stage, low pressure ratio, centrifugal compressor set up at NTNU. Water droplets are injected to the flow right before the inlet. The GMF varies from 0.9 to 0.65 throughout the experiments preformed. Compressor performance is achieved by simulations in HYSYS with atmospheric inlet conditions. The importance of accurate measurements is evident to achieve the correct performance. A lite...

  14. Preliminary aerothermal design of axial compressors

    OpenAIRE

    Piscopo, Giovanni

    2013-01-01

    This dissertation documents a compressor preliminary design study conducted by the author in fulfilment of his MSc thesis requirements. The compressor is intended for a new development engine within the 20Klbf thrust category, planned to be used on a short-haul aircraft, namely the ERJ-190. A market research suggests that there exists a definite opportunity for a commercially profitable engine within this thrust class. Furthermore, the proposed new engine is projected to out...

  15. RELAP5-3D Compressor Model

    Energy Technology Data Exchange (ETDEWEB)

    James E. Fisher; Cliff B. Davis; Walter L. Weaver

    2005-06-01

    A compressor model has been implemented in the RELAP5-3D© code. The model is similar to that of the existing pump model, and performs the same function on a gas as the pump performs on a single-phase or two-phase fluid. The compressor component consists of an inlet junction and a control volume, and optionally, an outlet junction. This feature permits cascading compressor components in series. The equations describing the physics of the compressor are derived from first principles. These equations are used to obtain the head, the torque, and the energy dissipation. Compressor performance is specified using a map, specific to the design of the machine, in terms of the ratio of outlet-to-inlet total (or stagnation) pressure and adiabatic efficiency as functions of rotational velocity and flow rate. The input quantities are specified in terms of dimensionless variables, which are corrected to stagnation density and stagnation sound speed. A small correction was formulated for the input of efficiency to account for the error introduced by assumption of constant density when integrating the momentum equation. Comparison of the results of steady-state operation of the compressor model to those of the MIT design calculation showed excellent agreement for both pressure ratio and power.

  16. Shape memory alloy adaptive control of gas turbine engine compressor blade tip clearance

    Science.gov (United States)

    Schetky, Lawrence M.; Steinetz, Bruce M.

    1998-06-01

    The ambient air ingested through the inlet of a gas turbine is first compressed by an axial compressor followed by further compression in a centrifugal compressor and then fed into the combustion chamber where ignition and expansion take place to produce the engine thrust. The axial compressor typically has five or more stages which consist of revolving blades and stators and the overall performance of the turbine is strongly affected by the compressor efficiency. When the turbine is turned on, to accommodate the rapid initial increase in the compressor blade length due to centrifugal force, the cold turbine has a built in clearance between the turbine blade tip and the casing. As the turbine reached its operating temperature there is a further increase in the blade length due to thermal expansion and, at the same time, the diameter of the casing increases. The net result is that when these various components have reached their equilibrium temperatures, the initial cold build clearance is reduced, but there remains a residual clearance. The magnitude of this clearance has a direct effect on the compressor efficiency and can be stated as: Δη/Δ CLR equals 0.5 where η is efficiency and CLR is the tip clearance. The concept of adaptive tip clearance control is based on the ability of a shape memory alloy ring to shrink to a predetermined diameter when heated to the temperature of a particular stage, and thus reducing the tip clearance. The ring is fabricated from a CuAlNi shape memory alloy and is mounted in the casing so as to be coaxial with the rotating blades of the particular stage. When cold, the ring dimensions are such as to provide the required cold build clearance, but when at operating temperature the reduced diameter creates a very small tip clearance. The clearance provided by this concept is much smaller than the clearance normally obtained for a turbine of the size being studied.

  17. Performance evaluation of high speed compressors for high speed multipliers

    Directory of Open Access Journals (Sweden)

    Nirlakalla Ravi

    2011-01-01

    Full Text Available This paper describes high speed compressors for high speed parallel multipliers like Booth Multiplier, Wallace Tree Multiplier in Digital Signal Processing (DSP. This paper presents 4-3, 5-3, 6-3 and 7-3 compressors for high speed multiplication. These compressors reduce vertical critical path more rapidly than conventional compressors. A 5-3 conventional compressor can take four steps to reduce bits from 5 to 3, but the proposed 5-3 takes only 2 steps. These compressors are simulated with H-Spice at a temperature of 25°C at a supply voltage 2.0V using 90nm MOSIS technology. The Power, Delay, Power Delay Product (PDP and Energy Delay Product (EDP of the compressors are calculated to analyze the total propagation delay and energy consumption. All the compressors are designed with half adder and full Adders only.

  18. Non Adiabatic Centrifugal Compressor Gas Dynamic Performance Definition

    OpenAIRE

    Soldatova, Kristina

    2014-01-01

    Most centrifugal compressors operate in conditions with negligible heat transfer (adiabatic compression). Their plant tests conditions are similar or close to adiabatic conditions. Test regulations establish measures to diminish influence of a heat transfer “compressor body – atmospheric air” to an exit temperature. Therefore a temperature rise in a compressor is used to calculate a work input coefficient and efficiency. Unlike it high pressure centrifugal compressors of gas turbines and supe...

  19. Coupled Thermodynamic Behavior of New Screw Compressors Rotors Profile

    Directory of Open Access Journals (Sweden)

    Arístides Rivera Torres

    2010-05-01

    Full Text Available The article displays an evaluation of the thermodynamic behavior of screw compressor rotors with new profiles, obtained with the help of the Scorpath 2000 software. This allows predicting precisely the operation of the compressor, as well as its thermodynamic evaluation, under equal conditions, with the work of other compressors fitted with rotor profiles of other kinds.

  20. 40 CFR 60.482-3a - Standards: Compressors.

    Science.gov (United States)

    2010-07-01

    ... Administrator. (j) Any existing reciprocating compressor in a process unit which becomes an affected facility... 40 Protection of Environment 6 2010-07-01 2010-07-01 false Standards: Compressors. 60.482-3a..., Reconstruction, or Modification Commenced After November 7, 2006 § 60.482-3a Standards: Compressors. (a)...

  1. 40 CFR 60.482-3 - Standards: Compressors.

    Science.gov (United States)

    2010-07-01

    ... designation, annually, and at other times requested by the Administrator. (j) Any existing reciprocating... Standards: Compressors. (a) Each compressor shall be equipped with a seal system that includes a barrier... paragraphs (h), (i), and (j) of this section. (b) Each compressor seal system as required in paragraph...

  2. Advanced Compressor Designs for High Energy Petawatt Pulse Generation

    Energy Technology Data Exchange (ETDEWEB)

    Fittinghoff, D N; Wattellier, B; Barty, C P J

    2003-09-09

    We discuss compressor designs for a proposed multikilojoule, sub-picosecond beamline at the National Ignition Facility. A novel grating configuration reduces the size of the compressor chamber. Optimization of the design leads to a 4.7 x 1.4 x 0.4 m{sup 3} minimum compressor volume.

  3. Design and Prototyping of Micro Centrifugal Compressor

    Institute of Scientific and Technical Information of China (English)

    Shimpei Mizuki; Gaku Minorikawa; Toshiyuki Hirano; Yuichiro Asaga; Naoki Yamaguchi; Yutaka Ohta; Eisuke Outa

    2003-01-01

    In order to establish the design methodology of ultra micro centrifugal compressor, which is the most important component of ultra micro gas turbine unit, a 10 times of the final target size model was designed, prototyped and tested. The problems to be solved for downsizing were examined and 2-dimensional impeller was chosen as the first model due to its productivity. The conventional 1D prediction method, CFD and the inverse design were attempted. The prototyped compressor was driven by using a turbocharger and the performance characteristics were measured.

  4. Active compressor engine silencer reduces exhaust noise

    International Nuclear Information System (INIS)

    An active industrial silencer on a compressor engine at a Tenneco Gas station has reduced low-frequency 'rumbling' noise by 8 dB during trials while lowering backpressure about 90$. This 8 dB reduction of the piston firing frequency corresponds to a more than 80% decrease in emitted acoustic power. The silencing unit, installed on one of six engines at the station near Eden, N.Y., continues in operation. Based on the results, the manufacturer is identifying additional compressor sites for further tests. This paper reviews this project

  5. The Simple Performance Evaluation Method of VRF System Using Volumetric Efficiency of Compressor

    OpenAIRE

    Sekine, Naruhiro; Furuhashi, Yuma; Kametani, Shigeki

    2012-01-01

    This paper deals with the simple performance evaluation method of variable refrigerant flow (hereafter VRF) system using volumetric efficiency of compressor. Generally, it is very difficult to evaluate the actual performance of VRF system, and it is a matter of urgency to establish the performance evaluation method on the actual condition. Especially, the simple method which can be used by user is essential to sound development of the air conditioning system. The refrigerant mass flow and the...

  6. Centrifugal Compressor Performance Deviations with Various Refrigerants, Impeller Sizes and Shaft Speeds

    OpenAIRE

    Wu, Yuanjie; Thilges, Chris

    2014-01-01

    Under the pressure of the Montreal Protocol originally written in 1987, the current popularly used HCFC and HFC refrigerants for comfortable air conditioning, such as low pressure refrigerant R123, will have to be phased out in the near future. This forces companies in centrifugal chiller industry to redesign and retest new centrifugal compressors which can accommodate alternative refrigerants. Keeping the present flow path designs is an economic design process for the alternative refrigerant...

  7. APPLICATION OF A PLC TO A LABORATORY COMPRESSOR WORKSHOP CONTROL SYSTEM

    Directory of Open Access Journals (Sweden)

    Wojciech GÓRA

    2016-06-01

    Full Text Available In this paper a control system of air compressors in a university laboratory is presented. The control system, which is built using the Astraada RCC972 and the GE 90-20 drivers, is an extension of the two states’ inputs and outputs of Astraada. To visualize the work stand, the PC computer class and the Proficy Machine Edition (ME View software were applied. Selected results from the tests of the built control system are presented.

  8. 5600kW空气压缩机电机磁平衡保护应用%Application of 5 600 kW Air Compressor Motor Magnetic Balance Protection

    Institute of Scientific and Technical Information of China (English)

    潘利武; 史涛涛; 孙军威

    2013-01-01

    针对大功率空压机电机后备保护装置中传统纵联差动保护的缺陷,提出采用磁平衡式差动保护.详细描述了该保护装置的基本原理和特性,并将两种保护措施做了比较.在实际应用中,磁平衡式差动保护体现了巨大的经济效益和社会效益,并验证了该方法的灵敏度和可靠性.%Considering the defects of traditional longitudinal differential protection device in high power air comressor motor,a method of magnetic balanced differential protection was proposed.The basic principles and characteristics of this protective device were described in detail and compared with traditional longitudinal differential protection device.In practical applications,the magnetic balance differential protection reflects enormous economic and social benefits,and the sensitivity and reliability of the method were validated.

  9. EXPERIMENTAL INVESTIGATION OF PARAMETERS EFFECTING THE NOISE REDUCTION IN HERMITICALLY SEALED RECIPROCATING COMPRESSOR

    Directory of Open Access Journals (Sweden)

    G.Laxmaiah

    2011-07-01

    Full Text Available Hermetic reciprocating compressors are most commonly used in the refrigeration industry. The main source of noise in refrigerating and air conditioning machinery is the compressor. Reduction of noise in compressors is a complex criterion as many factors such as Shell Thickness, Shell Material, Suction Port Area and Discharge Port Area etc. contribute its effect on the noise and they also interact in a complex manner. In this work a screening test is carried out to find the relative effect of the parameters and their interaction, which can be used as an initial step for further investigations concentrating on the most influencing parameters and their interactions using Taguchi Technique. Here Shell Thickness (ST, Shell Material (SM, Suction Port Area (SPA and Discharge Port Area (DPA are chosen as input parameters and the noise is the output parameter. L8 orthogonal array is selected, the factors are assigned and experiments are carried out. Column effect method is used to find the most effective parameters for the noise reduction in the compressor.

  10. Performance of vapor compression systems with compressor oil flooding and regeneration

    Energy Technology Data Exchange (ETDEWEB)

    Bell, Ian H.; Groll, Eckhard A.; Braun, James E. [Purdue University, Department of Mechanical Engineering, 140 S. Martin Jischke Drive, West Lafayette, IN 47906 (United States)

    2011-01-15

    Vapor compression refrigeration technology has seen great improvement over the last several decades in terms of cycle efficiency through a concerted effort of manufacturers, regulators, and research engineers. As the standard vapor compression systems approach practical limits, cycle modifications should be investigated to increase system efficiency and capacity. One possible means of increasing cycle efficiency is to flood the compressor with a large quantity of oil to achieve a quasi-isothermal compression process, in addition to using a regenerator to increase refrigerant subcooling. In theory, compressor flooding and regeneration can provide a significant increase in system efficiency over the standard vapor compression system. The effectiveness of compressor flooding and regeneration increases as the temperature lift of the system increases. Therefore, this technology is particularly well suited towards lower evaporating temperatures and high ambient temperatures as seen in supermarket refrigeration applications. While predicted increases in cycle efficiency are over 40% for supermarket refrigeration applications, this technology is still very beneficial for typical air-conditioning applications, for which improvements in cycle efficiency greater than 5% are predicted. It has to be noted though that the beneficial effects of compressor flooding can only be realized if a regenerator is used to exchange heat between the refrigerant vapor exiting the evaporator and the liquid exiting the condenser. (author)

  11. Advanced electric heat pump dual-stroke compressor and system development

    Science.gov (United States)

    Veyo, S. E.; Fagan, T. J.

    1983-12-01

    The development of an advanced electric heat pump is discussed. A two-capacity, residential, advanced electric heat pump utilizing a unique dual-stroke compressor was developed. Two nearly identical preprototype split systems of nominally 3.5 tons maximum cooling capacity were designed, built and laboratory tested. The estimated annual energy efficiency of this advanced system is 20 percent better than a two-speed electric heat pump available at contract inception in 1979. This superior performance is due to the synergism of a high-efficiency, dual-stroke reciprocating compressor, a dual-strength high-efficiency single-speed single-phase hermetic drive motor, a single-width, single-entry high-efficiency indoor blower with backward curved cambered plate blades, a high-efficiency multivane axial flow outdoor fan, high-efficiency two-speed air mover motors and a microprocessor control system. The relative proportions of heat exchangers, air flows and compressor size as well as the ratio between high and low capacity were optimized so as to minimize the annual cost of ownership in a northern climate. Constraints placed upon the optimization and design process to ensure comfort provide heating air with a temperature of at least 90(0)F and provide cooling with a sensible-to-total capacity ratio of not more than 0.7. System performance was measured in the laboratory in accordance with applicable codes and procedures. Performance data plus hardware details are provided.

  12. Study on Efficiency Improvement of Hermetic Rotary Compressors

    Science.gov (United States)

    Matsushima, Masatoshi; Nomura, Tomohiro; Nishimura, Nobuya; Iyota, Hiroyuki; Inaba, Koichi

    This research was conducted in order to better identify the torque loss of a hermetic rotary compressor for one revolution, and to directly obtain the actual shaft power of the compressor. A testing compressor and a gas cycle type simplified calorimeter were developed for direct measurement of the compressor torque. A strain gauge was stuck on the shaft between a compressor and a motor. Thus, the compressor torque could be measured directly by the strain gauge and data were transmitted to out of the compressor's vessel through a slip ring. Rotational speed of the compressor was measured by using a gap sensor also. From these measurement results, actual shaft power was calculated experimentally. On the other hand, effective compressive torque for compressing refrigerant gas was predicted theoretically. From both experimental and theoretical results, torque loss of the compressor was determined as the difference of the compressor torque from the effective compressive torque. Consequently, a loss of over-compression could be revealed from the torque loss experimentally. Furthermore, overall adiabatic efficiencies of compressors obtained by the actual shaft power were 1.1∼3.5% higher than former overall adiabatic efficiencies obtained by the motor output.

  13. Compressor Foundation Analysis Tool(COFANTO)

    NARCIS (Netherlands)

    Eijk, A.; Lentzen, S.S.K; Zuada Coelho, B.E.; Galanti, F.M.B.

    2012-01-01

    Reciprocating compressors are generally supported on a heavy concrete foundation. In spite of the large inertia and stiffness of the foundation, problems can occur due to interaction between the mechanical installation and the foundation. Two types of problems may occur. In the first type, the inter

  14. Knowledge Based Design of Axial Flow Compressor

    Directory of Open Access Journals (Sweden)

    Dinesh kumar.R

    2015-05-01

    Full Text Available In the aerospace industry with highly competitive market the time to design and delivery is shortening every day. Pressure on delivering robust product with cost economy is in demand in each development. Even though technology is older, it is new for each customer requirement and highly non-liner to fit one in another place. Gas turbine is considered one of a complex design in the aircraft system. It involves experts to be grouped with designers of various segments to arrive the best output. The time is crucial to achieve a best design and it needs knowledge automation incorporated with CAD/CAE tools. In the present work an innovative idea in the form of Knowledge Based Engineering for axial compressor is proposed, this includes the fundamental design of axial compressor integrated with artificial intelligence in the form of knowledge capturing and programmed with high level language (Visual Basis.Net and embedded into CATIA v5. This KBE frame work eases out the design and modeling of axial compressor design and produces 3D modeling for further flow simulation with fluid dynamic in Ansys-Fluent. Most of the aerospace components are developed through simulation driven product development and in this case it is established for axial compressor.

  15. Positive feedback stabilization of centrifugal compressor surge

    NARCIS (Netherlands)

    Willems, Frank; Heemels, W.P.M.H.; Jager, de Bram; Stoorvogel, Anton A.

    2002-01-01

    Stable operation of axial and centrifugal compressors is limited towards low mass flows due to the occurrence of surge. The stable operating region can be enlarged by active control. In this study, we use a control valve which is fully closed in the desired operating point and only opens to stabiliz

  16. Measurements of satellite refrigerator compressor power consumption and efficiency

    International Nuclear Information System (INIS)

    Each of the thirty compressors installed around the ring and at switchyard is an oil-injected, two-stage, Mycom screw compressor, driven by either a 350 hp or 400 hp motor. The reader is referred to TM1198 by John Satti for a detailed description of these compressors and the associated equipment. Since the power consumed by these compressors is a major operating expense for our accelerator, we were interested in measuring the power consumption and efficiency of our compressors. Two compressors were studied in detail - one having a GE 350 hp motor (F0 No. 2) and one a new GE 400 hp high efficiency motor (F0 No. 1). Data were taken for each compressor with the high stage always fully loaded. These data and values calculated from the data are tabulated

  17. Comparison of CFD results for a supercritical CO{sub 2} compressor with compressible and incompressible working fluids

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Seong Gu; Baik, Seungjoon; Cho, Seong Kuk; Lee, Jeong Ik [KAIST, Daejeon (Korea, Republic of); Kwon, Jinsu [Hanyang University, Seoul (Korea, Republic of)

    2015-10-15

    The authors compared flow parameters of S-CO{sub 2} compressor with various fluids to investigate fluid characteristic of S-CO{sub 2}, and performance of pump-derived type (shrouded impeller) compressor. The CFD results showed that the isentropic efficiency of CO{sub 2} case has a comparable performance in comparison to the water since S-CO{sub 2} has a meta-incompressible characteristic near the critical point. Because of the low rotating speed and non-optimized geometry of impeller, the pressure ratio of the compressor is low. However, the authors confirmed that this shrouded type impeller for S-CO{sub 2} compressor showed good performance as much as water case. This results will be reflected in the future S-CO{sub 2} compressor design. As the generation IV reactors are being researched, the supercritical carbon dioxide (S-CO{sub 2}) Brayton cycle is identified as one of the promising power conversion cycles. The S-CO{sub 2} cycle has several advantages: high efficiency it has compact cycle components and simple layout. It can be also used for a power conversion system of sodium-cooled fast reactor (SFR) since it can eliminate potential safety issue of the sodium-water reactions. Moreover, the S-CO{sub 2} cycle can be used for small modular reactors (SMR) application since it occupies small footprint and it can designed as an economical dry-cooling system for SMRs. Design of a compressor is the major technical issue in development of S-CO{sub 2} cycle. Main purposes of this experiment are to accumulate operating experience of the S-CO{sub 2} loop, and to obtain fundamental data for the compressor design optimization near the critical point. However, inside the compressor, it is hard to know flow parameters by measurements. Therefore, the authors performed a CFD analysis to obtain useful flow parameters inside the compressor. The main goal of this paper is studying the flow parameters of pump-derived type compressor with S-CO{sub 2}, water, and air fluids to

  18. Modeling the Deterioration of Engine and Low Pressure Compressor Performance During a Roll Back Event Due to Ice Accretion

    Science.gov (United States)

    Veres, Joseph P.; Jorgenson, Philip, C. E.; Jones, Scott M.

    2014-01-01

    The main focus of this study is to apply a computational tool for the flow analysis of the engine that has been tested with ice crystal ingestion in the Propulsion Systems Laboratory (PSL) of NASA Glenn Research Center. A data point was selected for analysis during which the engine experienced a full roll back event due to the ice accretion on the blades and flow path of the low pressure compressor. The computational tool consists of the Numerical Propulsion System Simulation (NPSS) engine system thermodynamic cycle code, and an Euler-based compressor flow analysis code, that has an ice particle melt estimation code with the capability of determining the rate of sublimation, melting, and evaporation through the compressor blade rows. Decreasing the performance characteristics of the low pressure compressor (LPC) within the NPSS cycle analysis resulted in matching the overall engine performance parameters measured during testing at data points in short time intervals through the progression of the roll back event. Detailed analysis of the fan-core and LPC with the compressor flow analysis code simulated the effects of ice accretion by increasing the aerodynamic blockage and pressure losses through the low pressure compressor until achieving a match with the NPSS cycle analysis results, at each scan. With the additional blockages and losses in the LPC, the compressor flow analysis code results were able to numerically reproduce the performance that was determined by the NPSS cycle analysis, which was in agreement with the PSL engine test data. The compressor flow analysis indicated that the blockage due to ice accretion in the LPC exit guide vane stators caused the exit guide vane (EGV) to be nearly choked, significantly reducing the air flow rate into the core. This caused the LPC to eventually be in stall due to increasing levels of diffusion in the rotors and high incidence angles in the inlet guide vane (IGV) and EGV stators. The flow analysis indicating

  19. Odessa pumps now certified on Blackmer compressors

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2009-09-15

    Some quantity of product recovered from wellheads and tank batteries will undoubtedly escape, be vented or flared off into the atmosphere. In order to solve this problem, field operators are considering the use of vapour-recovery units (VRUs) at the wellhead. To date, only 7,000 to 9,000 VRUs have been installed in the oil and natural gas production sector in the United States. Blackmer, a global supplier of reciprocating-compressor technology, is working through Odessa Pumps to promote the use of its HD and NG Series Oil-Free Reciprocating Gas Compressors. Odessa Pumps is a specialist in providing turnkey solutions for many types of pump and compressor applications. Blackmer's non-lubricated designs provide a full distance piece compartment between the cylinder and crankcase. This allows the user maximum control of any vapours that would normally vent into the crankcase uncontrollably on other designs. Blackmer conducted onsite product training at Odessa offices throughout Texas to introduce the key features and benefits that the units can offer in the field. In addition to their environmental advantages in the oilfield for vapour recovery, there is also an economic benefit. Some operators who have installed Blackmer compressors at their wellheads have made back the cost of the unit from the sale of recovered gas and increased oil production in less than 11 days. Blackmer HD and NG Series Reciprocating Gas Compressors are available in either single- or two-stage configurations. They have been designed for maximum performance and reliability under the most severe operating conditions. 1 fig.

  20. Effect of self recirculation casing treatment on the performance of a turbocharger centrifugal compressor

    Science.gov (United States)

    Gancedo, Matthieu

    Increase in emission regulations in the transport industry brings the need to have more efficient engines. A path followed by the automobile industry is to downsize the size of the internal combustion engine and increase the air density at the intake to keep the engine power when needed. Typically a centrifugal compressor is used to force the air into the engine, it can be powered from the engine shaft (superchargers) or extracting energy contained into the hot exhaust gases with a turbine (turbochargers). The flow range of the compressor needs to match the one of the engine. However compressors mass flow operating range is limited by choke on the high end and surge on the low end. In order to extend the operation at low mass flow rates, the use of passive devices for turbocharger centrifugal compressors was explored since the late 80's. Hence, casing treatments including flow recirculation from the inducer part of the compressor have been shown to move the surge limit to lower flows. Yet, the working mechanisms are still not well understood and thus, to optimize the design of this by-pass system, it is necessary to determine the nature of the changes induced by the device both on the dynamic stability of the pressure delivery and on the flow at the inlet. The compressor studied here features a self-recirculating casing treatment at the inlet. The recirculation passage could be blocked to carry a direct comparison between the cases with and without the flow feature. To grasp the effect on compressor stability, pressure measurements were taken in the different constituting elements of the compressor. The study of the mean pressure variations across the operating map showed that the tongue region is a limiting element. Dynamic pressure measurements revealed that the instabilities generated near the inducer when the recirculation is blocked increase the overall instability levels at the compressor outlet and propagating pressure waves starting at the tongue occurred

  1. Prediction of Cracking Gas Compressor Performance and Its Application in Process Optimization

    Institute of Scientific and Technical Information of China (English)

    李绍军; 李凤

    2012-01-01

    Cracking gas compressor is usually a centrifugal compressor. The information on the performance of a centrifugal compressor under all conditions is not available, which restricts the operation optimization for compressor. To solve this problem, two back propagation (BP) neural networks were introduced to model the performance of a compressor by using the data provided by manufacturer. The input data of the model under other conditions should be corrected according to the similarity theory. The method was used to optimize the system of a cracking gas compressor by embedding the compressor performance model into the ASPEN PLUS model of compressor. The result shows that it is an effective method to optimize the compressor system.

  2. A theoretical and experimental study of a novel refrigerant compressor

    Science.gov (United States)

    Eames, I. W.

    A refrigerant compressor concept was envisaged consisting of a small scale centrifugal compressor driven by a high frequency induction motor on a common shaft with an impeller supported in aerodynamic bearings. The combination of state-of-the-art compressor, bearing and motor technologies potentially provides refrigerator designers with improved system performance and better compressor reliability with significant reductions in weight and physical size at reduced capital and running costs. A detailed description of the prototype compressor unit is included. The concept is compared with conventional compressor systems, and key areas of research requiring detailed investigation are identified. The following are described and/or evaluated: (1) the results of a literature survey into performance of centrifugal compressors; (2) the electric motor; (3) an investigation into the design of the drive shaft and bearing assemblies; (4) external and internal sources of machine vibration; (5) the manufacture of the prototype compressor unit; (6) testing of the compressor unit; (7) development problems encountered during testing; and (8) a computer simulation study of the behavior of a refrigeration system incorporating the prototype compressor. Aspects of the manufacture considered include surface finishes, tolerancing, heat treatments, and balancing processes.

  3. Kinetic characteristic for a synchronal rotary compressor

    Institute of Scientific and Technical Information of China (English)

    Qu Zongchang; Feng Jianmei; Zhou Hui; Yang Hua

    2007-01-01

    An angular speed, acceleration and tangential leakage of a synchronal rotary compressor in which both bladed rotor and a cylinder are discussed. The calculation formulae of revolving speed of cylinder and relative speed between the cylinder and bladed rotor are deduced detailedly in this paper. The variation of tangential speed and cylinder acceleration with angular position is investigated for a complete cycle. And some key parameters affected the relative speed are found out, viz, the relative speed depends on the radius of the cylinder and rotary speed of the axis, and the ratio of the cylinder to bladed rotor has not too much influence. It is the theoretic basis of designing and optimizing of structure characteristic of a synchronal rotary compressor. Also a computing formula of leakage related with rotary speed is deduced. It could supply

  4. High stability design for new centrifugal compressor

    Science.gov (United States)

    Kanki, H.; Katayama, K.; Morii, S.; Mouri, Y.; Umemura, S.; Ozawa, U.; Oda, T.

    1989-01-01

    It is essential that high-performance centrifugal compressors be free of subsynchronous vibrations. A new high-performance centrifugal compressor has been developed by applying the latest rotordynamics knowledge and design techniques: (1) To improve the system damping, a specially designed oil film seal was developed. This seal attained a damping ratio three times that of the conventional design. The oil film seal contains a special damper ring in the seal cartridge. (2) To reduce the destabilizing effect of the labyrinth seal, a special swirl canceler (anti-swirl nozzle) was applied to the balance piston seal. (3) To confirm the system damping margin, the dynamic simulation rotor model test and the full load test applied the vibration exciting test in actual load conditions.

  5. Aerodynamic reconfiguration and multicriterial optimization of centrifugal compressors – a case study

    Directory of Open Access Journals (Sweden)

    Valeriu DRAGAN

    2014-12-01

    Full Text Available This paper continues the recent research of the author, with application to 3D computational fluid dynamics multicriterial optimization of turbomachinery parts. Computational Fluid Dynamics has been an ubicuous tool for compressor design for decades, helping the designers to test the aerodynamic parameters of their machines with great accuracy. Due to advances of multigrid methods and the improved robustness of structured solvers, CFD can nowadays be part of an optimization loop with artificial neural networks or evolutive algorithms. This paper presents a case study of an air centrifugal compressor rotor optimized using Numeca's Design 3D CFD suite. The turbulence model used for the database generation and the optimization stage is Spalart Allmaras. Results indicate a fairly quick convergence time per individual as well as a good convergence of the artificial neural network optimizer.

  6. Surge and stall in centrifugal compressors

    Science.gov (United States)

    Vandenbraembussche, R.

    Surge and stall are defined, and experimental and theoretical investigations of surge in compressors, stall in vaned flow passages, and stall in vaneless flow passages are reviewed. Ways to delay surge and stall are outlined. Actions to influence the surge limit during design or to correct for an eventual misprediction often decrease efficiency when the range has to be increased. The main action to avoid surge and stall is a safe design of impeller and diffuser and a correct matching of both components.

  7. Risk Based Maintenance for Compressor Systems

    OpenAIRE

    Marquesin De Oliveira, Nathalie

    2015-01-01

    This thesis reviewed part of the maintenance activities in a compressor system using the risk based maintenance philosophy. The goal was to verify if a contribution could be made to the maintenance plan of the system. The risk based maintenance philosophy is applied according to the recommendations in NORSOK Z-008. A reliability model is proposed to verify the impact of the new maintenance approach and to make better informed decisions in the maintenance management process. The model used...

  8. Analysis and developpment of a Turbivo compressor for MRV applications

    CERN Document Server

    Ksayer, Elias Boulawz

    2010-01-01

    The mechanical vapor recompression is an efficient process to decrease energy consumption of drying processes. In order to use the mechanical vapor recompression (MVR) in residential clothe dryers, the volumetric Turbivo technology is used to design a dry water vapor compressor. The Turbivo volumetric machine is composed mainly of a rotor with one blade, a stator, and a mobile oscillating thrust. The advantages of Turbivo(R) technology are the absence of contact between rotor and stator as well as the oil-free operation. A model of the Turbivo compressor, including kinematic, dynamic, and thermodynamic analysis is presented. The compressor internal tightness is ensured by a surface treatment of the compressor components. Using the model, a water vapor Turbivo compressor of 12m3/h and compression ratio of 5 has been sized and realized. The compressor prototype will be tested on a dedicated test bench to characterize its volumetric and isentropic efficiencies.

  9. Object-oriented Technology for Compressor Simulation

    Science.gov (United States)

    Drummond, C. K.; Follen, G. J.; Cannon, M. R.

    1994-01-01

    An object-oriented basis for interdisciplinary compressor simulation can, in principle, overcome several barriers associated with the traditional structured (procedural) development approach. This paper presents the results of a research effort with the objective to explore the repercussions on design, analysis, and implementation of a compressor model in an object oriented (OO) language, and to examine the ability of the OO system design to accommodate computational fluid dynamics (CFD) code for compressor performance prediction. Three fundamental results are that: (1) the selection of the object oriented language is not the central issue; enhanced (interdisciplinary) analysis capability derives from a broader focus on object-oriented technology; (2) object-oriented designs will produce more effective and reusable computer programs when the technology is applied to issues involving complex system inter-relationships (more so than when addressing the complex physics of an isolated discipline); and (3) the concept of disposable prototypes is effective for exploratory research programs, but this requires organizations to have a commensurate long-term perspective. This work also suggests that interdisciplinary simulation can be effectively accomplished (over several levels of fidelity) with a mixed language treatment (i.e., FORTRAN-C++), reinforcing the notion the OO technology implementation into simulations is a 'journey' in which the syntax can, by design, continuously evolve.

  10. Numerical simulation of piston leakage over hermetic reciprocating compressors behavior.

    OpenAIRE

    Rigola Serrano, Joaquim; Pérez Segarra, Carlos David; Oliva Llena, Asensio

    2009-01-01

    Instantaneous flow leakage between piston and cylinder is numerically evaluated. Reynolds equation is solved to calculate the pressure leakage distribution through the piston in the compressor. Piston movement inside the cylinder is simulated from kinematic analysis of the connecting rod mechanical system and the respective force balances. An updated version of this model is here presented for different working range compressors and fluid refrigerants compressor chamber pressures distribution...

  11. Performance and Operating Characteristics of a Novel Rotating Spool Compressor

    OpenAIRE

    Orosz, Joe; Kemp, Greg; Bradshaw, Craig; Eckhard A. Groll

    2012-01-01

    The basic mechanism of the novel rotary spool compressor has been described previously by Kemp et al. (2008, 2010). The device combines various aspects of rotary and reciprocating devices currently well understood to achieve high efficiency at a low manufacturing cost. A dimensionless variable, the Zsoro number, is developed which represents the ratio of the geometric configuration of the compressor relative to the potential friction components of the compressor. This number allows for rapid ...

  12. Real-time trend monitoring of gas compressor stations

    Energy Technology Data Exchange (ETDEWEB)

    Van Hardeveld, T. (Nova, an Alberta Corp., AB (Canada))

    1991-02-01

    The authors' company has developed a machinery health monitoring system (MHealth) for short-term and long-term historical trending and analysis of data from its 40 gas compressor stations. The author discusses the benefits of real-time trending in troubleshooting operations, in preventative maintenance scheduling and cites specific applications in the startup operations of several new gas compressor/centrifugal compressor units.

  13. IC ENGINE SUPERCHARGING AND EXHAUST GAS RECIRCULATION USING JET COMPRESSOR

    OpenAIRE

    Adhimoulame Kalaisselvane; Natarajan Alagumurthy; Krishnaraj Palaniradja; G Selvaraj Gunasegarane

    2010-01-01

    Supercharging is a process which is used to improve the performance of an engine by increasing the specific power output whereas exhaust gas recirculation reduces the NOx produced by engine because of supercharging. In a conventional engine, supercharger functions as a compressor for the forced induction of the charge taking mechanical power from the engine crankshaft. In this study, supercharging is achieved using a jet compressor. In the jet compressor, the exhaust gas is used as the motive...

  14. Centrifugal Compressor Load Sharing with the use of MPC

    OpenAIRE

    Overvåg, Thomas Ferstad

    2013-01-01

    The work presented in this thesis examines the possibilities of having compressors running in an optimal manner which can result in energy savings. This research looks at how a compressor operates and the problems which can occur when connecting several machines, both in series and parallel. It is mainly focused on using Model Predictive Control (MPC), as a setup for controlling each compressor to a fixed operating point on the characteristic with relation to mass flow and pressure. Constrain...

  15. On the Development of an Efficient Regenerative Compressor

    OpenAIRE

    Griffini, D.; Salvadori, S.; Carnevale, M.; A. Cappelletti; Ottanelli, L.; Martelli, F.

    2015-01-01

    Regenerative compressors are attractive machines used in several industrial processes. Their main characteristic is the highly three-dimensional development of the flow. Consequently, usual approach for axial or centrifugal compressors design are not an affordable strategy. The analysis of the rotor/stator coupling is the main issue in the design of regenerative compressors because of the vane-less nature of the stator and the characteristic trajectory of the flow. This paper describes the de...

  16. A Valve Design Methodology For Improved Reciprocating Compressor Performance

    OpenAIRE

    Bhakta, Aditya; Dhar, Sandeep; Bahadur, Vaibhav; Angadi, Shruti; Dey, Subhrajit

    2012-01-01

    The current work directly relates valve dynamics to the compressor energy efficiency. Majority of the previous studies have focused on reducing pressure losses due to valve geometry, towards improved compressor performance. On a complimentary note, analyzing the valve ‘flutter’ leads to a holistic valve development methodology. Traditionally, pressure actuated reed valves have been used in reciprocating hermetic compressors on the suction and discharge ports. A characteristic of these valve ...

  17. Study on the Oil Supply System for Rotary Compressors

    Science.gov (United States)

    Ito, Takahide; Kobayashi, Hiroyuki; Fujitani, Makoto; Murata, Nobuo

    Research has been undertaken to clarify the shaft oil pump mechanisms and oil supply network systems for rotary compressors. Numerical expressions were developed for each part of the rotary compressor,(such as drive shaft,oil pump and journal bearing grooves)in order to confirm that the calculated values agree with the experimental results. Finally,a computer program has been developed to evaluate the oil supply system performance under steady conditions for rotary compressors.

  18. Commande d'un compresseur centrifuge à vitesse ultra-haute pour la gestion de l'air du système de piles à combustible

    OpenAIRE

    Zhao, Dongdong

    2013-01-01

    Air compressor supplying the oxygen to the stack is an important component in the fuel cell systems. The compressor can consumes up to 20 % of the generated power in the most severe cases. The selecting of the compressor and corresponding control are directly related to the performance of the fuel cell. The size and weight of the air compressor has to be reduced to make them more feasible for automotive applications. Moreover, the control of the air compression system is also an important iss...

  19. Small variable speed hermetic reciprocating compressors for domestic refrigerators

    DEFF Research Database (Denmark)

    Rasmussen, Bjarne D.

    1996-01-01

    This paper contains both a theoretical and experimental investigation of some of the fundamental characteristics of a smal variable speed hermetic reciprocating compressor intended for application in domestic refrigeration. The results of a previously published simulation model for variable speed...... compressors are compared with experimental results obtained in a compressor test bench. The influence of speed on compressor performance is discussed with focus on valve modelling and internal thermal phenomena. Further plans for development and validation of the model as well as experimental investigations...

  20. Analysis of the Thermodynamical Efficiency of an Air Handling Unit with a Heat Pump

    OpenAIRE

    Vytautas Martinaitis; Paulius Bareika; Violeta Misevičiūtė

    2012-01-01

    This paper evaluates the seasonal thermodynamic efficiency of the air-to-air heat pump used for a heat recovery ventilation system and several modulations of compressors affecting the thermodynamic efficiency of the heat pump. A variable speed and on/off-type compressors have been selected. In order to evaluate the thermodynamic potential of the device, energy analysis has been performed. Along with modelling the operation of the air handling unit during the cold time of the year, variations ...

  1. Cooling Performance Characteristics on Mobile Air-Conditioning System for Hybrid Electric Vehicles

    OpenAIRE

    Ho-Seong Lee; Moo-Yeon Lee

    2013-01-01

    This study investigates the cooling performance characteristics of the mobile air-conditioning system using R744 (CO2) for the hybrid electric vehicle as an alternative to both the R-134a and the conventional air-conditioning system. The developed air-conditioning system is operated with an electric driven compressor in the battery driving mode and a belt driven compressor in the engine driving mode. The cooling performance characteristics of the developed system have been analyzed by experim...

  2. Fuel efficiency, availability and compressor station configuration

    Energy Technology Data Exchange (ETDEWEB)

    Lubomirsky, Matt; Kurz, Rainer [Solar Turbines Inc., San Diego, CA (United States); Klimov, Pavel [Intergas Central Asia, Astana (Kazakhstan)

    2009-12-19

    Compressor stations play a very important role in the success of a gas pipeline design and a careful selection of centrifugal compressors and drivers are key aspects for the success of the project. The state of the art design available today for this equipment provides overall high thermodynamic performance and consequently minimizes installed power requirements and energy usage with significant savings on operating expenses during the economic life of the project For any application of machinery in a pipeline compression station, one of the key questions to answer is the number of units to install to meet the flow requirements of the pipeline. Depending on the load profile of the pipeline, the answers may look different. Other factors to consider include the fact that gas turbines can produce a significant amount of additional power at lower ambient temperatures. So, even for constant load of the pipeline, the relative load of the driver changes. In this paper, a typical transcontinental pipeline with multiple compressor stations is evaluated. The determination of the exact hydraulic behavior of the pipeline is part of the modeling effort. The site ambient conditions, with a significant swing in ambient temperatures are considered. The issue discussed in this paper evolves around the availability that can be achieved with various configurations, based on actually achieved reliability and availability numbers. The other large impact on operating costs, fuel consumption will be discussed. Here, the choice of the number of installed units has a distinct impact on annual fuel consumption, as well as the capacity of the pipeline during various scenarios. (author)

  3. Axial and Centrifugal Compressor Mean Line Flow Analysis Method

    Science.gov (United States)

    Veres, Joseph P.

    2009-01-01

    This paper describes a method to estimate key aerodynamic parameters of single and multistage axial and centrifugal compressors. This mean-line compressor code COMDES provides the capability of sizing single and multistage compressors quickly during the conceptual design process. Based on the compressible fluid flow equations and the Euler equation, the code can estimate rotor inlet and exit blade angles when run in the design mode. The design point rotor efficiency and stator losses are inputs to the code, and are modeled at off design. When run in the off-design analysis mode, it can be used to generate performance maps based on simple models for losses due to rotor incidence and inlet guide vane reset angle. The code can provide an improved understanding of basic aerodynamic parameters such as diffusion factor, loading levels and incidence, when matching multistage compressor blade rows at design and at part-speed operation. Rotor loading levels and relative velocity ratio are correlated to the onset of compressor surge. NASA Stage 37 and the three-stage NASA 74-A axial compressors were analyzed and the results compared to test data. The code has been used to generate the performance map for the NASA 76-B three-stage axial compressor featuring variable geometry. The compressor stages were aerodynamically matched at off-design speeds by adjusting the variable inlet guide vane and variable stator geometry angles to control the rotor diffusion factor and incidence angles.

  4. Compressor Study to Meet Large Civil Tilt Rotor Engine Requirements

    Science.gov (United States)

    Veres, Joseph P.

    2009-01-01

    A vehicle concept study has been made to meet the requirements of the Large Civil Tilt Rotorcraft vehicle mission. A vehicle concept was determined, and a notional turboshaft engine system study was conducted. The engine study defined requirements for the major engine components, including the compressor. The compressor design-point goal was to deliver a pressure ratio of 31:1 at an inlet weight flow of 28.4 lbm/sec. To perform a conceptual design of two potential compressor configurations to meet the design requirement, a mean-line compressor flow analysis and design code were used. The first configuration is an eight-stage axial compressor. Some challenges of the all-axial compressor are the small blade spans of the rear-block stages being 0.28 in., resulting in the last-stage blade tip clearance-to-span ratio of 2.4 percent. The second configuration is a seven-stage axial compressor, with a centrifugal stage having a 0.28-in. impeller-exit blade span. The compressors conceptual designs helped estimate the flow path dimensions, rotor leading and trailing edge blade angles, flow conditions, and velocity triangles for each stage.

  5. DESIGN PARAMETERS OF CENTRIFUGAL COMPRESSOR INDUCER

    Directory of Open Access Journals (Sweden)

    Saim KOÇAK

    1998-03-01

    Full Text Available Design characteristics of centrifugal compressor impellers working with compressible fluids are analyzed, and the design parameters of inducer are defined. The effects of incidence, deviation and deflection angles, relative eddy, rotating stall and Mach number are investigated. The relation between minimum relative Mach number of inducer and flow angle is investigated and it is observed that the minimum Mach number occurs for flow angle values between -680 and -520 . In the design, the effect of a 100 difference in flow angle is found to be less than 1 % on minimum relative Mach number.

  6. Compressor Calorimeter Test of R-410A Alternatives R-32, DR-5, and L-41a

    Energy Technology Data Exchange (ETDEWEB)

    Shrestha, Som S [ORNL; Mahderekal, Isaac [ORNL; Sharma, Vishaldeep [ORNL; Abdelaziz, Omar [ORNL

    2013-02-01

    As a contribution to the AHRI Low-GWP Alternative Refrigerants Evaluation Program (AREP), this study compares performance of alternative refrigerants R32, DR-5, and L-41A to that of refrigerant R-410A (baseline) in a scroll compressor designed for air-conditioning and heat pump applications. Compressor calorimeter tests were performed to evaluate the performance of the lower-GWP alternative refrigerants in place of the common refrigerant R-410A in a 36,000 Btu/hr compressor calorimeter using a compressor having a nominal rated capacity of 21,300 Btu/hr. Tests were conducted over a suction dew point temperature range of 10 F to 55 F in 5 F increments and a discharge dew point temperature range of 70 F to 140 F in 10 F increments. All the tests were performed with 20 F superheat, 40 F superheat and 65 F suction temperature. A liquid subcooling level of 15 F was maintained for all the test conditions. The tests showed that performance of these three lower-GWP alternative refrigerants is comparable to that of R-410A. For the 20 F superheat and 15 F subcooling test conditions, EERs of R32, DR-5, and L-41A were 90% to 99%, 96% to 99%, and 94% to 101%, respectively, compared to that of R-410A. Similarly, cooling capacities of R32, DR-5, and L-41A were 98% to 103%, 92% to 96%, and 84% to 92%, respectively, compared to that of R-410A.

  7. Factory acceptance of the compressor skids at Samifi-Babcock. All pictures show the second stage compressor skid.

    CERN Multimedia

    G. Perinic

    2001-01-01

    Most recent pictures taken during the factory acceptance of the compressor skids at Samifi-Babcock. All pictures show the second stage compressor skid. Picture two was taken during the leak tests and shows all the pockets around flanges and valves.

  8. High Efficiency Centrifugal Compressor for Rotorcraft Applications

    Science.gov (United States)

    Medic, Gorazd; Sharma, Om P.; Jongwook, Joo; Hardin, Larry W.; McCormick, Duane C.; Cousins, William T.; Lurie, Elizabeth A.; Shabbir, Aamir; Holley, Brian M.; Van Slooten, Paul R.

    2014-01-01

    The report "High Efficiency Centrifugal Compressor for Rotorcraft Applications" documents the work conducted at UTRC under the NRA Contract NNC08CB03C, with cost share 2/3 NASA, and 1/3 UTRC, that has been extended to 4.5 years. The purpose of this effort was to identify key technical barriers to advancing the state-of-the-art of small centrifugal compressor stages; to delineate the measurements required to provide insight into the flow physics of the technical barriers; to design, fabricate, install, and test a state-of-the-art research compressor that is representative of the rear stage of an axial-centrifugal aero-engine; and to acquire detailed aerodynamic performance and research quality data to clarify flow physics and to establish detailed data sets for future application. The design activity centered on meeting the goal set outlined in the NASA solicitation-the design target was to increase efficiency at higher work factor, while also reducing the maximum diameter of the stage. To fit within the existing Small Engine Components Test Facility at NASA Glenn Research Center (GRC) and to facilitate component re-use, certain key design parameters were fixed by UTRC, including impeller tip diameter, impeller rotational speed, and impeller inlet hub and shroud radii. This report describes the design effort of the High Efficiency Centrifugal Compressor stage (HECC) and delineation of measurements, fabrication of the compressor, and the initial tests that were performed. A new High-Efficiency Centrifugal Compressor stage with a very challenging reduction in radius ratio was successfully designed, fabricated and installed at GRC. The testing was successful, with no mechanical problems and the running clearances were achieved without impeller rubs. Overall, measured pressure ratio of 4.68, work factor of 0.81, and at design exit corrected flow rate of 3 lbm/s met the target requirements. Polytropic efficiency of 85.5 percent and stall margin of 7.5 percent were

  9. Modeling Mist to Annular Flow Development in the Discharge of a Compressor

    OpenAIRE

    Wujek, Scott S.; Hrnjak, Predrag S.

    2012-01-01

    A model has been created to describe the development of flow leaving a compressor as it transitions from mist to annular flow. Flow parameters such as the drop size, drop speed, drop concentration, film thickness, and film velocity change as a function of length. Parameters such as refrigerant flow rates, oil in circulation ratios, and fluid properties are accounted for in these models. While some flow development work is found in the open literature for air-water or steam-water flows, little...

  10. STUDY ON THERMODYNAMIC MODEL OF A COMPRESSOR WITH ARTIFICIAL NEURAL NETWORKS

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    A new compressor thermodynamic model is set up. Artificial neural networks(ANN) which have self-adjusting functions are adopted to calculate volumetric efficiency and electrical efficiency of a compressor. The new compressor model composed of the theoretical model and ANN reaches more precise results than traditional ones. Furthermore, the new compressor model is of better flexibility in a large scale.

  11. Solid deposition in the ITER cryogenic viscous compressor

    Science.gov (United States)

    Zhang, Dongsheng; Miller, Franklin K.; Pfotenhauer, John M.

    2016-09-01

    A transient model for the ITER cryogenic viscous compressor (CVC) is presented. The CVC is designed to separate hydrogen isotopes from helium in the gas-mixture exhaust from the ITER torus. During their residence in the CVC, hydrogen isotopes are captured along the pump wall while helium flows through. The CVC thereby provides the first stage of helium compression. The transient model characterizes the transport phenomena (species, momentum, and energy) that occur in the CVC. The numerical results are compared with experimental data from a scaled down test of the ITER CVC using pure hydrogen. Although the model has been developed for a hydrogen-helium mixture, it is simplified here in order to compare with the experimental data. The transient model, along with other numerical models we have developed, provide guidance for the design and optimization of the ITER CVC. The model can also be a useful tool or a reference for similar analyses, such as those for cryogenic carbon capture and air ingress in vacuum isolated cryogenic vessels.

  12. Pressure Field Study of the Tevatron Cold Compressors

    Science.gov (United States)

    Klebaner, A. L.; Martinez, A.; Soyars, W. M.; Theilacker, J. C.

    2004-06-01

    The Fermilab Tevatron cryogenic system utilizes high-speed centrifugal cold compressors, manufactured by Ishikawajima-Harima Heavy Industries Co. Ltd. (IHI), for high-energy operations. The compressor is designed to pump 60 g/sec of 3.6 K saturated helium vapor at a pressure ratio of 2.8, with an off-design range of 40 to 70 g/sec. Operating speeds are between 40,000 and 95,000 rpm, with a speed of 80,000 rpm at the design point. Different heat loads and magnet quench performance of each of the twenty-four satellite refrigerators dictates different process pressure and flow rates of the cold compressors. Reducing the process flow rate can cause the centrifugal cold compressor to stop pumping and subsequently surge. Tests have been conducted at the Cryogenic Test Facility at Fermilab to map the pressure field and appropriate efficiency of the IHI hydrodynamic cold compressor. The information allows tuning of each of the twenty-four Tevatron satellite refrigerators to avoid cold compressor operation near the surge and choke lines. A new impeller has also been tested. The Tevatron cold compressor pressure field and efficiency data with the new impeller are presented in this paper.

  13. Core compressor exit stage study. 1: Aerodynamic and mechanical design

    Science.gov (United States)

    Burdsall, E. A.; Canal, E., Jr.; Lyons, K. A.

    1979-01-01

    The effect of aspect ratio on the performance of core compressor exit stages was demonstrated using two three stage, highly loaded, core compressors. Aspect ratio was identified as having a strong influence on compressors endwall loss. Both compressors simulated the last three stages of an advanced eight stage core compressor and were designed with the same 0.915 hub/tip ratio, 4.30 kg/sec (9.47 1bm/sec) inlet corrected flow, and 167 m/sec (547 ft/sec) corrected mean wheel speed. The first compressor had an aspect ratio of 0.81 and an overall pressure ratio of 1.357 at a design adiabatic efficiency of 88.3% with an average diffusion factor or 0.529. The aspect ratio of the second compressor was 1.22 with an overall pressure ratio of 1.324 at a design adiabatic efficiency of 88.7% with an average diffusion factor of 0.491.

  14. Efficiency of Compressed Air Energy Storage

    OpenAIRE

    Elmegaard, Brian; Brix, Wiebke

    2011-01-01

    The simplest type of a Compressed Air Energy Storage (CAES) facility would be an adiabatic process consisting only of a compressor, a storage and a turbine, compressing air into a container when storing and expanding when producing. This type of CAES would be adiabatic and would if the machines were reversible have a storage efficiency of 100%. However, due to the specific capacity of the storage and the construction materials the air is cooled during and after compression in practice, making...

  15. A study of occupant cooling by personally controlled air movement

    OpenAIRE

    Arens, Edward A.; Xu, T.; Miura, K; Zhang, H.; Fountain, M.; Bauman, Fred

    1997-01-01

    This study addresses the effectiveness of air movement cooling, an alternative to compressor-based cooling of the air itself. Subjects in an environmental chamber were exposed to a range of warm temperatures and allowed to adjust air movement to suit their individual preferences, while answering a series of questions about their comfort. Air movement was from the subject's side, in two modes of turbulent flow. The air speeds chosen by the subjects, and their subjective responses, are evaluate...

  16. Performance Analysis of Centrifugal Compressor under Multiple Working Conditions Based on Time-weighted Average

    OpenAIRE

    Zhao, Yuanyang; Xiao, Jun; Li, Liansheng; Yang, Qichao; Liu, Guangbin; Wang, Le; Tang, Bin

    2014-01-01

    A method of compressor performance analysis under multiple working conditions is present based on the Time-weighted average (TWA). The main operation parameters can be obtained based the estimate of the working conditions and times of compressors. Then the comprehensive analysis method can be used to get the overall performance of compressor. The performance of a basic centrifugal compressor was simulation by CFD method in this paper. The overall performance of the centrifugal compressor is c...

  17. DESIGN OF 8-4 AND 9-4 COMPRESSORS FORHIGH SPEED MULTIPLICATION

    OpenAIRE

    R. Marimuthu; Dhruv Bansal; Balamurugan, S.; P. S. Mallick

    2013-01-01

    This study presents higher order compressors which can be effectively used for high speed multiplications. The proposed compressors offer less delay and area. But the Energy Delay Product (EDP) is slightly higher than lower order compressors. The performance of 8Ã8, 16Ã16 and 24Ã24 multipliers using the proposed higher order compressors has been compared with the same multipliers using lower order compressors and found that the new structures can be used for high speed multiplications. These ...

  18. Turbine Engine with Differential Gear Driven Fan and Compressor

    Science.gov (United States)

    Suciu, Gabriel L. (Inventor); Pagluica, Gino J. (Inventor); Duong, Loc Quang (Inventor); Portlock, Lawrence E. (Inventor)

    2013-01-01

    A gas turbine engine provides a differential gear system coupling the turbine to the bypass fan and the compressor. In this manner, the power/speed split between the bypass fan and the compressor can be optimized under all conditions. In the example shown, the turbine drives a sun gear, which drives a planet carrier and a ring gear in a differential manner. One of the planet carrier and the ring gear is coupled to the bypass fan, while the other is coupled to the compressor.

  19. Design Method for Channel Diffusers of Centrifugal Compressors

    Directory of Open Access Journals (Sweden)

    Mykola Kalinkevych

    2013-01-01

    Full Text Available The design method for channel diffusers of centrifugal compressors, which is based on the solving of the inverse problem of gas dynamics, is presented in the paper. The concept of the design is to provide high pressure recovery of the diffuser by assuming the preseparation condition of the boundary layer along one of the channel surfaces. The channel diffuser was designed with the use of developed method to replace the vaned diffuser of the centrifugal compressor model stage. The numerical simulation of the diffusers was implemented by means of CFD software. Obtained gas dynamic characteristics of the designed diffuser were compared to the base vaned diffuser of the compressor stage.

  20. Some field experience with subsynchronous vibration of centrifugal compressors

    Science.gov (United States)

    Wang, Xi-Xuan; Gu, Jin-Chu; Shen, Qin-Gen; Hua, Yong-Li; Zhu, Lan-Sheng; Du, Yun-Tian

    1989-01-01

    A lot of large chemical fertilizer plants producing 1000 ton NH3/day and 1700 ton urea/day were constructed in the 1970's in China. During operation, subsynchronous vibration takes place occasionally in some of the large turbine-compressor sets and has resulted in heavy economic losses. Two cases of subsynchronous vibration are described: Self-excited vibration of the low-pressure (LP) cylinder of one kind of N2-H2 multistage compressor; and Forced subsynchronous vibration of the high-pressure (HP) cylinder of the CO2 compressor.

  1. Retrofitting reciprocating compressors for noise control

    International Nuclear Information System (INIS)

    The Alberta Energy Resources Conservation Board recently enacted their noise control directive ID 88-1. The effects of this regulation on the operation of an oil and gas facility are discussed, and a specific case history is presented to provide a disciplined strategy for noise attenuation retrofits. An investigation was carried out into sound sources at a reciprocating compressor gas plant, revealing several sound sources: engine exhaust stacks, engine exhaust silencer shells, direct-drive fan cooler inlets, direct drive fan cooler outlets, aerial cooler inlets and aerial cooler outlets. Details are presented of the investigative techniques and order-ranking of sources by decibel level. When controlling engine exhaust noise, silencers or mufflers are the preferred treatment. Choice of type (reactive or absorptive) and specification of acoustical performance of a silencer are discussed. The gas plant achieved noise reductions of 6-13 dB, measured at affected residences, through the use of engine exhaust silencers. 4 figs., 2 tabs

  2. Stabilized Liner Compressor: The Return of Linus

    Science.gov (United States)

    Turchi, Peter; Frese, Sherry; Frese, Michael; Mielke, Charles; Hinrichs, Mark; Nguyen, Doan

    2015-11-01

    To access the lower cost regime of magneto-inertial fusion at megagauss magnetic field-levels requires the use of dynamic conductors in the form of imploding cylindrical shells, aka, liners. Such liner implosions can compress magnetic flux and plasma to attain fusion conditions, but are subject to Rayleigh-Taylor instabilities, both in the launch and recovery of the liner material and in the final few diameters of implosion. These instabilities were overcome in the Linus program at the Naval Research Laboratory, c. 1979, providing the experimentally-demonstrated basis for repetitive operation and leading to an economical reactor concept at low fusion gain. The recent ARPA-E program for low-cost fusion technology has revived interest in this approach. We shall discuss progress in modeling and design of a Stabilized Liner Compressor (SLC) that extends the earlier work to higher pressures and liner speeds appropriate to potential plasma targets. Sponsored by ARPA-E ALPHA Program.

  3. 大功率涡旋式氦压缩机系统的研制%Design and study of a scroll helium compressor system

    Institute of Scientific and Technical Information of China (English)

    武义锋; 丁先庚

    2011-01-01

    A scroll helium compressor system with 5.6KW was introduced in this paper, which was used to supply high pressure helium for the cryocooler with big refrigeration capability. Air - condition compressor was remodelled into a helium compressor to ensure cryocooler to work with a long time and high reliability. Results of the experiment and customer's use show that this helium compressor system is reliable and the study is successful. The big power scroll helium compressor system has being produced and sold now.%介绍了一种5.6KW功率涡旋式氦压缩机系统的研制情况,主要是为了配套大冷量低温制冷机而研制的.采用特有的技术对商用空调压缩机进行了改制,并配套了自行设计的高效可靠的滤油纯化系统,满足了制冷机长期可靠工作的要求.经过运行试验和客户使用,该氦压缩机系统性能是可靠的,研制是成功的,并已小批量生产销售.

  4. Gas turbine engine adapted for use in combination with an apparatus for separating a portion of oxygen from compressed air

    Science.gov (United States)

    Bland, Robert J.; Horazak, Dennis A.

    2012-03-06

    A gas turbine engine is provided comprising an outer shell, a compressor assembly, at least one combustor assembly, a turbine assembly and duct structure. The outer shell includes a compressor section, a combustor section, an intermediate section and a turbine section. The intermediate section includes at least one first opening and at least one second opening. The compressor assembly is located in the compressor section to define with the compressor section a compressor apparatus to compress air. The at least one combustor assembly is coupled to the combustor section to define with the combustor section a combustor apparatus. The turbine assembly is located in the turbine section to define with the turbine section a turbine apparatus. The duct structure is coupled to the intermediate section to receive at least a portion of the compressed air from the compressor apparatus through the at least one first opening in the intermediate section, pass the compressed air to an apparatus for separating a portion of oxygen from the compressed air to produced vitiated compressed air and return the vitiated compressed air to the intermediate section via the at least one second opening in the intermediate section.

  5. EFRC guidelines for vibrations in reciprocating compressor systems

    NARCIS (Netherlands)

    Eijk, A.

    2008-01-01

    One of the disadvantages of a reciprocating compressor is that it generates pulsations and vibrations, which, without limitation and proper attention during design, manufacturing, installation and operation, can lead to fatigue failures, inefficiency, capacity limitations and unsafe situations. To j

  6. A computer simulation study of compressor tuning phenomena

    Science.gov (United States)

    Nieter, J. J.; Singh, R.

    1984-12-01

    Basic thermofluid processes of a positive displacement compressor are strongly dependent upon the acoustic behavior of the manifolds. The tuning process of such a compressor is fairly complex as increases in the mass flow rate may not correspond with higher energy efficiencies. In this paper a computer simulation program is described, which includes the manifold back pressure effect, developed to investigate and explain the tuning phenomena for a single or two-cylinder reciprocating compressor. A symmetric suction manifold system for a two-cylinder refrigeration compressor has been considered as the example case in this tuning study. Results for flow efficiency, energy efficiency, and pressure pulsations at the valve exit are presented in terms of the acoustic natural frequencies of the manifold system. Predicted results compare reasonably well with experimental data. Based on this study, it is possible to choose optimal manifold dimensions which will provide higher efficiencies with lower pressure pulsations.

  7. Vapor Compressor Driven Hybrid Two-Phase Loop Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This Small Business Innovation Research Phase I project will demonstrate a vapor compressor driven hybrid two-phase loop technology. The hybrid two-phase loop...

  8. The performance of a linear compressor with triangle flexure bearings

    Science.gov (United States)

    Zhou, Wenjie; Wang, Longyi; Gan, Zhihua; Qiu, L. M.; Pfotenhauer, John

    2012-06-01

    This paper reports the performance of a self-fabricated moving coil linear compressor at Zhejiang University. The efficiency of this compressor is tested by an RC load method. From experimental results, its resonant frequency is below 30Hz. When combined with a pulse tube cryocooler (PTC) working at 40Hz, the minimum temperature is 49.1K; the cooling power at 80K is 4.5W, with 540W electricity power input. From the RC load experiment, the maximum efficiency of this compressor is only 37% at 21 Hz. Therefore, this compressor has the potential to drive a three stage PTC at liquid helium temperature by running at 25Hz or lower.

  9. Axial flow, multi-stage turbine and compressor models

    International Nuclear Information System (INIS)

    Design models of multi-stage, axial-flow turbine and compressor are developed for high temperature nuclear reactor power plants with Closed Brayton Cycle for energy conversion. The models are based on a mean-line through-flow analysis for free-vortex flow, account for the profile, secondary, end wall, trailing edge and tip clearance losses in the cascades, and calculate the geometrical parameters of the blade cascades. The effects of the mean-stage work coefficient, flow coefficient and stage reaction on the design and performance of helium turbine and compressor are investigated. The results compare favorably with those reported for 6 stages helium turbine and 20 stages helium compressor. Also presented and discussed are the results of parametric analyses of a 530-MW helium turbine, and a 251-MW helium compressor.

  10. Optimization of refrigeration system with gas-injected scroll compressor

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Baolong; Shi, Wenxing; Han, Linjun; Li, Xianting [Department of Building Science, Tsinghua University, Beijing 100084 (China)

    2009-11-15

    Gas refrigerant injection has been proven as an effective method to improve the performance of the scroll compressor and its refrigeration system under high compression ratio working conditions. Much research on the injected scroll compressor and its system has been conducted, but the universal control and design method is still lacking. A model of the refrigeration system with a gas-injected scroll compressor is developed in this paper. With this model, the effects of gas injection on the system and component parameters are investigated. Based on the identified evaporator characteristics and thermodynamic analysis, a set of general principles for the design and operation of the refrigeration or heat pump system with a gas-injected scroll compressor is proposed. (author)

  11. A Novel Aerodynamic Design Method for Centrifugal Compressor Impeller

    Directory of Open Access Journals (Sweden)

    Mahdi Nili-Ahmadabadi

    2014-01-01

    Full Text Available This paper describes a new quasi-3D design method for centrifugal compressor impeller. The method links up a novel inverse design algorithm, called Ball-Spine Algorithm (BSA, and a quasi-3D analysis. Euler equation is solved on the impeller meridional plane. The unknown boundaries (hub and shroud of numerical domain are iteratively modified by BSA until a target pressure distribution in flow passage is reached. To validate the quasi-3D analysis code, existing compressor impeller is investigated experimentally. Comparison between the quasi-3D analysis and the experimental results shows good agreement. Also, a full 3D Navier-Stokes code is used to analyze the existing and designed compressor numerically. The results show that the momentum decrease near the shroud wall in the existing compressor is removed by hub-shroud modifications resulting an improvement in performance by 0.6 percent.

  12. A Novel Plasma-Based Compressor Stall Control System Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Modern aircraft gas turbine engines utilize highly loaded airfoils in both the compressor and turbine to maximize performance while minimizing weight, cost, and...

  13. Tailoring Inlet Flow to Enable High Accuracy Compressor Performance Measurements

    Science.gov (United States)

    Brossman, John R.; Smith, Natalie R.; Talalayev, Anton; Key, Nicole L.

    2011-12-01

    To accomplish the research goals of capturing the effects of blade row interactions on compressor performance, small changes in performance must be measurable. This also requires axi-symmetric flow so that measuring one passage accurately captures the phenomena occurring in all passages. Thus, uniform inlet flow is a necessity. The original front-driven compressor had non-uniform temperature at the inlet. Additional challenges in controlling shaft speed to within tight tolerances were associated with the use of a viscous fluid coupling. Thus, a new electric motor, with variable frequency drive speed control was implemented. To address the issues with the inlet flow, the compressor is now driven from the rear resulting in improved inlet flow uniformity. This paper presents the design choices of the new layout in addition to the preliminary performance data of the compressor and an uncertainty analysis.

  14. Development Of A Centrifugal Hydrogen Pipeline Gas Compressor

    Energy Technology Data Exchange (ETDEWEB)

    Di Bella, Francis A. [Concepts NREC, White River Junction, VY (United States)

    2015-04-16

    Concepts NREC (CN) has completed a Department of Energy (DOE) sponsored project to analyze, design, and fabricate a pipeline capacity hydrogen compressor. The pipeline compressor is a critical component in the DOE strategy to provide sufficient quantities of hydrogen to support the expected shift in transportation fuels from liquid and natural gas to hydrogen. The hydrogen would be generated by renewable energy (solar, wind, and perhaps even tidal or ocean), and would be electrolyzed from water. The hydrogen would then be transported to the population centers in the U.S., where fuel-cell vehicles are expected to become popular and necessary to relieve dependency on fossil fuels. The specifications for the required pipeline hydrogen compressor indicates a need for a small package that is efficient, less costly, and more reliable than what is available in the form of a multi-cylinder, reciprocating (positive displacement) compressor for compressing hydrogen in the gas industry.

  15. Cooling Effect Improvement by Dimensional Modification of Annular Fins in Two Stage Reciprocating Compressor

    Directory of Open Access Journals (Sweden)

    Mr. Ashish D. Vasiyar,

    2014-05-01

    Full Text Available The Reciprocating Compressor fins are made from Aluminum alloy and it is provided for increase in contact area in convective heat transfer. Air cooling is a method of dissipating heat It works by making the object to be cooled have a larger surface area or have an increased flow of air over its surface. a fin is a surface that extends from an object to increase the rate of heat transfer to or from the environment by increasing convection. The aim of present work study is to prepare a finite element model of fin. The result of finite element model will be verified with experimental work with thermocouple. After comparing results of FEA model we can modify boundary condition, material shape & size for improvement in efficiency & cooling rate. It is possible to find optimum solution with FEA package ANSYS 14 used for modeling and analysis. Effectiveness of fin can be improved by changing geometry of fin. So after increase effectiveness it can increase cooling rate and minimize the time for cooling process of Reciprocating compressor. Aim of this work is increase effectiveness of the fin for best performance.

  16. Variable speed hermetic reciprocating compressors for domestic refrigerators

    DEFF Research Database (Denmark)

    Rasmussen, Bjarne D.

    1998-01-01

    This article describes the results of a both theoretical and experimental investigation of the performance of variable speed hermetic reciprocating compressors for domestic refrigerators. The investigation was performed as a part of a larger research project with the objective of reducing...... the energy consumption of domestic refrigerators by increasing the efficiency of the refrigeration system. The improvement of the system efficiency was to be obtained by introducing continuous operation and use variable speed compressors for controlling the capacity of the refrigeration system...

  17. Compound fuzzy model for thermal performance of refrigeration compressors

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The fuzzy method is introduced to the calculation of thermal performance of refrigeration compressors. A compound model combining classical thermodynamic theory and fuzzy theory is presented and compared with a simple fuzzy model without classical thermodynamic fundamentals. Case study of refrigeration compressors shows that the compound fuzzy model and the simple fuzzy model are both more efficient than the classical thermodynamic method. However, the compound fuzzy model is of better precision and adaptability.

  18. Hyper dispersion pulse compressor for chirped pulse amplification systems

    Energy Technology Data Exchange (ETDEWEB)

    Barty, Christopher P. J. (Hayward, CA)

    2011-11-29

    A grating pulse compressor configuration is introduced for increasing the optical dispersion for a given footprint and to make practical the application for chirped pulse amplification (CPA) to quasi-narrow bandwidth materials, such as Nd:YAG. The grating configurations often use cascaded pairs of gratings to increase angular dispersion an order of magnitude or more. Increased angular dispersion allows for decreased grating separation and a smaller compressor footprint.

  19. Impact on the magnetic compressor due to CSR

    International Nuclear Information System (INIS)

    When an electron bunch is compressed in a chicane compressor, the CSR (coherent synchrotron radiation) will induce energy redistribution along the bunch. Such energy redistribution will affect the longitudinal emittance as a direct consequence. It will also excite betatron oscillation due to the chromatic transfer functions, and hence a transverse emittance change. So, it is indispensable for us to find a way to alleviate the CSR-caused emittance dilution and the bad result of chicane compressor in PKU-FEL. (authors)

  20. Development and Design of a Centrifugal Compressor Volute

    OpenAIRE

    Cheng Xu; Michael Müller

    2005-01-01

    The volute is one of the key components of a centrifugal compressor. The design of the volute not only impacts the compressor efficiency but also influences the operating range. The detailed flow simulation presented here helps to better understand the volute flow mechanisms and provide design guidance in volute design to meet performance goals. In this study, the viscous Navier-Stokes equations are used to simulate the flow inside the vaneless diffuser and volute. The de...

  1. Pressure Pulsation Signal Analysis for Centrifugal Compressor Blade Crack Determination

    OpenAIRE

    Hongkun Li; Xuefeng Zhang; Xiaowen Zhang; Shuhua Yang; Fujian Xu

    2014-01-01

    Blade is a key piece of component for centrifugal compressor. But blade crack could usually occur as blade suffers from the effect of centrifugal forces, gas pressure, friction force, and so on. It could lead to blade failure and centrifugal compressor closing down. Therefore, it is important for blade crack early warning. It is difficult to determine blade crack as the information is weak. In this research, a pressure pulsation (PP) sensor installed in vicinity to the crack area is used to d...

  2. A Novel Aerodynamic Design Method for Centrifugal Compressor Impeller

    OpenAIRE

    Mahdi Nili-Ahmadabadi; mohammad durali; Ali Hajilouy Benisi

    2014-01-01

    This paper describes a new quasi-3D design method for centrifugal compressor impeller. The method links up a novel inverse design algorithm, called Ball-Spine Algorithm (BSA), and a quasi-3D analysis. Euler equation is solved on the impeller meridional plane. The unknown boundaries (hub and shroud) of numerical domain are iteratively modified by BSA until a target pressure distribution in flow passage is reached. To validate the quasi-3D analysis code, existing compressor impeller is investig...

  3. Comparison of Two Diffusers in a Transonic Centrifugal Compressor

    OpenAIRE

    Koji Nakagawa; Hiroshi Hayami; Yuichi Keimi

    2003-01-01

    Flow mechanisms suppressing the flow separation in two diffusers, a low-solidity cascade diffuser and a vaned diffuser with additional small vanes near the inlet, were compared mainly by numerical simulation. As the superiority of the low-solidity cascade diffuser was expected, a series of experiments was conducted using a transonic centrifugal compressor with a maximum pressure ratio of 7. The performance of the compressor with the vaned diffuser was comparable to that of the low-solidity ca...

  4. Design Method for Channel Diffusers of Centrifugal Compressors

    OpenAIRE

    Mykola Kalinkevych; Andriy Skoryk

    2013-01-01

    The design method for channel diffusers of centrifugal compressors, which is based on the solving of the inverse problem of gas dynamics, is presented in the paper. The concept of the design is to provide high pressure recovery of the diffuser by assuming the preseparation condition of the boundary layer along one of the channel surfaces. The channel diffuser was designed with the use of developed method to replace the vaned diffuser of the centrifugal compressor model stage. The numerical si...

  5. Dynamic simulation of centrifugal compressors in a process environment

    OpenAIRE

    Razak, A. M. Y.

    1984-01-01

    The recent developments in process plant design have made it desirable that a better understanding of transient compressor performance within the process plant be gained. The model outlined in this thesis is capable of representing most types of process plants. Further the number of degress of freedom, plus the dynamic flexibility of a poly- tropic analysis allow any system transient to be simulated, including compressor surge. A computer program has been developed from the ...

  6. ADVANCED COMPRESSOR ENGINE CONTROLS TO ENHANCE OPERATION, RELIABILITY AND INTEGRITY

    Energy Technology Data Exchange (ETDEWEB)

    Gary D. Bourn; Jess W. Gingrich; Jack A. Smith

    2004-03-01

    This document is the final report for the ''Advanced Compressor Engine Controls to Enhance Operation, Reliability, and Integrity'' project. SwRI conducted this project for DOE in conjunction with Cooper Compression, under DOE contract number DE-FC26-03NT41859. This report addresses an investigation of engine controls for integral compressor engines and the development of control strategies that implement closed-loop NOX emissions feedback.

  7. Transient characteristic of reciprocating compressors in household refrigerators

    Energy Technology Data Exchange (ETDEWEB)

    Porkhial, S.; Khastoo, B. [Amirkabir University, Tehran (Iran). Dept. of Mechanical Engineering; Modarres Razavi, M.R. [Ferdowsi University, Mashhad (Iran). Dept. of Mechanical Engineering

    2002-08-01

    Reduction in energy consumption associated with household appliances is a challenging subject. One of the appliances with great contribution in energy consumption is the household refrigerators [1 and 2]. Among the different components of a refrigerator, the compressor has the most effect on system energy consumption. A knowledge of the transient performance of compressors is vital for reduction of energy consumption and improving the overall performance of a refrigerator. In this paper the M7 model of 1/5 hp Nicchi compressor belonging to 12 ft{sup 3} refrigerators with refrigerant R12 is selected as a sample and different tests are carried out to determine its transient behavior. Based on the analysis of experimental results, the governing equations and the simulation program of transient behavior have been developed. Good agreement between theoretical and experimental results means that the simulation model could be an appropriate tool to study the transient behavior of reciprocating compressors in different conditions. Analysis of predicted and experimental results shows that refrigerators consume more power in the transient mode as compared to the steady mode, therefore shortening the transient period can lower the energy consumption of the system. Also an isentropic assumption for the hermetic compressor is not a correct assumption, especially for the transient mode. With appropriate design of compressor inlet which locates it near to the suction valve, the energy efficiency will be improved. (author)

  8. Design and Characterization of a Centrifugal Compressor Surge Test Rig

    Directory of Open Access Journals (Sweden)

    Kin Tien Lim

    2011-01-01

    Full Text Available A detailed description of a new centrifugal compressor surge test rig is presented. The objective of the design and development of the rig is to study the surge phenomenon in centrifugal compression systems and to investigate a novel method of surge control by active magnetic bearing servo actuation of the impeller axial tip clearance. In this paper, we focus on the design, initial setup, and testing of the rig. The latter two include the commissioning of the rig and the experimental characterization of the compressor performance. The behavior of the compressor during surge is analyzed by driving the experimental setup into surge. Two fundamental frequencies, 21 Hz and 7 Hz, connected to the surge oscillation in the test rig are identified, and the observed instability is categorized according to the intensity of pressure fluctuations. Based on the test results, the excited pressure waves are clearly the result of surge and not stall. Also, they exhibit the characteristics of mild and classic surge instead of deep surge. Finally, the change in the compressor performance due to variation in the impeller tip clearance is experimentally examined, and the results support the potential of the tip clearance modulation for the control of compressor surge. This is the first such demonstration of the feasibility of surge control of a compressor using active magnetic bearings.

  9. The new performance calculation method of fouled axial flow compressor.

    Science.gov (United States)

    Yang, Huadong; Xu, Hong

    2014-01-01

    Fouling is the most important performance degradation factor, so it is necessary to accurately predict the effect of fouling on engine performance. In the previous research, it is very difficult to accurately model the fouled axial flow compressor. This paper develops a new performance calculation method of fouled multistage axial flow compressor based on experiment result and operating data. For multistage compressor, the whole compressor is decomposed into two sections. The first section includes the first 50% stages which reflect the fouling level, and the second section includes the last 50% stages which are viewed as the clean stage because of less deposits. In this model, the performance of the first section is obtained by combining scaling law method and linear progression model with traditional stage stacking method; simultaneously ambient conditions and engine configurations are considered. On the other hand, the performance of the second section is calculated by averaged infinitesimal stage method which is based on Reynolds' law of similarity. Finally, the model is successfully applied to predict the 8-stage axial flow compressor and 16-stage LM2500-30 compressor. The change of thermodynamic parameters such as pressure ratio, efficiency with the operating time, and stage number is analyzed in detail. PMID:25197717

  10. Operating experiences and test results of six cold helium compressors

    Science.gov (United States)

    Brown, D. P.; Gibbs, R. J.; Schlafke, A. P.; Sondericker, J. H.; Wu, K. C.

    Three small and three large cold helium centrifugal compressors have been operated at Brookhaven National Laboratory between 1981 and 1986. The three small cold compressors have been installed on a 1000 W refrigerator for testing a string of superconducting magnets and for R and D purposes. The three large units are components of the BNL 24.8 KW refrigerator to be used to provide cooling for the RHIC project. These compressors are used either to circulate a large amount of supercritical helium through a group of magnets or to pump on the helium bath to reduce temperature in the system. One small circulating compressor tested employs tilting-pad gas bearings and is driven by a DC motor. The two small cold vacuum pumps tested use oil bearings and are driven by oil turbines. The three large oil-bearing cold compressors are driven by DC motors through a gear box. A unique feature of the large vacuum pump is the combination of two pumps with a total of four stages on the same shaft. The adiabatic efficiencies are found to be 57% for the large vacuum pumps and close to 50% for the large circulating compressor. Good overall reliability has been experienced.

  11. The New Performance Calculation Method of Fouled Axial Flow Compressor

    Directory of Open Access Journals (Sweden)

    Huadong Yang

    2014-01-01

    Full Text Available Fouling is the most important performance degradation factor, so it is necessary to accurately predict the effect of fouling on engine performance. In the previous research, it is very difficult to accurately model the fouled axial flow compressor. This paper develops a new performance calculation method of fouled multistage axial flow compressor based on experiment result and operating data. For multistage compressor, the whole compressor is decomposed into two sections. The first section includes the first 50% stages which reflect the fouling level, and the second section includes the last 50% stages which are viewed as the clean stage because of less deposits. In this model, the performance of the first section is obtained by combining scaling law method and linear progression model with traditional stage stacking method; simultaneously ambient conditions and engine configurations are considered. On the other hand, the performance of the second section is calculated by averaged infinitesimal stage method which is based on Reynolds’ law of similarity. Finally, the model is successfully applied to predict the 8-stage axial flow compressor and 16-stage LM2500-30 compressor. The change of thermodynamic parameters such as pressure ratio, efficiency with the operating time, and stage number is analyzed in detail.

  12. Development of piston compressors for refrigeration engineering; some remarks on the new 'GRASSO' RC6 piston compressor

    Energy Technology Data Exchange (ETDEWEB)

    Cosijn, E.; Touber, S.; Zwaans, J.H.J.M.

    1988-11-01

    The reciprocating compressor is a machine having a long history of development. Based on experience and classical design methods, a reliable type of machine has arisen, which has found a widespread use, also in refrigeration. Consequently, is there still anything that might be expected from further improvements in design by making gradual changes only, whilst maintaining the same basic principle. The authors' opinion is that to this question a positive answer can be given. Their conclusion is based on the huge acceleration which took place in compressor development, made possible by the application of modern computer techniques. In this connection, they report about some interesting results obtained in designing a new series of reciprocating compressors, the Grasso RC6. This article describes computer applications in valve design, in strength calculation of compressor housings in laboratory testing.

  13. DEVELOPMENT OF NEURO FUZZY CONTROLLER ALGORITHM FOR AIR CONDITIONING SYSTEM

    OpenAIRE

    AMRIT KAUR; ARSHDEEP KAUR

    2012-01-01

    The paper presents the neuro-fuzzy controller algorithm for air conditioning system. Neuro-fuzzy control combines the learning capabilities of neural networks and control capabilities of fuzzy logic control. The neurofuzzy controller for air conditioning system takes two inputs from temperature and humidity sensors and controls the compressor speed. The experimental results of the developed system are also shown.

  14. DEVELOPMENT OF NEURO FUZZY CONTROLLER ALGORITHM FOR AIR CONDITIONING SYSTEM

    Directory of Open Access Journals (Sweden)

    AMRIT KAUR

    2012-04-01

    Full Text Available The paper presents the neuro-fuzzy controller algorithm for air conditioning system. Neuro-fuzzy control combines the learning capabilities of neural networks and control capabilities of fuzzy logic control. The neurofuzzy controller for air conditioning system takes two inputs from temperature and humidity sensors and controls the compressor speed. The experimental results of the developed system are also shown.

  15. Mountain Plains Learning Experience Guide: Heating, Refrigeration, & Air Conditioning.

    Science.gov (United States)

    Carey, John

    This Heating, Refrigeration, and Air Conditioning course is comprised of eleven individualized units: (1) Refrigeration Tools, Materials, and Refrigerant; (2) Basic Heating and Air Conditioning; (3) Sealed System Repairs; (4) Basic Refrigeration Systems; (5) Compression Systems and Compressors; (6) Refrigeration Controls; (7) Electric Circuit…

  16. An open reversed Brayton cycle with regeneration using moist air for deep freeze cooled by circulating water

    Energy Technology Data Exchange (ETDEWEB)

    Hou, Shaobo [Guangdong Ocean University, College of Engineering, East Jiefang Rd. No. 40, Xiashan, Zhanjiang, Guangdong 524006 (China); Northwestern Polytechnical University, School of Aeroengine and Thermal Power Engineering, Xi' an, Shaanxi 710072 (China); Zhang, Hefei [Northwestern Polytechnical University, School of Aeroengine and Thermal Power Engineering, Xi' an, Shaanxi 710072 (China)

    2009-01-15

    This paper presents an open reversed Brayton cycle with regeneration using moist air for deep freeze cooled by circulating water, and proves its feasibility through performance simulation. Pinch technology is used to analyze the cooling of the wet air after compressor and the water used for cooling wet air after compressor. Its refrigeration depends mainly on the sensible heat of air and the latent heat of water vapor, its performance is more efficient than a conventional air-cycle, and the utilization of turbo-machinery makes it possible. The adoption of this cycle will make deep freeze easily and reduce initial cost because very low temperature, about -55 C, air is obtained. The sensitivity analysis of coefficient of performance to the efficiency of compressor and the efficiency of compressor, and the results of the cycle are also given. The simulation results show that the COP of this system depends on the temperature before turbine, the efficiency of compressor and the efficiency of compressor, and varies with the wet bulb temperature of the outdoor air. Humid air is a perfect working fluid for deep freeze with no cost to the user. (author)

  17. Laboratory evaluation of compressor blades considered for use in CIP/CUP compressors

    International Nuclear Information System (INIS)

    Four die-casting alloys, the external-pressure-pin and conventional casting methods, an accelerated aging heat treatment, and an airfoil fillet modification were evaluated for 33F-S1 compressor blades considered for use in axial flow compressors installed during the Cascade Improvement and Uprating Programs at the three gaseous diffusion plants. Based on castability, resonant frequency, resistance to fatigue cracking, and shank breaking load, the ranking of the four alloys from highest to lowest is GAT2, 214X, X224, and D-15. The GAT2 alloy ranked highest in all categories except impact value; the impact values of both X224 and 214X alloys exceeded that of the GAT2 alloy, thus indicating the latter is relatively more brittle. However, in view of its other excellent properties, including fatigue cracking resistance, GAT2 alloy is worthy of consideration for use in blades for CIP/CUP or Add-on Plant compressors, particularly if castability becomes a problem with the presently used 214X alloy. Use of the external-pressure-pin casting method is not recommended because the resulting casting difficulties cannot be justified by the small increases in shank breaking loads. The airfoil fillet modification, which is a change from the conventional circular fillet to an elliptical fillet, resulted in increases (1.5 to 4.0 percent) in the average resonant frequency and in resistance to fatigue cracking (15 to 100 percent). The results of giving the blades an accelerated aging heat treatment, designed to simulate in excess of 10,000 hours of cascade exposure, showed that overaging had no significant effect on average resonant frequency but that overaging improved blade quality by reducing residual casting stress

  18. Effect of a curved duct upstream on performance of small centrifugal compressors for automobile turbochargers

    Science.gov (United States)

    Kikuchi, Shigeta; Yamasaki, Nobuhiko; Yamagata, Akihiro

    2013-02-01

    Since the automobile turbochargers are installed in an engine compartment with limited space, the ducts upstream of the turbocharger compressor may be curved in a complex manner. In the present paper, the effect of a curved duct upstream on performance of small centrifugal compressors for automobile turbochargers is discussed. The computational fluid dynamics (CFD) analysis of a turbocharger compressor validated for the compressor model with the straight pipe applied to the compressor with the curved pipe are executed, and the deterioration of the performance for the curved pipe is confirmed. It is also found that the deterioration of compressor performance is caused by the interaction of the secondary flow and the impeller.

  19. Radiated BPF sound measurement of centrifugal compressor

    International Nuclear Information System (INIS)

    A technique to measure radiated BPF sound from an automotive turbocharger compressor impeller is proposed in this paper. Where there are high-level background noises in the measurement environment, it is difficult to discriminate the target component from the background. Since the effort of measuring BPF sound was taken in a room with such condition in this study, no discrete BPF peak was initially found on the sound spectrum. Taking its directionality into consideration, a microphone covered with a parabolic cone was selected and using this technique, the discrete peak of BPF was clearly observed. Since the level of measured sound was amplified due to the area-integration effect, correction was needed to obtain the real level. To do so, sound measurements with and without a parabolic cone were conducted for the fixed source and their level differences were used as correction factors. Consideration is given to the sound propagation mechanism utilizing measured BPF as well as the result of a simple model experiment. The present method is generally applicable to sound measurements conducted with a high level of background noise

  20. Radiated BPF sound measurement of centrifugal compressor

    Science.gov (United States)

    Ohuchida, S.; Tanaka, K.

    2013-12-01

    A technique to measure radiated BPF sound from an automotive turbocharger compressor impeller is proposed in this paper. Where there are high-level background noises in the measurement environment, it is difficult to discriminate the target component from the background. Since the effort of measuring BPF sound was taken in a room with such condition in this study, no discrete BPF peak was initially found on the sound spectrum. Taking its directionality into consideration, a microphone covered with a parabolic cone was selected and using this technique, the discrete peak of BPF was clearly observed. Since the level of measured sound was amplified due to the area-integration effect, correction was needed to obtain the real level. To do so, sound measurements with and without a parabolic cone were conducted for the fixed source and their level differences were used as correction factors. Consideration is given to the sound propagation mechanism utilizing measured BPF as well as the result of a simple model experiment. The present method is generally applicable to sound measurements conducted with a high level of background noise.

  1. Adiabatic Liquid Piston Compressed Air Energy Storage

    OpenAIRE

    Petersen, Tage; Elmegaard, Brian; Pedersen, Allan Schrøder

    2013-01-01

    This project investigates the potential of a Compressed Air Energy Storage system (CAES system). CAES systems are used to store mechanical energy in the form of compressed air. The systems use electricity to drive the compressor at times of low electricity demand with the purpose of converting the mechanical energy into electricity at times of high electricity demand. Two such systems are currently in operation; one in Germany (Huntorf) and one in the USA (Macintosh, Alabama). In both cases, ...

  2. Pulsating flow performance of a turbocharger compressor for automotive application

    International Nuclear Information System (INIS)

    Highlights: • The behavior of a turbocharger for automotive application was studied. • A broad experimental activity was developed under steady and unsteady flow. • Compressor performance was analyzed under unsteady flow. • Compressor unsteady flow performance deviates from the corresponding steady state. • The surge line position proved to be affected by unsteady flow operation. -- Abstract: Downsizing with turbocharging is the most promising way, especially in terms of cost, to get reduced fuel consumption and CO2 emissions particularly in the case of Spark Ignition engines. In automotive applications the turbocharger turbine usually operates under heavy unsteady flow conditions due to the opening and closing of engine valves. However, in the case of extremely downsized engines with a reduced number of cylinders and a small intake circuit volume also the compressor performance can be affected by the unsteady flow generated by the engine intake valves. To make simulation models able to accurately predict engine performance, a better understanding of compressor and turbine pulsating flow performance can be accomplished through measurements performed on specialized test facilities, using suitable measuring equipment. As regards the turbocharger compressor, the surge line position under pulsating flow conditions is another important aspect to be considered. In the paper the results of a broad experimental investigation performed on a small turbocharger compressor matched to a downsized gasoline engine are presented. Measurements were developed on the test facility operating at the University of Genoa, which allows investigations on automotive turbochargers both under steady and unsteady flow conditions. Tested turbocharger compressor was coupled to the automotive engine intake circuit and the pulsating flow was generated by a motor-driven cylinder head fitted with a variable valve actuation system. Different levels of turbocharger rotational speed and

  3. VSD a compressor that automatically reduces the power consumption; VSD un compresor que reduce automaticamente el consumo energetico

    Energy Technology Data Exchange (ETDEWEB)

    De Anda L, Pedro [Atlas Copco, Mexico, D.F. (Mexico)

    2001-07-01

    With the purpose of verifying the behavior in the demand of air in the different plants Copco Atlas made a sampling of 135 measurements, from which it was concluded, that the air consumption of the plants behaves under three main profiles. In the following graphs the behavior of the demand of air with one color for every day of the week and 24 hours per day. In this sample Profile No. 1 is typical of the industries that work 24 hours a day and have low demand of air at night. This type of profile represents a percentage of 64% of the total of the measurements made. The second profile represents industries that work 5 days per week with two shifts and represents a percentage of 28%. The third profile is typical for applications of fixed consumption during the 5 days of the week, this represents an 8% of the measurements. With the purpose of improving the efficiency in the compressors energy consumption, Atlas Copco has been pioneering in the development of compressors with Variable Speed Drive (VSD), that offers the possibility of adapting with extreme precision the capacity of the compressor to the variable demand of compressed air of the plant. [Spanish] Con la finalidad de verificar el comportamiento en la demanda de aire en las diferentes plantas Atlas Copco realizo un muestreo de 135 mediciones, del cual se concluyo, que el consumo de aire de las plantas se comporta bajo tres perfiles principales. En las siguientes graficas se muestra el comportamiento de la demanda de aire con un color por cada dia de la semana y 24 horas al dia . En esta muestra el Perfil No. 1 es tipico de las Industrias que trabajan las 24 horas del dia y tiene baja demanda de aire en las noches. Este tipo de perfil representa un porcentaje de 64% del total de las mediciones realizadas. El segundo perfil representa industrias que traban 5 dias a la semana con dos turnos y representa un porcentaje de 28%. El tercer perfil estetico para aplicaciones de consumo fijo durante 5 dias a la semana

  4. A high pressure ratio DC compressor for tactical cryocoolers

    Science.gov (United States)

    Chen, Weibo; Cameron, Benjamin H.; Zagarola, Mark V.; Narayanan, Sri R.

    2016-05-01

    A high pressure ratio DC compressor is a critical component for many cryocooler cycles. Prior research has focused on the adaptation of commercial compressor technology (scroll, screw, linear with rectification valves, and regenerative) for use in cryogenic applications where long-life and oil-free (i.e., volatile contamination free) are unique requirements. In addition, many cryocooler applications are for cooling imaging instruments making low vibration an additional requirement. Another candidate compressor technology has emerged from the fuel cell industry. Proton Exchange Membranes (PEMs) are used in fuel cells to separate reactants and transport protons, and these capabilities may be used in cryocoolers to compress hydrogen from low to high pressure. A particular type of PEM utilizing an anhydrous membrane forms the basis of a solid-state cryocooler. Creare has been investigating the use of PEM compressors for low temperature Joule-Thomson and dilution cryocoolers. These cryocoolers have no moving parts, can operate at temperatures down to nominally 23 K, produce no vibration, and are low cost. Our work on the cycle optimization, cryocooler design, and development and demonstration of the compressor technology is the subject of this paper.

  5. Feasible Methodology for Optimization of a Novel Reversible Binary Compressor

    Directory of Open Access Journals (Sweden)

    Neeraj Kumar Misra

    2015-08-01

    Full Text Available Now a day’s reversible logic is an attractive research area due to its low power consumption in the area of VLSI circuit design. The reversible logic gate is utilized to optimize power consumption by a feature of retrieving input logic from an output logic because of bijective mapping between input and output. In this manuscript, we design 4:2 and 5:2 reversible compressor circuits using a new type of reversible gate. In addition, we propose new gate, named as inventive0 gate for optimizing a compressor circuit. The utility of the inventive0 gate is that it can be used as full adder and full subtraction with low value of garbage outputs and quantum cost. An algorithm is shown for designing a compressor structure. The comparative study shows that the proposed compressor structure outperforms the existing ones in terms of garbage outputs, number of gates and quantum cost. The compressor can reduce the effect of carry (Produce from full adder of the arithmetic frame design. In addition, we implement a basic reversible gate of MOS transistor with less number of MOS transistor count

  6. Probabilistic analysis of manufacturing uncertainties for an automotive turbocharger centrifugal compressor using numerical and experimental methods

    NARCIS (Netherlands)

    Javed, A.; Kamphues, E.; Hartuc, T.; Pecnik, R.; Van Buijtenen, J.P.

    2015-01-01

    The compressor impellers for mass-produced turbochargers are generally die-casted and machined to their final configuration. Manufacturing uncertainties are inherently introduced as stochastic dimensional deviations in the impeller geometry. These deviations eventually propagate into the compressor

  7. 40 CFR 86.162-03 - Approval of alternative air conditioning test simulations.

    Science.gov (United States)

    2010-07-01

    ... alternative air conditioning test simulations. (a) Upon petition from a manufacturer or upon the Agency's own initiative, the Administrator will approve a simulation of the environmental cell for air conditioning test... the tailpipe emissions, air conditioning compressor load, and fuel economy. (2) For any...

  8. Compressed Air System Optimization: Case Study Food Industry in Indonesia

    Science.gov (United States)

    Widayati, Endang; Nuzahar, Hasril

    2016-01-01

    Compressors and compressed air systems was one of the most important utilities in industries or factories. Approximately 10% of the cost of electricity in the industry was used to produce compressed air. Therefore the potential for energy savings in the compressors and compressed air systems had a big challenge. This field was conducted especially in Indonesia food industry or factory. Compressed air system optimization was a technique approach to determine the optimal conditions for the operation of compressors and compressed air systems that included evaluation of the energy needs, supply adjustment, eliminating or reconfiguring the use and operation of inefficient, changing and complementing some equipment and improving operating efficiencies. This technique gave the significant impact for energy saving and costs. The potential savings based on this study through measurement and optimization e.g. system that lowers the pressure of 7.5 barg to 6.8 barg would reduce energy consumption and running costs approximately 4.2%, switch off the compressor GA110 and GA75 was obtained annual savings of USD 52,947 ≈ 455 714 kWh, running GA75 light load or unloaded then obtained annual savings of USD 31,841≈ 270,685 kWh, install new compressor 2x132 kW and 1x 132 kW VSD obtained annual savings of USD 108,325≈ 928,500 kWh. Furthermore it was needed to conduct study of technical aspect of energy saving potential (Investment Grade Audit) and performed Cost Benefit Analysis. This study was one of best practice solutions how to save energy and improve energy performance in compressors and compressed air system.

  9. Measurement of Lubricating Condition between Swashplate and Shoe in Swashplate Compressors under Practical Operating Conditions

    Science.gov (United States)

    Suzuki, Hisashi; Fukuta, Mitsuhiro; Yanagisawa, Tadashi

    In this paper, lubricating conditions between a swashplate and a shoe in a swashplate compressor for automotive air conditioners is investigated experimentally. The conditions are measured with an electric resistance method that utilizes the swash plate and the shoe as electrodes respectively. The instrumented compressor is connected to an experimental cycle with R134a and operated under various operating conditions of pressure and rotational speed. An improved measurement technique and applying a solid contact ratio to the measurement results permit to measure the lubricating condition at high rotational speed (more than 8000 rpm) and to predic an occurrence of scuffing between the swashplate and the shoe, and therefore enables a detailed study of lubricating characteristics. It is shown by the measurement that the voltage of the contact signal decreases, which means better lubricating condition, with the decrease of the compression pressure and with the increase of the rotational speed from 1000 rpm through 5000 rpm. The lubricating condition tends to worsen at more than 5000 rpm. Furthermore, it is confirmed that the lubricating condition under transient operation is worse obviously as compared with that under steady-state operation.

  10. Development of an Electrochemical Separator and Compressor

    Energy Technology Data Exchange (ETDEWEB)

    Trent Molter

    2011-04-28

    Global conversion to sustainable energy is likely to result in a hydrogen-based economy that supports U.S. energy security objectives while simultaneously avoiding harmful carbon emissions. A key hurdle to successful implementation of a hydrogen economy is the low-cost generation, storage, and distribution of hydrogen. One of the most difficult requirements of this transformation is achieving economical, high density hydrogen storage in passenger vehicles. Transportation applications may require compression and storage of high purity hydrogen up to 12,000 psi. Hydrogen production choices range from centralized low-pressure generation of relatively impure gas in large quantities from steam-methane reformer plants to distributed generation of hydrogen under moderate pressure using water electrolysis. The Electrochemical Hydrogen Separator + Compressor (EHS+C) technology separates hydrogen from impurities and then compresses it to high pressure without any moving parts. The Phase I effort resulted in the construction and demonstration of a laboratory-scale hardware that can separate and compress hydrogen from reformate streams. The completion of Phase I has demonstrated at the laboratory scale the efficient separation and compression of hydrogen in a cost effective manner. This was achieved by optimizing the design of the Electrochemical Hydrogen Compression (EHC) cell hardware and verified by parametric testing in single cell hardware. A broad range of commercial applications exist for reclamation of hydrogen. One use this technology would be in combination with commercial fuel cells resulting in a source of clean power, heat, and compressed hydrogen. Other applications include the reclamation of hydrogen from power plants and other industrial equipment where it is used for cooling, recovery of process hydrogen from heat treating processes, and semiconductor fabrication lines. Hydrogen can also be recovered from reformate streams and cryogenic boil-offs using this

  11. Experimental Evaluation of a Miniature Rotary Compressor for Application in Electronics Cooling

    OpenAIRE

    Sathe, Abhijit; Groll, Eckhard; Garimella, Suresh

    2008-01-01

    This paper describes performance measurements on a prototype miniature rotary compressor with refrigerant R134a using a compressor load stand based on a hot-gas bypass design. The hermetically sealed rolling piston compressor runs on a 24 V DC power supply. Because of its small size and compact form factor, it can potentially be used in a miniature vapor compression refrigeration system for electronics cooling applications. Compressor tests are conducted for varying suction pressures, pressur...

  12. Speed and surge control for a lower order centrifugal compressor model

    OpenAIRE

    Gravdahl, Jan T; Olav Egeland

    1998-01-01

    A model of a variable speed centrifugal compression system is presented. The model is based on the work of Greitzer (1976), but the compressor characteristic is developed by modelling the losses in the compressor. For surge control, a close coupled valve is employed. This valve is placed immediately downstream of the compressor, and the pressure drop over the valve is used as the control variable. This makes it possible to manipulate the shape of the equivalent compressor, consisting of compr...

  13. Increasing the Stable Operating Range of a Fixed-Geometry Variable-Speed Centrifugal Compressor

    OpenAIRE

    Brasz, Joost J.

    2014-01-01

    Centrifugal compressors used on water-cooled chillers require stable operation over a wide range of flows at greatly varying pressure ratios. These operational requirements are dictated by variations in cooling demand and ambient conditions. Variable-speed centrifugal compressors are known to maintain their peak efficiency at the varying operating conditions much better than fixed-speed compressors. Replacing a fixed-speed centrifugal compressor with a variable speed one can reduce the annual...

  14. Design and Performance Evaluation of a Very Low Flow Coefficient Centrifugal Compressor

    OpenAIRE

    Yongsheng Wang; Feng Lin; Chaoqun Nie; Abraham Engeda

    2013-01-01

    Very low flow coefficient centrifugal compressors are often applied as the last stages of multistage compressors. Due to the lower volume flow rate, the flow channels in the impeller and diffuser are so narrow that friction loss becomes the main factor, which leads to lower efficiency than that of other stages in the same compressors. In addition, most of design methods are generally based on medium flow coefficient centrifugal compressors. Taking on researches on the low flow coefficient cen...

  15. A Chiller Control Algorithm for Multiple Variable-speed Centrifugal Compressors

    OpenAIRE

    Caballero, Piero; Shih, Chiang; Thornton, W. Turner; Brasz, Joost J.

    2014-01-01

    Capacity control of a chiller with multiple variable-speed centrifugal compressors running in parallel between a common evaporator and condenser under reduced load conditions can be achieved by speed variation and/or adjusting the number of compressors in operation. These different capacity control schemes result in modifications of chiller efficiency under part-load conditions. The decision in selecting the number of operational compressors matching the compressor rotational speed to reach a...

  16. Optimal Vaneless Diffuser Design For A High-End Centrifugal Compressor

    OpenAIRE

    Ahmed, Noukhez; Asim, Taimoor; Mishra, Rakesh; Sivagnanasundaram, Subenuka; Eynon, Paul

    2015-01-01

    Turbochargers are widely used in the automotive industry to reduce engine emissions and to increase the power. Centrifugal compressors are an integral part of turbochargers. Centrifugal compressors comprises primarily of inducer, impeller, diffuser and volute. The diffuser has an important role in the isentropic efficiency of the compressor. Over the past few decades, researchers have been trying to increase the total-to-total compressor stage efficiency by altering the diffuser’s geometries....

  17. Effects of Non Ideal Inlet and Outlet Pipes on Measured Compressor Efficiency

    OpenAIRE

    Ekberg, Kristoffer

    2015-01-01

    The thesis is about investigating the inlet and outlet pipes effect on the compressors measured performance. From measurements made in a gas stand, a thermodynamic model is to be created and the compressor efficiency further investigated. The temperatures and pressures entering and leaving the compressor does not have to be the same as the temperatures measured in the gasstand, because of the thermodynamics of the pipes that connects the measurement equipment and the compressor. During a gass...

  18. Performance of the Use of Plastics in Oil-Free Scroll Compressors

    OpenAIRE

    Shaffer, Bryce R.; Eckhard A. Groll

    2012-01-01

    Manufacturing cost of high precision scroll compressor parts remains a dominating factor in determining the overall production cost. Traditionally, scroll compressors are made of metallic parts which require high tolerances to avoid leakage. Precision is even more important when the compressor is designed for oil-free operation and metal to metal contact can potentially be detrimental to the overall performance. With implementation of non-metallic compressor parts such as plastics, various av...

  19. Modeling and investigation of refrigeration system performance with two-phase fluid injection in a scroll compressor

    Science.gov (United States)

    Gu, Rui

    Vapor compression cycles are widely used in heating, refrigerating and air-conditioning. A slight performance improvement in the components of a vapor compression cycle, such as the compressor, can play a significant role in saving energy use. However, the complexity and cost of these improvements can block their application in the market. Modifying the conventional cycle configuration can offer a less complex and less costly alternative approach. Economizing is a common modification for improving the performance of the refrigeration cycle, resulting in decreasing the work required to compress the gas per unit mass. Traditionally, economizing requires multi-stage compressors, the cost of which has restrained the scope for practical implementation. Compressors with injection ports, which can be used to inject economized refrigerant during the compression process, introduce new possibilities for economization with less cost. This work focuses on computationally investigating a refrigeration system performance with two-phase fluid injection, developing a better understanding of the impact of injected refrigerant quality on refrigeration system performance as well as evaluating the potential COP improvement that injection provides based on refrigeration system performance provided by Copeland.

  20. The change of the inlet geometry of a centrifugal compressor stage and its influence on the compressor performance

    Science.gov (United States)

    Wang, Leilei; Yang, Ce; Zhao, Ben; Lao, Dazhong; Ma, Chaochen; Li, Du

    2013-06-01

    The impact on the compressor performance is important for designing the inlet pipe of the centrifugal compressor of a vehicle turbocharger with different inlet pipes. First, an experiment was performed to determine the compressor performance from three cases: a straight inlet pipe, a long bent inlet pipe and a short bent inlet pipe. Next, dynamic sensors were installed in key positions to collect the sign of the unsteady pressure of the centrifugal compressor. Combined with the results of numerical simulations, the total pressure distortion in the pipes, the pressure distributions on the blades and the pressure variability in the diffuser are studied in detail. The results can be summarized as follows: a bent pipe results in an inlet distortion to the compressor, which leads to performance degradation, and the effect is more apparent as the mass flow rate increases. The distortion induced by the bent inlet is not only influenced by the distance between the outlet of the bent section and the leading edge of the impeller but also by the impeller rotation. The flow fields in the centrifugal impeller and the diffuser are influenced by a coupling effect produced by the upstream inlet distortion and the downstream blocking effect from the volute tongue. If the inlet geometry is changed, the distributions and the fluctuation intensities of the static pressure on the main blade surface of the centrifugal impeller and in the diffuser are changed accordingly.

  1. Performance Comparison of Capacity Control Methods for Reciprocating Compressors

    Science.gov (United States)

    Wang, L.; Liu, G. B.; Zhao, Y. Y.; Li, L. L.

    2015-08-01

    Different capacity control methods are used for adjusting suction flow of reciprocating compressors to meet process need. Compared with recycle or bypass and suction throttling, three capacity control methods of speed control, clearance pockets and suction valve unloading are preferred due to their energy-saving at operating condition of partial load. The paper reviewed state of the art of the current capacity control technologies and their principles. A comprehensive mathematical model was developed to predict thermodynamic and dynamic performance of reciprocating compressors equipped with the capacity control systems of four above-mentioned methods. Comparison of shaft work and mechanical efficiency were conducted for different capacity control methods at the same condition. In addition, their influence on p-v diagram and valve motion were also studied, which is important for reliability and life of the reciprocating compressors. These results were helpful for selection of the capacity control systems by end-users and optimum design by manufacturers.

  2. Fault detection in reciprocating compressor valves under varying load conditions

    Science.gov (United States)

    Pichler, Kurt; Lughofer, Edwin; Pichler, Markus; Buchegger, Thomas; Klement, Erich Peter; Huschenbett, Matthias

    2016-03-01

    This paper presents a novel approach for detecting cracked or broken reciprocating compressor valves under varying load conditions. The main idea is that the time frequency representation of vibration measurement data will show typical patterns depending on the fault state. The problem is to detect these patterns reliably. For the detection task, we make a detour via the two dimensional autocorrelation. The autocorrelation emphasizes the patterns and reduces noise effects. This makes it easier to define appropriate features. After feature extraction, classification is done using logistic regression and support vector machines. The method's performance is validated by analyzing real world measurement data. The results will show a very high detection accuracy while keeping the false alarm rates at a very low level for different compressor loads, thus achieving a load-independent method. The proposed approach is, to our best knowledge, the first automated method for reciprocating compressor valve fault detection that can handle varying load conditions.

  3. Prediction of gas pulsation of an industrial compressor

    Institute of Scientific and Technical Information of China (English)

    Heuicheol; Kim; Mi-Gyung; Cho; Jaehong; Park; Cheolho; Bai; Jaesool; Shim

    2013-01-01

    The measurement and prediction of gas pulsations are performed along the discharge pipeline of a reciprocating compressor for a refrigerator. A regression based experimental model of the one-dimensional acoustic field is developed. First, the conventional method for gas pulsation measurement and prediction, which separates the incident and reflected wave of acoustic waves traveling in the frequency domain, is discussed. Then, regression based on our proposed simple model, which is able to predict gas pulsation compared to the conventional method, is introduced for the analysis of a reciprocating compressor(The conventional method requires the value of sound speed in the piping line for the reciprocating compressor). A numerical prediction is made for the regression method. Three power spectrum values along the discharge pipeline are used for analysis, and two values are used for verification. Our results are in a good agreement with the conventional method.

  4. Mode change design for capacity modulation in reciprocating compressor

    Energy Technology Data Exchange (ETDEWEB)

    Bae, Young Ju; Kim, Jin Kook [LG Electronics Inc., Changwon (Korea, Republic of); Kim, Jong Bong [Seoul National University, Seoul (Korea, Republic of); Chang, Young June [Pusan National University, Busan (Korea, Republic of)

    2008-07-15

    Due to environmental issues, the development of low energy consumption products has become one of the main topics in the home appliance industry. The energy consumption of a refrigerator depends on the efficiency of its compressor as well as on the refrigerator cycle design, such as the capacity modulation. This study features the design of a novel capacity modulation reciprocating compressor, i.e., two-step capacity modulation (TCM). In a TCM compressor, capacity modulation is achieved by changing the dead volume in the cylinder. Instead of a concentric sleeve, an eccentric sleeve is used to change the dead volume for the clockwise and counterclockwise rotation of a motor. For stable capacity modulation, a new latching system with a key, a spring, and an eccentric sleeve is introduced, and the mode change reliability is verified by dynamic analysis

  5. A cryogenic axial-centrifugal compressor for superfluid helium refrigeration

    CERN Document Server

    Decker, L; Schustr, P; Vins, M; Brunovsky, I; Lebrun, P; Tavian, L

    1997-01-01

    CERN's new project, the Large Hadron Collider (LHC), will use superfluid helium as coolant for its high-field superconducting magnets and therefore require large capacity refrigeration at 1.8 K. This may only be achieved by subatmospheric compression of gaseous helium at cryogenic temperature. To stimulate development of this technology, CERN has procured from industry prototype Cold Compressor Units (CCU). This unit is based on a cryogenic axial-centrifugal compressor, running on ceramic ball bearings and driven by a variable-frequency electrical motor operating under low-pressure helium at ambient temperature. The machine has been commissioned and is now in operation. After describing basic constructional features of the compressor, we report on measured performance.

  6. JT8D high pressure compressor performance improvement

    Energy Technology Data Exchange (ETDEWEB)

    Gaffin, W.O.

    1981-11-01

    An improved performance high pressure compressor with potential application to all models of the JT8D engine was designed. The concept consisted of a trenched abradable rubstrip which mates with the blade tips for each of the even rotor stages. This feature allows tip clearances to be set so blade tips run at or near the optimum radius relative to the flowpath wall, without the danger of damaging the blades during transients and maneuvers. The improved compressor demonstrated thrust-specific fuel consumption and exhaust gas temperature improvements of 1.0% and at least 10/sup 0/C over the takeoff and climb power range at sea level static conditions, compared to a bill-of-material high pressure compressor. Surge margin also improved 4 percentage points over the high power operating range. A thrust-specific fuel consumption improvement of 0.7% at typical cruise conditions was calculated based on the sea level test results.

  7. JT8D high pressure compressor performance improvement

    Science.gov (United States)

    Gaffin, W. O.

    1981-01-01

    An improved performance high pressure compressor with potential application to all models of the JT8D engine was designed. The concept consisted of a trenched abradable rubstrip which mates with the blade tips for each of the even rotor stages. This feature allows tip clearances to be set so blade tips run at or near the optimum radius relative to the flowpath wall, without the danger of damaging the blades during transients and maneuvers. The improved compressor demonstrated thrust specific fuel consumption and exhaust gas temperature improvements of 1.0 percent and at least 10 C over the takeoff and climb power range at sea level static conditions, compared to a bill-of-material high pressure compressor. Surge margin also improved 4 percentage points over the high power operating range. A thrust specific fuel consumption improvement of 0.7 percent at typical cruise conditions was calculated based on the sea level test results.

  8. Investigation of Surge Behavior in a Micro Centrifugal Compressor

    Institute of Scientific and Technical Information of China (English)

    Shimpei MIZUKI; Yuichiro ASAGA; Yushi ONO; Hoshio TSUJITA

    2006-01-01

    This paper reports the experimental and theoretical study of the surge occurred in prototyping an ultra micro centrifugal compressor. As the first step, the 10 times size model of an ultra micro centrifugal compressor having the 40 mm outer diameter was designed and manufactured. The detailed experimental investigations for the transient behavior of surge with several different values of B parameter were carried out. The experimental results during the surge were compared with those obtained by the non-linear lumped parameter theory in order to validate the effectiveness of the theoretical surge model for the micro centrifugal compressor. As a result, the quite different behavior of the surge appeared for the different values of B both in the experiment and in the analysis.

  9. Unsteady cooperative flow type in the axial compressor

    Institute of Scientific and Technical Information of China (English)

    ZHENG Xinqian; ZHOU Sheng; HOU Anping; XIONG Jinsong

    2005-01-01

    For increasing the performance of the axial compressor, a method for realizing unsteady cooperative flow type is proposed in this paper as a critical objective in the new generation of the axial compressor design system. Unsteady excitations were utilized to trigger the transformation from the unsteady natural flow pattern into the unsteady cooperative flow pattern, resulting in increment of aerodynamic performances of axial compressor. Numerical simulations show that distinct positive effect can be obtained for the 2D cascade in a wide range of subsonic working conditions. No positive effect can be observed under the 2D supersonic working conditions and unsteady excitations have little influence on the flow field space-time structure. However, positive effect can be obtained under the 3D transsonic working conditions. In addition, engineering applications of unsteady cooperative flow type are discussed.

  10. EFRC guidelines on how to avoid liquid problems in reciprocating compressor systems

    NARCIS (Netherlands)

    Shoeibi Omrani, P.; Eijk, A.

    2014-01-01

    Reciprocating compressors are widely used in a variety of industries. Issues with using reciprocating compressors are reliability concerns, especially system failures due to the presence of liquids. The working principle of reciprocating compressors are based on the gas compression of a closed volum

  11. 40 CFR 204.59 - Recall of non-complying compressors.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 24 2010-07-01 2010-07-01 false Recall of non-complying compressors... Recall of non-complying compressors. (a) Pursuant to section 11(d)(1) of the Act, the Administrator may issue an order to the manufacturer to recall and repair or modify any compressor distributed in...

  12. Unsteady behavior and control of vortices in centrifugal compressor

    Science.gov (United States)

    Ohta, Yutaka; Fujisawa, Nobumichi

    2014-10-01

    Two examples of the use of vortex control to reduce noise and enhance the stable operating range of a centrifugal compressor are presented in this paper. In the case of high-flow operation of a centrifugal compressor with a vaned diffuser, a discrete frequency noise induced by interaction between the impeller-discharge flow and the diffuser vane, which appears most notably in the power spectra of the radiated noise, can be reduced using a tapered diffuser vane (TDV) without affecting the performance of the compressor. Twin longitudinal vortices produced by leakage flow passing through the tapered portion of the diffuser vane induce secondary flow in the direction of the blade surface and prevent flow separation from the leading edge of the diffuser. The use of a TDV can effectively reduce both the discrete frequency noise generated by the interaction between the impeller-discharge flow and the diffuser surface and the broadband turbulent noise component. In the case of low-flow operation, a leading-edge vortex (LEV) that forms on the shroud side of the suction surface near the leading edge of the diffuser increases significantly in size and blocks flow in the diffuser passage. The formation of an LEV may adversely affect the performance of the compressor and may cause the diffuser to stall. Using a one-side tapered diffuser vane to suppress the evolution of an LEV, the stable operating range of the compressor can be increased by more than 12 percent, and the pressure-rise characteristics of the compressor can be improved. The results of a supplementary examination of the structure and unsteady behavior of LEVs, conducted by means of detailed numerical simulations, are also presented.

  13. Theory and Simulation of CSR Microbunching in Bunch Compressors

    International Nuclear Information System (INIS)

    CSR microbunching instability in bunch compressors is studied both analytically and numerically. The iterative solutions of the integral equation for the instability provide approximate expressions of CSR microbunching due to initial density and energy modulation, and can be applied to a series of bending systems consisting of multiple compressor chicanes and transport lines. Two similar but independent simulation methods are developed and are compared to each other as well as with theory. We determine the total gain in density modulation for all bend systems of the Linac Coherent Light Source and discuss initial conditions that start the unstable process

  14. Theory and simulation of CSR microbunching in bunch compressors

    International Nuclear Information System (INIS)

    CSR microbunching instability in bunch compressors is studied both analytically and numerically. The iterative solutions of the integral equation for the instability provide approximate expressions of CSR microbunching due to initial density and energy modulation, and can be applied to a series of bending systems consisting of multiple compressor chicanes and transport lines. Two similar but independent simulation methods are developed and are compared to each other as well as with theory. They determine the total gain in density modulation for all bend systems of the Linac Coherent Light Source and discuss initial conditions that start the unstable process

  15. An examination of gas compressor stability and rotating stall

    Science.gov (United States)

    Fozi, Aziz A.

    1987-01-01

    The principal sources of vibration related reliability problems in high pressure centrifugal gas compressors are the re-excitation of the first critical speed or Resonant Subsynchronous Vibration (RSSV), and the forced vibration due to rotating stall in the vaneless diffusers downstream of the impellers. An example of such field problems is given elsewhere. This paper describes the results of a test program at the author's company, initiated in 1983 and completed during 1985, which studied the RSSV threshold and the rotating stall phenomenon in a high pressure gas compressor.

  16. Impact on the magnetic compressor due to CSR

    Institute of Scientific and Technical Information of China (English)

    LIU Chu-Yu; WANG Fang; WANG Er-Dong; QUAN Sheng-Wen; HAO Jian-Kui; LU Xiang-Yang; ZHANG Bao-Cheng; ZHAO Kui

    2008-01-01

    When an electron bunch is compressed in a chicane compressor,the CSR (coherent synchrotron radiation) will induce energy redistribution along the bunch.Such energy redistribution will affect the longitudinal emittance as a direct consequence.It will also excite betatron oscillation due to the chromatic transfer functions,and hence a transverse emittance change.So,it is indispensable for us to find a way to alleviate the CSR-cansed emittance dilution and the bad result of chicane compressor in PKU-FEL.

  17. Numerical and experimental modelling of the radial compressor stage

    Science.gov (United States)

    Syka, Tomáš; Matas, Richard; LuÅáček, Ondřej

    2016-06-01

    This article deals with the description of the numerical and experimental model of the new compressor stage designed for process centrifugal compressors. It's the first member of the new stages family developed to achieve the state of the art thermodynamic parameters. This stage (named RTK01) is designed for high flow coefficient with 3D shaped impeller blades. Some interesting findings were gained during its development. The article is focused mainly on some interesting aspects of the development methodology and numerical simulations improvement, not on the specific stage properties. Conditions and experimental equipment, measured results and their comparison with ANSYS CFX and NUMECA FINE/Turbo CFD simulations are described.

  18. Fatigue Prediction of the Discharge Pipe in Reciprocating Compressor

    OpenAIRE

    Kim, Jung-Hyoun; Kwon, Dae-Il; Lee, Jeong-Bae; Noh, Jong-Soo; Park, Seong-Woo; Lee, Un-Seop

    2014-01-01

    In this paper, a fatigue prediction of the line discharge tube for reciprocating compressor being installed in a refrigerator was studied. The tube usually gets plenty of the repeated loads caused by the start and stop motion of a reciprocating compressor. There are two representative methods to predict the fatigue stress. At first the stress-life can be applied to the problem which takes a lot of repeated stress within the elastic strain range. Second is the strain-life method which can be u...

  19. Reciprocating Compressor Vent Valve Seal Surface Repair%往复式压缩机进排气阀口密封面的修复

    Institute of Scientific and Technical Information of China (English)

    刘军; 朴枫

    2011-01-01

    介绍了往复式压缩机进排气阀口密封面损坏后的不拆卸加工修复方法.可节约修复成本,经济效益十分可观.%Without disassemble process and fix method after reciprocating compressor air intake valve sealing surface are introduced, which can save repair costs and economic benefits are substantial.

  20. Oil-free compressor benefits explained.

    Science.gov (United States)

    Allen, Mark

    2014-09-01

    Oil-free technology for the production of medical air is used in many medical gas systems around the world, and is a requirement of the standards in many places. Under the Department of Health's Health Technical Memorandum, HTM O2-O1, this is not the case, although 'oil-free' is an option. Mark Allen, vice-president of Medical Marketing at Atlas Copco/BeaconMedaes, who is involved with the National Fire Protection Association (NFPA) in the US, the Canadian Standards Association (CSA) in Canada, and the ISO SC-6 (a technical committee on indoor air), discusses how harnessing such technology impacts on production of medical air under the pharmacopeia, and the potential opportunities to reduce maintenance and system problems. PMID:25282984

  1. Compressor Performance Comparison When Using R134 and R1234YF as Working Fluids

    OpenAIRE

    Ooi, Kim Tiow

    2012-01-01

    This paper examines the detailed effects on the compressor performance when using R1234yf as comparedto R134a. Firstly, the effects on the compressor performance of the existing compressors which was designed for R134a when using the new refrigerant R1234yf will be presented and discussed. Secondly, the design aspects of a new compressor to be designed for R1234yf will also be presented and discussed. In the paper the rolling piston compressor was used to carry out the simulation tests. The d...

  2. 离心式空压机防喘振优化%Anti-surge optimization of centrifugal compressor

    Institute of Scientific and Technical Information of China (English)

    李亚伦; 李伟; 孙建平

    2012-01-01

    The optimization of surge prevention and control strategies of centrifugal air compressor in power plant is studied, Surge is an inherent phenomenon of centrifugal air compressor, and to prevent the surge needs to find out the surge curvet for the air flow and outlet pressure, which are used to design the change limit flow control. Fuzzy PID control is used for different pressure deviation range to find suitable controller parameters, making the unit adaptable to the load change.%针对火电厂离心式空压机的喘振预防及控制策略的优化进行分析;喘振是离心式空压机的固有现象,预防喘振需要找到空压机的空气流量和出口压力的喘振曲线,根据喘振曲线设计变极限流量控制方案;控制策略采用模糊PID控制,针对不同的压力偏差区间找到合适的控制器参数,实现了空压机组适应负荷变化的快速性和稳定性.

  3. Aircraft Recirculation Filter for Air-Quality and Incident Assessment

    OpenAIRE

    Eckels, Steven J.; Jones, Byron; Mann, Garrett; Mohan, Krishnan R.; Weisel, Clifford P.

    2014-01-01

    The current research examines the possibility of using recirculation filters from aircraft to document the nature of air-quality incidents on aircraft. These filters are highly effective at collecting solid and liquid particulates. Identification of engine oil contaminants arriving through the bleed air system on the filter was chosen as the initial focus. A two-step study was undertaken. First, a compressor/bleed air simulator was developed to simulate an engine oil leak, and samples were an...

  4. Refrigerant and Lubricant Mass Distribution in a Convertible Split System Residential Air-Conditioner

    OpenAIRE

    Wujek, Scott S.; Bowers, Chad D.; Powell, Joshua W.; Urrego, Roberto A.; Hessell, Edward T.; Benanti, Travis L.

    2014-01-01

    Lubricants are utilized in air-conditioning systems for the purpose of decreasing friction and wear within the compressor. While ideally the lubricant remains in the compressor, some lubricant is entrained and transported by the refrigerant to the other system components. During operational transients, the lubricant is redistributed throughout the various system components. The equilibrium distribution of lubricant depends among other things on fluid properties, phase change processes, flow r...

  5. 78 FR 1162 - Cardiovascular Devices; Reclassification of External Cardiac Compressor

    Science.gov (United States)

    2013-01-08

    ... special controls. Automated external cardiac compressors are tools used by emergency medical personnel to... medical personnel may otherwise prevent adequate chest compressions, can be regulated as class II devices... limitations. The AHA guidelines are intended to support emergency medical personnel with a series...

  6. TFE coating extends life of flexible metal compressor diaphragm

    Science.gov (United States)

    Gorland, S.

    1970-01-01

    Tetrafluoroethylene /TFE/ aerosol sprayed onto entire surface of diaphragm acts as film lubricant and permits diaphragm to slide between upper and lower plates in a reciprocating compressor. Flexing occurs over an area rather than about a single line of action and operating life of diaphragm is more than quadrupled.

  7. On the compressor ring for the JAERI neutron science project

    Energy Technology Data Exchange (ETDEWEB)

    Yamane, Isao [National Lab. for High Energy Physics, Tsukuba, Ibaraki (Japan)

    1997-11-01

    (1), As long as a 1.5 GeV-8 MW linear accelerator is constructed in the JAERI neutron science center, it is quite reasonable to construct a 5 MW compressor ring as a driver of a high intensity spallation neutron source to generate pulsed neutron beams. (2), Suppression of beam loss around the compressor ring to an acceptable level is the most crucial subject to be coped with in designing a MW-class compressor ring. This subject should be successfully cleared by carefully studying and designing the overall system of accelerator and tunnel. (3), The `PSR instability` was comprehensively discussed in the NSNS workshop held at Santa Fe in March, 1997, as a remaining problem of a high intensity proton compressor ring. People of Los Alamos attributed it to an e-p instability. But some questions like the cause that makes some part of protons leak away from a beam bunch to a bunch gap are yet left open. (4), A new scheme of two step H{sup 0} injection is proposed to remove defects of the conventional one of Los Alamos PSR. (author)

  8. Design and test of a high pressure centrifugal compressor

    Energy Technology Data Exchange (ETDEWEB)

    Choi, Jae Ho; Han, Chak Heui; Paeng, Ki Seok; Chen, Seung Bae [Samsung Techwin, Changwon (Korea, Republic of); Kim, Yong Ryun [Agency for Defense Development, Daejeon (Korea, Republic of)

    2005-07-01

    This paper presents an aerodynamic design, flow analysis and performance test of a pressure ratio 4:1 centrifugal compressor for gas turbine engine. The compressor is made up of a centrifugal impeller, a two-stage diffuser consisted of radial and axial types. The impeller has a 45 degree backswept angle and the design running tip clearance is 5% of impeller exit height. Three-dimensional numerical analysis is performed to analyze the flows in the impeller, diffuser and deswirler considering the impeller tip clearance. Test module and rig facilities for the compressor stage performance test are designed and fabricated. The overall compressor stage performances as well as the static pressure fields on the impeller and diffuser are measured. Two diffusers of wedge and airfoil types are tested with an impeller. The calculation and test results show that flow fields downstream the deswirler at the design and off-design points are highly nonuniform and the airfoil diffuser has the better aerodynamic characteristics than those of wedge diffuser.

  9. Optimisation of acoustic silencer for the screw compressor system

    NARCIS (Netherlands)

    Swamy, M.; Lier, L.J. van; Smeulers, J.P.M.

    2014-01-01

    In one of the screw compressor system, designed silencer was not optimal. A great challenge was the large variation in operating conditions, especially the variation of the molecular weight of the gas. There was need to optimize the silencer. This paper describes the acoustic modelling tools to opti

  10. Development of Compressor for Ultra Micro Gas Turbine

    Institute of Scientific and Technical Information of China (English)

    Shimpei MIZUKI

    2007-01-01

    The major problems for the development of an ultra micro gas turbine system were discussed briefly from the stand point of the internal flow and the performance characteristics. Following to these, the development of ultra micro centrifugal compression systems for the ultra micro gas turbine is explained with the design and the manufacturing processes. The measured results of ultra micro centrifugal compressors are shown.

  11. Increased turbo compressor reliability by analysis of fluid structure

    NARCIS (Netherlands)

    Smeulers, J.P.M.; González Diez, N.

    2012-01-01

    The integrity of compressors and pumps is of paramount importance for the gas and oil industry. Failures may result in serious production losses that are in no proportion with the cost of the equipment involved. Besides, the equipment may be inaccessible for maintenance for a long period of time due

  12. New generation of universal modeling for centrifugal compressors calculation

    Science.gov (United States)

    Galerkin, Y.; Drozdov, A.

    2015-08-01

    The Universal Modeling method is in constant use from mid - 1990th. Below is presented the newest 6th version of the Method. The flow path configuration of 3D impellers is presented in details. It is possible to optimize meridian configuration including hub/shroud curvatures, axial length, leading edge position, etc. The new model of vaned diffuser includes flow non-uniformity coefficient based on CFD calculations. The loss model was built from the results of 37 experiments with compressors stages of different flow rates and loading factors. One common set of empirical coefficients in the loss model guarantees the efficiency definition within an accuracy of 0.86% at the design point and 1.22% along the performance curve. The model verification was made. Four multistage compressors performances with vane and vaneless diffusers were calculated. As the model verification was made, four multistage compressors performances with vane and vaneless diffusers were calculated. Two of these compressors have quite unusual flow paths. The modeling results were quite satisfactory in spite of these peculiarities. One sample of the verification calculations is presented in the text. This 6th version of the developed computer program is being already applied successfully in the design practice.

  13. Numerical Study of Unsteady Flow in Centrifugal Cold Compressor

    Science.gov (United States)

    Zhang, Ning; Zhang, Peng; Wu, Jihao; Li, Qing

    In helium refrigeration system, high-speed centrifugal cold compressor is utilized to pumped gaseous helium from saturated liquid helium tank at low temperature and low pressure for producing superfluid helium or sub-cooled helium. Stall and surge are common unsteady flow phenomena in centrifugal cold compressors which severely limit operation range and impact efficiency reliability. In order to obtain the installed range of cold compressor, unsteady flow in the case of low mass flow or high pressure ratio is investigated by the CFD. From the results of the numerical analysis, it can be deduced that the pressure ratio increases with the decrease in reduced mass flow. With the decrease of the reduced mass flow, backflow and vortex are intensified near the shroud of impeller. The unsteady flow will not only increase the flow loss, but also damage the compressor. It provided a numerical foundation of analyzing the effect of unsteady flow field and reducing the flow loss, and it is helpful for the further study and able to instruct the designing.

  14. Satellite refrigerator compressors with the oil and moisture removal systems

    International Nuclear Information System (INIS)

    There are twenty-eight compressors installed around the Main Accelerator Ring in seven locations. Drawing 9140-ME-129720 shows the piping and the components schematic for four Mycom compressor skids per building with each having an independent oil and moisture removal system. The Mycom skids each consist of an oil injected screw compressor of 750 SCFM capacity with a 350 hp motor, oil pump, oil cooler, and oil separator. Helium gas returning from the heat exchanger train is compressed from 1 atm to 20 atm in the compressor. The compressed gas is then passed through the three coalescer de-mister where oil mist is separated from the helium gas. The helium gas then flows through the charcoal adsorber and molecular sieve where any residual oil vapor and water vapor are removed. The final stage of purification is the final filter which removes any remaining particulates from the compressed helium gas. The end product of this system is compressed and purified helium gas ready to be cooled down to cryogenic temperatures

  15. Numerical Simulation of Flow Instabilities in High Speed Multistage Compressors

    Institute of Scientific and Technical Information of China (English)

    JunHu; ThomasPeters; 等

    1999-01-01

    In the present paper,a nonlinear multi“actuator disk” model is proposed to analyze the dynamic behavior of flow instabilities,including rotating stall and surge,in high speed multistage axial compressors.The model describes the duct flow fields using two dimensional,compressible and unsteady Euler equations,and accounts for the influences of downstream plenum and throttle in the system as well.It replaces each blade row of multistage compressore with a disk.For numerical calculations,the time marching procedure,using MacCormack two steps scheme,is used.The main pupose of this paper is to predict the mechanism of two dimensional short wavelength rotating stall inception and the interation between blade rows in high speed multistage compressors.It has been demonstrated that the model has the ability to predict those phenomena,and the results show that some system parameters have a strong effect on the stall features as well.Results for a five stage high speed compressor are analyzed in detail,and comparison with the experimental data demonstrates that the model and calculating results are reliable.

  16. Data compressor designed to improve recognition of magnetic phases

    Science.gov (United States)

    Vogel, E. E.; Saravia, G.; Cortez, L. V.

    2012-02-01

    Data compressors available in the web have been used to determine magnetic phases for two-dimensional (2D) systems [E. Vogel, G. Saravia, F. Bachmann, B. Fierro, J. Fischer, Phase transitions in Edwards-Anderson model by means of information theory, Physica A 388 2009 4075-4082]. In the present work, we push this line forward along four different directions. First, the compressor itself: we design a new data compressor, named wlzip, optimized for the recognition of information having physical (or scientific) information instead of the random digital information usually compressed. Second, for the first time we extend the data compression analysis to the 3D Ising ferromagnetic model using wlzip. Third, we discuss the tuning possibilities of wlzip in terms of the number of digits considered in the compression to yield maximum definition; in this way, the transition temperature of both 2D and 3D Ising ferromagnets can be reported with very good resolution. Fourth, the extension of the time window through which the data file is actually compressed is also considered to get optimum accuracy. The paper is focused on the new compressor, its algorithm in general and the way to apply it. Advantages and disadvantages of wlzip are discussed. Toward the end, we mention other possible applications of this technique to recognize stable and unstable regimes in the evolution of variables in meteorology (such as pollution content or atmospheric pressure), biology (blood pressure) and econophysics (prices of the stock market).

  17. Traveling mirror compressor delay line with nonconstant capacitance

    OpenAIRE

    Bellan, P. M.

    1981-01-01

    The scaling relations for a traveling mirror magnetic compressor [P.M. Bellan, Phys. Rev. Lett. 43, 858 (1979)] having nonconstant capacitance are derived. Varying capacitance (rather than inductance) makes possible a lower impedance device, and hence, higher field levels or faster compression times.

  18. An experimental method for validating compressor valve vibration theory

    NARCIS (Netherlands)

    Habing, R.A.; Peters, M.C.A.M.

    2006-01-01

    This paper presents an experimental method for validating traditional compressor valve theory for unsteady flow conditions. Traditional valve theory considers the flow force acting on the plate and the flow rate as quasi-steady variables. These variables are related via semi-empirical coefficients w

  19. Theoretical and experimental investigations on the match between pulse tube cold fingers and linear compressors

    Science.gov (United States)

    Tan, Jun; Dang, Haizheng; Zhang, Lei

    2015-12-01

    The match between the cold finger and the linear compressor of the Stirling-type pulse tube cryocooler plays a vital role in optimizing the compressor efficiency and in improving the cold finger cooling performance. To reveal the match mechanism between the linear compressor and pulse tube cold finger (PTCF), detailed analyses have been made to understand the interactions between them. Based on the theoretical investigations, both of the design method of the PTCF to match the given linear compressor and a reverse method of the linear compressor to match the given PTCF have been proposed. In order to verify the validity of these theories and methods, actual PTCF and linear compressor are developed to match the existing linear compressor and PTCF, respectively. The experimental results show good agreements with the simulated ones.

  20. Technological advances of compressors in refrigerating machines. Evolutions technologiques des compresseurs de machines frigorifiques

    Energy Technology Data Exchange (ETDEWEB)

    Sartre, V.; Lallemand, M. (Centre National de la Recherche Scientifique, 69 - Villleurbanne (France)); Chiaffi, M. (Societe Bertin et Compagnie, 78 - Plaisir (France))

    1994-03-01

    The present study is related to the development of compressors for heat pumps and refrigerating machines. For a given application, various compressor technologies are possible. The choice is often dictated by the experience acquired on a compressor type, ensuring good reliability and a reasonable cost of the plant. In our study, we examine the limits of various compressor types: piston, screw, scroll, rotary vane, rolling piston and centrifugal. A comparison of the theoretical and practical limits of the compressors' operating ranges shows the necessity of better adaptation of the compressor type to each application. Finally, we suggest the main research focus for the development of future compressors. The new technologies should evolve towards a variable-speed operation, without lubricating oil or with refrigerant lubrication. Acoustic comfort is also an important criterion. (author)

  1. Air Consumption Analysis of Air-Jet Weaving

    Directory of Open Access Journals (Sweden)

    RAJ KUMAR KHIANI

    2016-07-01

    Full Text Available In Textile industry, production is mostly key concern for Industry owner. This always has attracted researchers and machines manufacturers to make new developments in process and machines. Air-jet is one of the leading and successful highest productive weaving machines. However, it is now well established that due to add of charges of compressed air, manufacturing cost of air-jet weaving machine is higher as compared with rapier and projectile weaving machines. This is why countries having energy issues do not prefer air-jet weaving machines comparing projectile weaving machines. In this regard, several researchers and machine manufacturers have continuously been working to improve the efficiency of air-jet weft insertion. However, industry practice is as important as design made by researchers. The aim of this research is to investigate the air consumption of air-jet weaving on industrial scale practice. In this study, five weaving machine of same manufacturer and model were selected. It was observed that despite of manufacturing same quality of fabric, air consumption was varying almost in all weaving machines. Conventionally, mill workers adopt hit and trial practice in weaving industry including airpressure setting which leads to variation of nozzle pressure. Main reason of disparity of air consumption in air-jet weaving machines may be variation of distance from compressor to weaving machines, number of joints, un-necessary valve opening and pipes leakages cause an increase of compressed air consumption.

  2. AUTOMOTIVE DIESEL MAINTENANCE 1. UNIT XIV, I--MAINTAINING THE AIR SYSTEM, CUMMINS DIESEL ENGINE, II--UNIT REMOVAL--TRANSMISSION.

    Science.gov (United States)

    Human Engineering Inst., Cleveland, OH.

    THIS MODULE OF A 30-MODULE COURSE IS DESIGNED TO DEVELOP AN UNDERSTANDING OF THE OPERATING PRINCIPLES AND MAINTENANCE OF THE DIESEL ENGINE AIR SYSTEM AND THE PROCEDURES FOR TRANSMISSION REMOVAL. TOPICS ARE (1) DEFINITION OF TERMS RELATED TO THE DIESEL AIR SYSTEM, (2) PRNCIPLES OF DIESEL AIR COMPRESSORS, (3) PRINCIPLES OF AIR STARTING MOTORS, (4)…

  3. SUMMARY OF ELECTRIC SERVICE COSTS FOR TOTALLY AIR CONDITIONED SCHOOLS PREPARED FOR HOUSTON INDEPENDENT SCHOOL DISTRICT, MAY 31, 1967.

    Science.gov (United States)

    WHITESIDES, M.M.

    THIS REPORT IS A COMPILATION OF DATA ON ELECTRIC AIR CONDITIONING COSTS, OPERATIONS AND MAINTENANCE. AIR CONDITIONING UNITS ARE COMPARED IN TERMS OF ELECTRIC VERSUS NON-ELECTRIC, AUTOMATIC VERSUS OPERATED, AIR COOLED VERSUS WATER COOLED, RECIPROCATING VERSUS CENTRIFUGAL COMPRESSORS, SPACE AND NOISE, REHEAT, MAINTENANCE AND ORIGINAL COST. DATA ARE…

  4. Energy efficient air to air heat pump operating with R-1234yf

    OpenAIRE

    Mortada, Sorina; Clodic, Denis; Arzano-Daurelle, Christine

    2011-01-01

    Significant improvements in energy performance of air-to-air heat pumps are the major reason of their introduction in the late '90s for heating buildings in Japan and several European countries. They are installed in multi-dwelling units and in individual houses. Some of them are using variable speed compressors. European existing air-to-air heat pumps are not adapted for the low-energy building requirements. Their heating capacity is relatively higher than the heating demand and their energy...

  5. Numerical study of a high-speed miniature centrifugal compressor

    Science.gov (United States)

    Li, Xiaoyi

    A miniature centrifugal compressor is a key component of reverse Brayton cycle cryogenic cooling system. The system is commonly used to generate a low cryogenic temperature environment for electronics to increase their efficiency, or generate, store and transport cryogenic liquids, such as liquid hydrogen and oxygen, where space limit is also an issue. Because of space limitation, the compressor is composed of a radial IGV, a radial impeller and an axial-direction diffuser (which reduces the radial size because of smaller diameter). As a result of reduction in size, rotating speed of the impeller is as high as 313,000 rpm, and Helium is used as the working fluid, in order to obtain the required static pressure ratio/rise. Two main characteristics of the compressor---miniature and high-speed, make it distinct from conventional compressors. Higher compressor efficiency is required to obtain a higher COP (coefficient of performance) system. Even though miniature centrifugal compressors start to draw researchers' attention in recent years, understanding of the performance and loss mechanism is still lacking. Since current experimental techniques are not advanced enough to capture details of flow at miniature scale, numerical methods dominate miniature turbomachinery study. This work numerically studied a high speed miniature centrifugal compressor with commercial CFD code. The overall performance of the compressor was predicted with consideration of interaction between blade rows by using sliding mesh model. The law of similarity of turbomachinery was validated for small scale machines. It was found that the specific ratio effect needs to be considered when similarity law is applied. But Reynolds number effect can be neglected. The loss mechanism of each component was analyzed. Loss due to turning bend was significant in each component. Tip leakage loss of small scale turbomachines has more impact on the impeller performance than that of large scale ones. Because the

  6. IEMDC IN-LINE ELECTRIC MOTOR DRIVEN COMPRESSOR

    Energy Technology Data Exchange (ETDEWEB)

    Michael J. Crowley; Prem N. Bansal

    2004-10-01

    This report contains the final project summary and deliverables required by the award for the development of an In-line Electric Motor Driven Compressor (IEMDC). Extensive work was undertaken during the course of the project to develop the motor and the compressor section of the IEMDC unit. Multiple design iterations were performed to design an electric motor for operation in a natural gas environment and to successfully integrate the motor with a compressor. During the project execution, many challenges were successfully overcome in order to achieve the project goals and to maintain the system design integrity. Some of the challenges included limiting the magnitude of the compressor aerodynamic loading for appropriate sizing of the magnetic bearings, achieving a compact motor rotor size to meet the rotor dynamic requirements of API standards, devising a motor cooling scheme using high pressure natural gas, minimizing the impact of cooling on system efficiency, and balancing the system thrust loads for the magnetic thrust bearing. Design methods that were used on the project included validated state-of-the-art techniques such as finite element analysis and computational fluid dynamics along with the combined expertise of both Curtiss-Wright Electro-Mechanical Corporation and Dresser-Rand Company. One of the most significant areas of work undertaken on the project was the development of the unit configuration for the system. Determining the configuration of the unit was a significant step in achieving integration of the electric motor into a totally enclosed compression system. Product review of the IEMDC unit configuration was performed during the course of the development process; this led to an alternate design configuration. The alternate configuration is a modular design with the electric motor and compressor section each being primarily contained in its own pressure containing case. This new concept resolved the previous conflict between the aerodynamic flow

  7. The Role of Tip Leakage Flow in Triggering Rotating Stall of a Low Speed Compressor under Inlet Distortion

    Institute of Scientific and Technical Information of China (English)

    Jingxuan Zhang; Feng Lin; Jingyi Chen; Chaoqun Nie

    2009-01-01

    The stall behavior in a single-stage low-speed axial compressor under rotating inlet distortion (RID) is investi-gated in the first half of this paper. The tests demonstrate that the tip leakage flow (TLF) plays an important rolein triggering rotating stall. The tracking of the spike-like disturbances caused by the spillage of TLV indicates that most of such spike-like disturbances will be smeared by non-distorted sector and the growth of the spike-like dis-turbances actually relate closely to how and how often the path of the propagating disturbances come across the path of the rotating distorted sector. In the second half of this paper, micro air injections are applied to test the ef-fect behavior of TLF on stall inception. Contrasts to without micro air injections, the spike-like disturbances are much fewer, so the possibilities that spike-like disturbances may trigger rotating stall are fewer too. As a result, the compressor gets a lower mass flow rate at stall for both co-rotating inlet distortion and counter-rotating inlet distortion.

  8. Comparative assessment of characteristic part-load performances of screw compressors and turbo-compressors; Vergleich der charakteristischen Teillastwirkungsgrade von Schrauben- und Turboverdichtern

    Energy Technology Data Exchange (ETDEWEB)

    Brasz, J.J.; Hartmann, K. [Carrier Corp., Syracuse, NY (United States)]|[Carrier Corp., Muenchen (Germany)

    2006-07-01

    The relative part-load performance of screw compressors and radial compressors is compared. Compressor part load is represented by a 2D characteristic field with the pressure on the vertical axis as a function of mass flow on the horizontal axis, with efficiencies given for any possible combination of pressure and mass flow. While this manner of representation is common for radial compressors, it is new for screw compressors. In the comparison of compression efficiencies, the focus is on vapour compression. For a valid comparative assessment of total compression, also the mechanical and/or electric loss through bearings, transmission, drive and (in case of variable-speed drives) frequency converters must be taken into account. (orig.)

  9. Detecting thrust bearing failure within a screw compressor

    International Nuclear Information System (INIS)

    A 3 1/2 mile ring of over 1000 superconducting magnets are needed to focus and drive the world's highest energy particle smasher. 24 Refrigerators supply liquid helium to the magnets; 34 high pressure oil flooded screw compressors supply 285 psig helium gas to the refrigerators. The 400 h.p. screws are reliable machines that use 45 gallons of oil per minute to seal and lubricate the rotors, lubricate the bearings, and remove the heat of compression. These machines are spaced out in seven buildings over four miles. A minimum of 28 machines must be operating at all times. A contingent of operators start, stop, and monitor any machine from a distant control room. The 34 compressors have an average of 32,000 hours; 9 machines have over 40,000 hours; the highest is 55,000 hours

  10. SKIP A Pulse Compressor for SuperKEKB

    CERN Document Server

    Sugimura, T; Kakihara, K; Kamitani, T; Ohsawa, S; Yokoyama, K

    2004-01-01

    An upgrade of KEKB injector linac is planned. A main purpose of this upgrade is to increase injection energy of positrons from 3.5 GeV to 8.0 GeV for the SuperKEKB project. By a limitation of land area, our choice is to double an acceleration field utilizing a C-band accelerator structures instead of present S-band structures. Last year we developed C-band components such as accelerator structure, dummy load, 3 dB hybrid coupler, RF window, sub booster, modulator system, and so on. These components were assembled at a test stand and processed. This accelerator unit was installed in the beam line of injector linac and has been under operation. This summer we will install an RF pulse compressor system to the C-band accelerator unit. This paper reports the status of development of the RF pulse compressor system.

  11. Dynamic simulation of reciprocating refrigeration compressors and experimental validation

    Energy Technology Data Exchange (ETDEWEB)

    Castaing-Lasvignottes, Jean; Gibout, Stephane [Laboratoire de Thermique, Energetique et Procedes, Avenue de l' Universite BP1155, 64013 Pau (France)

    2010-03-15

    Among the various ways to simulate compressor behaviour, using efficiency definitions such as volumetric, isentropic or effective is relatively easy to perform and rapid when dynamic simulation is required. Calculating these efficiencies and their dependence on operating pressure, refrigerant type, and temperature is on the contrary relatively difficult to estimate. The approach presented here supposes that they depend essentially on two parameters, the dead volume ratio, having a particular influence on volumetric efficiency, and a friction factor mainly influencing both isentropic and effective efficiencies. The bases of the model are tested for a reversible and for a non-reversible reciprocating compressor when simulated over a compression cycle and dead volume ratio and friction factor influence is studied and discussed. Finally, the model is compared to experiments and allows validating the method, giving quite accurate results. (author)

  12. Quasi-Optical 34-GHz Rf Pulse Compressor

    Energy Technology Data Exchange (ETDEWEB)

    Hirshfield, Jay L

    2007-06-19

    Designs have been carried out on non-high-vacuum, low-power versions of three- and four-mirror quasi-optical passive and active Ka-band pulse compressors, and prototypes built and tested based on these designs. The active element is a quasi-optical grating employing gas discharge tubes in the gratings. Power gains of about 3:1 were observed experimentally for the passive designs, and about 7:1 with the active designs. High-power, high-vacuum versions of the three-and four-mirror quasi-optical pulse compressors were built and tested at low power. These now await installation and testing using multi-MW power from the 34-GHz magnicon.

  13. Performance studies on an axial flow compressor stage

    Science.gov (United States)

    Sitaram, N.

    1986-12-01

    A low-speed, medium loaded axial flow compressor stage is studied experimentally and theoretically. The flow compressor facility, composed of an inlet guide vane row, a rotor blade row, and a stator blade row, and the principles of the streamline curvature method (SCM) and the Douglas-Neumann cascade program are described. The radial distribution of the flow properties, the rotor blade static pressure distribution, and the lift coefficient and relative flow angle derived experimentally and theoretically are compared. It is determined that there is good correlation between the experimental flow properties and the SCM data, the Douglas-Neumann cascade program and experimental rotor blade static pressure data, and the experimental and theoretical lift coefficients only in the midspan region. Modifications to the SCM and the Douglas-Neumann cascade program in order to improve their accuracy are discussed.

  14. Structural and torsional vibration analysis of a dry screw compressor

    Science.gov (United States)

    Willie, J.; Sachs, R.

    2015-08-01

    This paper investigates torsional vibration and pulsating noise in a dry screw compressor. The compressor is designed at Gardner Denver (GD) and is oil free and use for mounting on highway trucks. They are driven using a Power Take-Off (PTO) transmission and gear box on a truck. Torque peak fluctuation and noise measurements are done and their sources are investigated and reported in this work. To accurately predict the torsional response (frequency and relative angular deflection and torque amplitude), the Holzer method is used. It is shown that the first torsional frequency is manifested as sidebands in the gear train meshing frequencies and this can lead to noise that is the result of amplitude modulation. Sensitivity analysis of the drive train identifies the weakest link in the drive train that limits the first torsional frequency to a low value. Finally, the significance of higher mode shapes on inter-lobe clearance distribution of the rotors is investigated.

  15. Experimental study on neon refrigeration system using commercial helium compressor

    Science.gov (United States)

    Ko, Junseok; Kim, Hyobong; Hong, Yong-Ju; Yeom, Hankil; Koh, Deuk-Yong; Park, Seong-Je

    2012-06-01

    In this study, we developed neon refrigeration system using commercial helium compressor which was originally designed for GM cryocooler. We performed this research as precedent study before developing neon refrigeration system for small-scale hydrogen liquefaction system. The developed system is based on precooled Linde-Hampson system with liquid nitrogen as precoolant. Design parameters of heat exchangers are determined from thermodynamic cycle analysis with operating pressure of 2 MPa and 0.4 MPa. Heat exchangers have concentric-tube heat exchanger configuration and orifice is used as Joule- Thomson expansion device. In experiments, pressure, temperature, mass flow rate and compressor input power are measured as charging pressure. With experimental results, the characteristics of heat exchanger, Joule-Thomson expansion and refrigeration effect are discussed. The developed neon refrigeration system shows the lowest temperature of 43.9 K.

  16. Performance Improvement of a Centrifugal Compressor by Passive Means

    Directory of Open Access Journals (Sweden)

    N. Sitaram

    2012-01-01

    Full Text Available The present experimental investigation deals with performance improvement of a low-speed centrifugal compressor by inexpensive passive means such as turbulence generator placed at different positions and partial shroud near the rotor blade tip. The experiments are carried out at three values of tip clearance, namely 2.2%, 5.1%, and 7.9% of rotor blade height at the exit. Performance tests are carried out for a total of 13 configurations. From these measurements, partial shroud is found to give the best performance. The improvement in the compressor performance may be due to the reduction of tip leakage flows by the small extension of partial shroud (2 mm on the pressure surface side. Although there is nominal change in performance due to turbulence generator (TG, TG has beneficial effect of increased operating range.

  17. Calculating High Speed Centrifugal Compressor Performance from Averaged Measurements

    Science.gov (United States)

    Lou, Fangyuan; Fleming, Ryan; Key, Nicole L.

    2012-12-01

    To improve the understanding of high performance centrifugal compressors found in modern aircraft engines, the aerodynamics through these machines must be experimentally studied. To accurately capture the complex flow phenomena through these devices, research facilities that can accurately simulate these flows are necessary. One such facility has been recently developed, and it is used in this paper to explore the effects of averaging total pressure and total temperature measurements to calculate compressor performance. Different averaging techniques (including area averaging, mass averaging, and work averaging) have been applied to the data. Results show that there is a negligible difference in both the calculated total pressure ratio and efficiency for the different techniques employed. However, the uncertainty in the performance parameters calculated with the different averaging techniques is significantly different, with area averaging providing the least uncertainty.

  18. Subsychronous vibration of multistage centrifugal compressors forced by rotating stall

    Science.gov (United States)

    Fulton, J. W.

    1987-01-01

    A multistage centrifugal compressor, in natural gas re-injection service on an offshore petroleum production platform, experienced subsynchronous vibrations which caused excessive bearing wear. Field performance testing correlated the subsynchronous amplitude with the discharge flow coefficient, demonstrating the excitation to be aerodynamic. Adding two impellers allowed an increase in the diffuser flow angle (with respect to tangential) to meet the diffuser stability criteria based on factory and field tests correlated using the theory of Senoo (for rotating stall in a vaneless diffuser). This modification eliminated all significant subsynchronous vibrations in field service, thus confirming the correctness of the solution. Other possible sources of aerodynamically induced vibrations were considered, but the judgment that those are unlikely has been confirmed by subsequent experience with other similar compressors.

  19. Small, high pressure ratio compressor: Aerodynamic and mechanical design

    Science.gov (United States)

    Bryce, C. A.; Erwin, J. R.; Perrone, G. L.; Nelson, E. L.; Tu, R. K.; Bosco, A.

    1973-01-01

    The Small, High-Pressure-Ratio Compressor Program was directed toward the analysis, design, and fabrication of a centrifugal compressor providing a 6:1 pressure ratio and an airflow rate of 2.0 pounds per second. The program consists of preliminary design, detailed areodynamic design, mechanical design, and mechanical acceptance tests. The preliminary design evaluate radial- and backward-curved blades, tandem bladed impellers, impeller-and diffuser-passage boundary-layer control, and vane, pipe, and multiple-stage diffusers. Based on this evaluation, a configuration was selected for detailed aerodynamic and mechanical design. Mechanical acceptance test was performed to demonstrate that mechanical design objectives of the research package were met.

  20. A High Reliability Gas-driven Helium Cryogenic Centrifugal Compressor

    CERN Document Server

    Bonneton, M; Gistau-Baguer, Guy M; Turcat, F; Viennot, P

    1998-01-01

    A helium cryogenic compressor was developed and tested in real conditions in 1996. The achieved objective was to compress 0.018 kg/s Helium at 4 K @ 1000 Pa (10 mbar) up to 3000 Pa (30 mbar). This project was an opportunity to develop and test an interesting new concept in view of future needs. The main features of this new specific technology are described. Particular attention is paid to the gas bearing supported rotor and to the pneumatic driver. Trade off between existing technologies and the present work are presented with special stress on the bearing system and the driver. The advantages are discussed, essentially focused on life time and high reliability without maintenance as well as non pollution characteristic. Practical operational modes are also described together with the experimental performances of the compressor. The article concludes with a brief outlook of future work.

  1. Dynamical System Analysis of Unsteady Phenomena in Centrifugal Compressor

    Institute of Scientific and Technical Information of China (English)

    YasuyukiKomatsubara; ShimpeiMizuki

    1997-01-01

    Surge and rotating stall occurring in a centrifugal compressor system are investigated by using a phase portrait reconstruction method.From experimentally measured time series of data,the method clarified the cyclic behavior of surge.For rotating stall,there still remain problems in the phase portrait due to the chaotic behavior.However,the results obtained by the present method are able to provide new insights to the modelings for surge and rotating stall.Surge and roatting stall occurring in a centrifugal compressor system are investigated by using a phase portrait reconstruction method.From experimentally measured time series of data,the method clarified the cylcic behavior of surge.For rotating stall,there still remain problems in the phase portrait due to the chaotic behavior.However,the results obtained by the present method are able to provide new insights to the modelings for surge and rotating stall.

  2. RF modulation studies on the S band pulse compressor

    CERN Document Server

    Shu, G; Pei, S; Xiao, O

    2015-01-01

    An S band SLED-type pulse compressor has been manufactured by IHEP to challenge the 100 MW maximum input power, which means the output peak power is about 500 MW at the phase reversal time. In order to deal with the RF breakdown problem, the dual side-wall coupling irises model was used. To further improve the reliability at very high power, amplitude modulation and phase modulation with flat-top output were taken into account. The RF modulation studies on an S-band SLED are presented in this paper. Furthermore, a method is developed by using the CST Microwave Studio transient solver to simulate the time response of the pulse compressor, which can be a verification of the modulate theory. In addition, the experimental setup was constructed and the flat-top output is obtained in the low power tests.

  3. Mixed Lubrication Analysis for Journal Bearings in Rotary Compressors

    Science.gov (United States)

    Hattori, Hitoshi; Ito, Yasutaka; Hirayama, Takuya; Miura, Kazuhiko

    This paper describes the numerical analysis of mixed lubrication and the calculated results for journal bearings in rotary compressors. In this analysis, the modified Reynolds equation and the elastic contact equation, considering the effect of surface roughness, are solved as a coupled problem, and then influences of the elastic deformation of the bearing surface and the motion of the rotating shaft with bending deformation are also considered. The appearance of solid contact in hydrodynamic lubrication can be addressed by the analysis. Influences of the rotating speed and the surface roughness on the lubrication characteristics of the journal bearing were investigated by using the mixed lubrication analysis. As the results, it is made clear that the solid contact on the bearing surface occurs in the discharge process of rotary compressors. Furthermore, the contact pressure and the contact area decrease, even though the oil film thickness decreases, when the surface roughness becomes small.

  4. The Force Analysis of Reciprocating Compressor Valve Using CFD%往复式压缩机气阀受力的CFD分析

    Institute of Scientific and Technical Information of China (English)

    武炳; 江志农

    2011-01-01

    针对采用顶开进气阀式进行全量程无级气量调节的往复式压缩机工作过程进行CFD模拟,得出往复式压缩机工作过程中气缸和气阀部分的气体压力场分布,计算出了阀片所受的最大气体顶推力,为气量调节系统的设计提供了依据.%A working process of reciprocating compressor, which uses pressing-off inlet valve for whole measuring range stepless gas-regulating, is simulated using CFD. The air pressure filed distribution in cylinder and valve during the working process of reciprocating compressor is obtained, and the largest gas jacking force on valve is calculated. The results provide basis for the design of gas capacity regulation system.

  5. Screw compressors and their reliability. Oil and bearing problems with the example of screw compressors in refrigeration engineering. Schraubenverdichter und ihre Zuverlaessigkeit. Oel- und Lagerungsproblematik am Beispiel von Schraubenverdichtern in der Kaeltetechnik

    Energy Technology Data Exchange (ETDEWEB)

    Hesse, U.; Rinne, F. (Hannover Univ. (Germany). Inst. fuer Kaeltetechnik und Angewandte Waermetechnik); Kruse, H. (Forschungszentrum fuer Kaeltetechnik und Waermepumpen GmbH, Hannover (Germany))

    1991-10-01

    Compressors are among others differentiated according to the position of their oil tank which has an influence on the oil-refrigerant system and the necessary oil viscosities. Damage on screw compressors mainly concern the lubricating system, a fact which led to the development of refrigerant-screw compressors without oil pump. The report goes after presenting the refrigerator oils used in screw-type compressor systems and their refrigerants into the question of the effective viscosity in the bearing. Finally bearing examples for screw compressors are given and a method is presented with which bearing loads in the compressor can be measured. (BWI).

  6. Dedicated monitoring and machinery protection systems on reciprocating compressors

    Energy Technology Data Exchange (ETDEWEB)

    Grande, Alvaro; Wenisch, Markus [Hoerbiger Ventilwerke GmbH and Co KG, Wien (Austria); Jacobs, Denis [HOERBIGER do Brasil Industria de Equipamentos, Cajamar, SP (Brazil)

    2012-07-01

    Growing demands on reciprocating compressors (recips) in the process gas industry require particular solutions for machinery protection and performance monitoring systems. Compared to rotating equipment, monitoring systems for recips have to consider the special mechanical and physical characteristics, such as oscillating masses, variable vibration behaviour and varying operating conditions. Furthermore, they provide valuable information about the performance of cylinder related components allowing the operator the optimization of efficiency and availability, and therefore increase production. (author)

  7. Hybrid compressor design for a 10PW laser

    Directory of Open Access Journals (Sweden)

    Novák J.

    2013-05-01

    Full Text Available The ELI beamlines facility will house a 10PW laser with ultrashort pulse duration. The laser damage threshold of the coatings limits the minimum size of the last compression grating. Due to production restrictions, the last grating has to be tiled. This design was produced in order to minimize the total number of gratings in the compressor together with the spatial requirements.

  8. Recontouring of Jet Engine Compressor Blades by Flow Simulation

    OpenAIRE

    Herwart Hönen; Matthias Panten

    2001-01-01

    In modern jet propulsion systems the core engine has an essential influence on the total engine performance. Especially the high pressure compressor plays an important role in this scheme. Substantial factors here are losses due to tip clearance effects and aerodynamic airfoil quality. During flight operation the airfoils are subject to wear and tear on the leading edge. These effects cause a shortening of the chord length and the leading edge profiles become deformed. This results in a deter...

  9. Computational and Experimental Study of an Industrial Centrifugal Compressor Volute

    Institute of Scientific and Technical Information of China (English)

    HarriPitkanen; HannuEsa; 等

    2000-01-01

    A centrifugal compressor with a vaneless diffuser was studied experimentally and numericallly.The main target of the study was to analyze the volute flow.Two different volute geometries was studied.The numerical solution was done by using a steady-state RANS code at both design and off-design conditions.Both calculated and measured pressure and velocity distributions are presented.

  10. Inverse Design of Centrifugal Compressor Stages Using a Meanline Approach

    OpenAIRE

    Yuri Biba; Peter Menegay

    2004-01-01

    This article discusses an approach for determining meanline geometric parameters of centrifugal compressor stages given specified performance requirements. This is commonly known as the inverse design approach. The opposite process, that of calculating performance parameters based on geometry input is usually called analysis, or direct calculation. An algorithm and computer code implementing the inverse approach is described. As an alternative to commercially available inverse design codes...

  11. Design and Characterization of a Centrifugal Compressor Surge Test Rig

    OpenAIRE

    Kin Tien Lim; Se Young Yoon; Christopher P. Goyne; Zongli Lin; Allaire, Paul E.

    2011-01-01

    A detailed description of a new centrifugal compressor surge test rig is presented. The objective of the design and development of the rig is to study the surge phenomenon in centrifugal compression systems and to investigate a novel method of surge control by active magnetic bearing servo actuation of the impeller axial tip clearance. In this paper, we focus on the design, initial setup, and testing of the rig. The latter two include the commissioning of the rig and the experimental characte...

  12. Optimal Design of a Centrifugal Compressor Impeller Using Evolutionary Algorithms

    OpenAIRE

    Soo-Yong Cho; Kook-Young Ahn; Young-Duk Lee; Young-Cheol Kim

    2012-01-01

    An optimization study was conducted on a centrifugal compressor. Eight design variables were chosen from the control points for the Bezier curves which widely influenced the geometric variation; four design variables were selected to optimize the flow passage between the hub and the shroud, and other four design variables were used to improve the performance of the impeller blade. As an optimization algorithm, an artificial neural network (ANN) was adopted. Initially, the design of experiment...

  13. Centrifugal compressor flow instabilities at lowmass flow rate

    OpenAIRE

    Sundström, Elias

    2016-01-01

    Turbochargers play an important role in increasing the energetic efficiency andreducing emissions of modern power-train systems based on downsized recipro-cating internal combustion engines (ICE). The centrifugal compressor in tur-bochargers is limited at off-design operating conditions by the inception of flowinstabilities causing rotating stall and surge. They occur at reduced enginespeeds (low mass flow rates), i.e. typical operating conditions for a betterengine fuel economy, harming ICEs...

  14. Self-Recirculating Casing Treatment for a Radial Compressor

    Institute of Scientific and Technical Information of China (English)

    XIAO Jun; XU Wei; GU Chuangang; SHU Xinwei

    2009-01-01

    Casing treatment is a widely employed technique to increase the stall margins of turbomachineries. In the last several decades, many researches on casing treatment have been carried out. However, the mechanism of its expanding stall margins is still not very clear. Till now, most casing teatment schemes are designed for axial compressors, while the investigations on casing treatments in centrifugal compressors are rarely reported. Moreover, current investigation methods mainly focus on experiments, and perfect theoretical analysis is not yet feasible. In order to study the effectiveness and further the mechanism of casing treatments in centrifugal compressors, in this paper, a computationally based investigation of the impact of the self-recirculating casing treatment on the performance of a radial compressor is carried out. The results indicate that, by casing bleed and injection, the casing treatment with inclined blades in the cavity expands the stall margin most. At low mass flows, the reversed flow through the cavity with inclined blades develops the counter swirl flow in front of the impeller inlet, which is considered to benefit increasing the pressure rise from the injection port to the bleed port and thereby augment the recirculating flow. At 120% design speed, the stall margin is larger than that at the design speed. However, the cost of extending the stall margin is the reduction of isentropic efficiency. A mended casing treatment by shifting the bleed port upstream is also studied. It is demonstrated that, relative to the original casing treatment, this mend can improve the efficiency evidently notwithstanding a little narrowing of the flow range.

  15. AEROELASTIC INVESTIGATION OF AN ANNULAR TRANSONIC COMPRESSOR CASCADE: EXPERIMENTAL RESULTS

    OpenAIRE

    Chenaux, Virginie Anne; Ott, Peter; Zanker, Achim

    2015-01-01

    A reliable determination of the unsteady aerodynamic loads acting on the blades is essential to predict the aeroelastic stability of vibrating compressor cascades with accuracy. At transonic flow conditions, the vibration of the shock may change the blade aeroelastic behavior. Numerical tools still have difficulties to capture the physics associated to this effect. In order to increase the prediction’s accuracy, high quality experimental data at high spatial resolution is therefore required t...

  16. Numerical Analysis of Blade Geometry Generation Techniques for Centrifugal Compressors

    OpenAIRE

    Florin Iancu; John Trevino; Steven Sommer

    2007-01-01

    It is a known fact that machined impellers result in improved compressor performance compared to cast impellers of the same design. The performance improvements can be attributed to better surface finish, more accurate geometric definition (tighter dimensional tolerances), well-defined edges, and the lack of blade tip fillet on shrouded impellers. In addition, it has been observed through experimental investigations that the construction method of the impellers has an impact on performance. T...

  17. Effects of Different Blade Angle Distributions on Centrifugal Compressor Performance

    OpenAIRE

    Pekka Röyttä; Aki Grönman; Ahti Jaatinen; Teemu Turunen-Saaresti; Jari Backman

    2009-01-01

    A centrifugal compressor with three different shrouded 2D impellers is studied numerically. All impellers have the same dimensions, and they only differ in channel length and geometry. Noticeable differences in efficiency are observed. Two different turbulence models, Chien's k-ε and k-ω SST, are compared. For this case, k-ω SST was found more realistic. The hypothesis that pressure losses in a curved duct and in an impeller passage behave similarly is suggested and found inadequate.

  18. PECULIARITIES OF THE IDEALIZED CYCLES OF VAPOR COMPRESSOR REFRIGERATING MACHINES

    OpenAIRE

    Вассерман, А. А.; Лавренченко, Г. К.; Слынько, А. Г.

    2014-01-01

    Efficiency of the idealized cycles of vapor compressor refrigerating machines with adiabatic or isothermal compression of refrigerantwas investigated. To these cycles concern cycles with adiabatic compression of steam without regeneration (S-cycle) and with limiting regeneration (SR-cycle), and also with isothermal compression and limiting regeneration (T-cycle). Three characteristics of cycles are compared: refrigerating coefficient of performance e, specific-volume cooling capacity qv and t...

  19. Study On A Cooling System For Rotary Compressor

    OpenAIRE

    Zhang, Haifeng; Wang, Shuoyuan; Xie, Fei

    2012-01-01

    It is well known that the isothermal compression is an ideal process to consume least power for compressor. The isothermal compression can't be really reached, but can be approached by decreasing the discharge temperature during compression. For this purpose, a cooling system has been built in the paper. Firstly, an innovative circulation system has been built to absorb the heat generated by compression, which is segregated from the refrigeration circulation system. The principle and the stru...

  20. Trends in high performance compressors for petrochemical and natural gas industry in China

    Science.gov (United States)

    Zhao, Yuanyang; Li, Liansheng

    2015-08-01

    Compressors are the key equipment in the petrochemical and natural gas industry system. The performance and reliability of them are very important for the process system. The application status of petrochemical & natural gas compressors in China is presented in this paper. The present status of design and operating technologies of compressors in China are mentioned in this paper. The turbo, reciprocating and twin screw compressors are discussed. The market demands for different structure compressors in process gas industries are analysed. This paper also introduces the research and developments for high performance compressors in China. The recent research results on efficiency improvement methods, stability improvement, online monitor and fault diagnosis will also be presented in details.

  1. Investigation into the Interaction of Centrifugal Compressor Impeller and Vaneless Diffuser

    Institute of Scientific and Technical Information of China (English)

    YANG Ce; ZHANG Dian-zuo; MA Chao-chen; HU Liao-ping

    2006-01-01

    Centrifugal compressors with parallel-wall and contracting wall vaneless diffuser are designed by using centrifugal compressor computer-aided integrated design system. The internal flow fields of the compressor are calculated by solving three-dimensional Navier-Stokes equation. Four aspects are investigated and calculation results show that the total efficiencies and total pressure ratios of the compressor with contracting wall vaneless diffuser is higher than that of the compressor with parallel-wall. The jet and wake don't mix rapidly inside vaneless diffuser. The outlet blade lean angle doesn't affect the compressor performance. The greater the mass flow rate through impeller, the more uneven the velocity distribution at impeller outlet is.

  2. Speed and surge control for a lower order centrifugal compressor model

    Directory of Open Access Journals (Sweden)

    Jan T. Gravdahl

    1998-01-01

    Full Text Available A model of a variable speed centrifugal compression system is presented. The model is based on the work of Greitzer (1976, but the compressor characteristic is developed by modelling the losses in the compressor. For surge control, a close coupled valve is employed. This valve is placed immediately downstream of the compressor, and the pressure drop over the valve is used as the control variable. This makes it possible to manipulate the shape of the equivalent compressor, consisting of compressor and valve. The speed of the compressor is controlled with a PI-controller. Semi-global exponential stability of the model with the proposed controllers is proven by the use of Lyapunovs theorem.

  3. Stage-by-Stage and Parallel Flow Path Compressor Modeling for a Variable Cycle Engine

    Science.gov (United States)

    Kopasakis, George; Connolly, Joseph W.; Cheng, Larry

    2015-01-01

    This paper covers the development of stage-by-stage and parallel flow path compressor modeling approaches for a Variable Cycle Engine. The stage-by-stage compressor modeling approach is an extension of a technique for lumped volume dynamics and performance characteristic modeling. It was developed to improve the accuracy of axial compressor dynamics over lumped volume dynamics modeling. The stage-by-stage compressor model presented here is formulated into a parallel flow path model that includes both axial and rotational dynamics. This is done to enable the study of compressor and propulsion system dynamic performance under flow distortion conditions. The approaches utilized here are generic and should be applicable for the modeling of any axial flow compressor design.

  4. A Study of Vibration Reduction of Rolling Piston Type Rotary Compressor

    Science.gov (United States)

    Yoshimura, Takao; Koyama, Takashi; Morita, Ichiro; Kobayashi, Masanori; Uetuji, Toshio

    In general,the vibration of rolling piston type rotary compressors is greater than that of reciprocating compressors because the compressor-motor unit is fixed to the shell. It is therefore necessary that refrigerators utilizing rotary compressors incorporated a vibration-proof design. This paper refers to the experimental vibration reduction study of rotary compressors (horizontally installed) for household refrigerators and other appliances. The vibration of rotary compressors consists of the rotational vibration caused by the speed variation of the shaft and of the imbalance vibration caused by the mass imbalance in the rotation system. There are various methods for reducing the rotational vibration. This study researched the dynamic damper. It will be shown that the dynamic damper,using a helical extension spring applied to the outside of the shell,is effective in reducing vibration. In regards to the imbalance vibration,this paper researched the influence of the number of correction planes and the accuracy of the balancing.

  5. DESIGN OF 8-4 AND 9-4 COMPRESSORS FORHIGH SPEED MULTIPLICATION

    Directory of Open Access Journals (Sweden)

    R. Marimuthu

    2013-01-01

    Full Text Available This study presents higher order compressors which can be effectively used for high speed multiplications. The proposed compressors offer less delay and area. But the Energy Delay Product (EDP is slightly higher than lower order compressors. The performance of 8×8, 16×16 and 24×24 multipliers using the proposed higher order compressors has been compared with the same multipliers using lower order compressors and found that the new structures can be used for high speed multiplications. These compressors are simulated with Cadence RTL complier at a temperature of 25°C with the supply voltage of 1.2 V.

  6. Pressure Pulsation Signal Analysis for Centrifugal Compressor Blade Crack Determination

    Directory of Open Access Journals (Sweden)

    Hongkun Li

    2014-01-01

    Full Text Available Blade is a key piece of component for centrifugal compressor. But blade crack could usually occur as blade suffers from the effect of centrifugal forces, gas pressure, friction force, and so on. It could lead to blade failure and centrifugal compressor closing down. Therefore, it is important for blade crack early warning. It is difficult to determine blade crack as the information is weak. In this research, a pressure pulsation (PP sensor installed in vicinity to the crack area is used to determine blade crack according to blade vibration transfer process analysis. As it cannot show the blade crack information clearly, signal analysis and empirical mode decomposition (EMD are investigated for feature extraction and early warning. Firstly, signal filter is carried on PP signal around blade passing frequency (BPF based on working process analysis. Then, envelope analysis is carried on to filter the BPF. In the end, EMD is carried on to determine the characteristic frequency (CF for blade crack. Dynamic strain sensor is installed on the blade to determine the crack CF. Simulation and experimental investigation are carried on to verify the effectiveness of this method. The results show that this method can be helpful for blade crack classification for centrifugal compressors.

  7. A gigawatt level repetitive rate adjustable magnetic pulse compressor.

    Science.gov (United States)

    Li, Song; Gao, Jing-Ming; Yang, Han-Wu; Qian, Bao-Liang; Li, Ze-Xin

    2015-08-01

    In this paper, a gigawatt level repetitive rate adjustable magnetic pulse compressor is investigated both numerically and experimentally. The device has advantages of high power level, high repetitive rate achievability, and long lifetime reliability. Importantly, dominate parameters including the saturation time, the peak voltage, and even the compression ratio can be potentially adjusted continuously and reliably, which significantly expands the applicable area of the device and generators based on it. Specifically, a two-stage adjustable magnetic pulse compressor, utilized for charging the pulse forming network of a high power pulse generator, is designed with different compression ratios of 25 and 18 through an optimized design process. Equivalent circuit analysis shows that the modification of compression ratio can be achieved by just changing the turn number of the winding. At the same time, increasing inductance of the grounded inductor will decrease the peak voltage and delay the charging process. Based on these analyses, an adjustable compressor was built and studied experimentally in both the single shot mode and repetitive rate mode. Pulses with peak voltage of 60 kV and energy per pulse of 360 J were obtained in the experiment. The rise times of the pulses were compressed from 25 μs to 1 μs and from 18 μs to 1 μs, respectively, at repetitive rate of 20 Hz with good repeatability. Experimental results show reasonable agreement with analyses. PMID:26329219

  8. A gigawatt level repetitive rate adjustable magnetic pulse compressor

    Science.gov (United States)

    Li, Song; Gao, Jing-Ming; Yang, Han-Wu; Qian, Bao-Liang; Li, Ze-Xin

    2015-08-01

    In this paper, a gigawatt level repetitive rate adjustable magnetic pulse compressor is investigated both numerically and experimentally. The device has advantages of high power level, high repetitive rate achievability, and long lifetime reliability. Importantly, dominate parameters including the saturation time, the peak voltage, and even the compression ratio can be potentially adjusted continuously and reliably, which significantly expands the applicable area of the device and generators based on it. Specifically, a two-stage adjustable magnetic pulse compressor, utilized for charging the pulse forming network of a high power pulse generator, is designed with different compression ratios of 25 and 18 through an optimized design process. Equivalent circuit analysis shows that the modification of compression ratio can be achieved by just changing the turn number of the winding. At the same time, increasing inductance of the grounded inductor will decrease the peak voltage and delay the charging process. Based on these analyses, an adjustable compressor was built and studied experimentally in both the single shot mode and repetitive rate mode. Pulses with peak voltage of 60 kV and energy per pulse of 360 J were obtained in the experiment. The rise times of the pulses were compressed from 25 μs to 1 μs and from 18 μs to 1 μs, respectively, at repetitive rate of 20 Hz with good repeatability. Experimental results show reasonable agreement with analyses.

  9. Experimental investigation on a high subsonic compressor cascade flow

    Directory of Open Access Journals (Sweden)

    Zhang Haideng

    2015-08-01

    Full Text Available With the aim of deepening the understanding of high-speed compressor cascade flow, this paper reports an experimental study on NACA-65 K48 compressor cascade with high subsonic inlet flow. With the increase of passage pressurizing ability, endwall boundary layer behavior is deteriorated, and the transition zone is extended from suction surface to the endwall as the adverse pressure gradient increases. Cross flow from endwall to midspan, mixing of corner boundary layer and the main stream, and reversal flow on the suction surface are caused by corner separation vortex structures. Passage vortex is the main corner separation vortex. During its movement downstream, the size grows bigger while the rotating direction changes, forming a limiting circle. With higher incidence, corner separation is further deteriorated, leading to higher flow loss. Meanwhile, corner separation structure, flow mixing characteristics and flow loss distribution vary a lot with the change of incidence. Compared with low aspect-ratio model, corner separation of high aspect-ratio model moves away from the endwall and is more sufficiently developed downstream the cascade. Results obtained present details of high-speed compressor cascade flow, which is rare in the relating research fields and is beneficial to mechanism analysis, aerodynamic optimization and flow control design.

  10. Compressor performance of two-stage turbocharging system

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    To study the performance of high and low stage compressors and that of the system as a whole,a two-stage turbocharging system was matched,and a special two-stage turbocharging system test bench was built.For each test curve,the speeds of the two stage turbochargers were adjusted to the fixed data,and a compressor performance experiment was performed.The results showed many differences between the corrected mass flow and the actual mass flow of the high pressure (HP) stage compressor.To find out the actual supercharging effect of the two-stage turbocharging system,it is better to adopt the actual mass flow.The two-stage turbocharging system in this paper has much higher efficiency under most operating conditions if the pressure ratio assignment is 1:1.The system can get very high supercharging pressure when the speeds of the two stage turbochargers are rather low,which ensures the system's security and reliability.

  11. Non-axisymmetric flow characteristics in centrifugal compressor

    Science.gov (United States)

    Wang, Leilei; Lao, Dazhong; Liu, Yixiong; Yang, Ce

    2015-06-01

    The flow field distribution in centrifugal compressor is significantly affected by the non-axisymmetric geometry structure of the volute. The experimental and numerical simulation methods were adopted in this work to study the compressor flow field distribution with different flow conditions. The results show that the pressure distributionin volute is characterized by the circumferential non-uniform phenomenon and the pressure fluctuation on the high static pressure zone propagates reversely to upstream, which results in the non-axisymmetric flow inside the compressor. The non-uniform level of pressure distribution in large flow condition is higher than that in small flow condition, its effect on the upstream flow field is also stronger. Additionally, the non-uniform circumferential pressure distribution in volute brings the non-axisymmetric flow at impeller outlet. In different flow conditions,the circumferential variation of the absolute flow angle at impeller outlet is also different. Meanwhile, the non-axisymmetric flow characteristics in internal impeller can be also reflected by the distribution of the mass flow. The high static pressure region of the volute corresponds to the decrease of mass flow in upstream blade channel, while the low static pressure zone of the volute corresponds to the increase of the mass flow. In small flow condition, the mass flow difference in the blade channel is bigger than that in the large flow condition.

  12. CFD comparison with centrifugal compressor measurements on a wide operating range

    OpenAIRE

    Arnou D.; Fabrie P.; Le Sausse P.; Clunet F.

    2013-01-01

    Centrifugal compressors are widely used in industrial applications thanks to their high efficiency. They are able to provide a wide operating range before reaching the flow barrier or surge limits. Performances and range are described by compressor maps obtained experimentally. After a description of performance test rig, this article compares measured centrifugal compressor performances with computational fluid dynamics results. These computations are performed at steady conditions with R134...

  13. Object-oriented simulation of reciprocating compressors: Numerical verification and experimental comparison

    OpenAIRE

    Mohan Damle, Rashmin; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David; Castro González, Jesús; Oliva Llena, Asensio

    2011-01-01

    Numerical simulation of reciprocating compressors is important for the design, development, improvement and optimization of the elements constituting the compressor circuit. In this work, an object-oriented unstructured modular numerical simulation of reciprocating compressors is presented. Pressure correction approach is applied for the resolution of tubes, chambers and compression chambers, while valve dynamics are modelled assuming a spring-mass system having single degree of freedom. The ...

  14. Noise analysis of fluid-valve system in a linear compressor using CAE

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jun Ho; Jeong, Weui Bong [Pusan National Univ., Busan (Korea, Republic of); Kim, Dang Ju [LOCUS Co., Ltd., Busan (Korea, Republic of)

    2009-07-01

    A linear compressor in a refrigerator uses piston motion to transfer refrigerant so its efficiency is higher than a previous reciprocal compressor. Because of interaction between refrigerant and valves system in the linear compressor, however, noise has been a main issue. In spite of doing many experimental researches, there is no way to rightly predict the noise. In order to solve this limitation, the CAE analysis is applied. For giving credit to these computational data, all of the data are experimentally validated.

  15. Study on the dynamic compressor characteristics transformation at the aspiration parameters and rotation modification

    OpenAIRE

    Petrilean, Dan Codrut

    2006-01-01

    The fresh calculation of the centrifugal-type compressor characteristics at the aspirations parameters and rotations modification has a significant importance in practice, because the tests of compressors generate high energetic consumptions. The solution of the problem is based on replacement of the velocity triangles similitude condition (practically impossible to achieve during all the stages of the compressor), on condition that maintaining the velocity triangles s...

  16. Comparative Study of Unsteady Flows in a Transonic Centrifugal Compressor with Vaneless and Vaned Diffusers

    OpenAIRE

    Cui Michael M.

    2005-01-01

    To reduce vibration and noise level, the impeller and diffuser blade numbers inside an industrial compressor are typically chosen without common divisors. The shapes of volutes or collectors in these compressors are also not axis-symmetric. When impeller blades pass these asymmetric structures, the flow field in the compressor is time-dependent and three-dimensional. To obtain a fundamental physical understanding of these three-dimensional unsteady flow fields and assess their impact on the c...

  17. The Dynamics of Stall and Surge Behavior in Axial-Centrifugal Compressors

    OpenAIRE

    Cousins, William T.

    1997-01-01

    The phenomena of stall and surge in axial-centrifugal compressors is investigated through high-response measurements of both the pressure field and the flowfield throughout the surge cycle. A unique high-response forward-facing and aft-facing probe provides flow information. Several axial-centrifugal compressors are examined, both in compressor rigs and engines. Extensive discussion is presented on the differences in axial and centrifugal rotors and their effect on the system response char...

  18. Stall Margin Improvement in a Centrifugal Compressor through Inducer Casing Treatment

    OpenAIRE

    V. V. N. K. Satish Koyyalamudi; Quamber H. Nagpurwala

    2016-01-01

    The increasing trend of high stage pressure ratio with increased aerodynamic loading has led to reduction in stable operating range of centrifugal compressors with stall and surge initiating at relatively higher mass flow rates. The casing treatment technique of stall control is found to be effective in axial compressors, but very limited research work is published on the application of this technique in centrifugal compressors. Present research was aimed to investigate the effect of casing t...

  19. Comparative Study of Unsteady Flows in a Transonic Centrifugal Compressor with Vaneless and Vaned Diffusers

    OpenAIRE

    Michael M. Cui

    2005-01-01

    To reduce vibration and noise level, the impeller and diffuser blade numbers inside an industrial compressor are typically chosen without common divisors. The shapes of volutes or collectors in these compressors are also not axis-symmetric. When impeller blades pass these asymmetric structures, the flow field in the compressor is time-dependent and three-dimensional. To obtain a fundamental physical understanding of these three-dimensional unsteady flow fields and assess ...

  20. Comparison of flow characteristics of centrifugal compressors by numerical modelling of flow

    OpenAIRE

    Guzović, Zvonimir; Baburić, Mario; Matijašević, Dubravko

    2015-01-01

    The centrifugal impellers are used in a wide variety of turbo-machineries, ranging from low pressure fans for cooling of electric motor to high pressure ratio gas turbine compressors, from tiny cryo-cooler compressors to large industrial petrochemical compressor stations. The relative flow in centrifugalimpeller is very complex due to different fluid dynamics phenomenonand their interactions. It is subjected to the complex secondary flows and significant separation of the boundary layers, whi...

  1. A New Optimization Method for Centrifugal Compressors Based on 1D Calculations and Analyses

    OpenAIRE

    Pei-Yuan Li; Chu-Wei Gu; Yin Song

    2015-01-01

    This paper presents an optimization design method for centrifugal compressors based on one-dimensional calculations and analyses. It consists of two parts: (1) centrifugal compressor geometry optimization based on one-dimensional calculations and (2) matching optimization of the vaned diffuser with an impeller based on the required throat area. A low pressure stage centrifugal compressor in a MW level gas turbine is optimized by this method. One-dimensional calculation results show that D3/D...

  2. Investigation of Flow Losses Through Discharge Line of Household Type Refrigerator Compressors

    OpenAIRE

    Yesilaydin, Ismail; Erbay, L. Berrin; Inan, Cemil

    2014-01-01

    Nowadays, increasing the efficiency of white goods and small house appliances has become necessity as a result of the technological developments, competition and energy policies. As a basic component of the cooling system, compressor is the most fundamental element for determining the performance and efficiency of the system. In hermetic compressors for household refrigerators, one of the major factors of total compressor efficiency is the discharge line flow efficiency. In this paper, the ef...

  3. High-energy pulse compressor using self-defocusing spectral broadening in anomalously dispersive media

    DEFF Research Database (Denmark)

    2015-01-01

    A method and a pulse compressor (1) for compressing an optical pulse, wherein the pulse compressor comprising a bulk quadratic nonlinear medium (2) adapted for generating a negative nonlinear phase variation on the optical pulse and having a negative group-velocity dispersion, and a dispersive un...... subsequently be compressed by providing normal dispersion. As KDP crystals can be glued together, large apertures of the pulse compressor are possible making this method suitable for pulse compression in Joule-class lasers....

  4. Refrigerator with variable capacity compressor and cycle priming action through capacity control and associated methods

    Energy Technology Data Exchange (ETDEWEB)

    Gomes, Alberto Regio; Litch, Andrew D.; Wu, Guolian

    2016-03-15

    A refrigerator appliance (and associated method) that includes a condenser, evaporator and a multi-capacity compressor. The appliance also includes a pressure reducing device arranged within an evaporator-condenser refrigerant circuit, and a valve system for directing or restricting refrigerant flow through the device. The appliance further includes a controller for operating the compressor upon the initiation of a compressor ON-cycle at a priming capacity above a nominal capacity for a predetermined or calculated duration.

  5. ISOTHERMAL ROTARY COMPRESSOR: THE WAY OF COMPRESSION OF GASES, THE BASIC CIRCUIT AND METHOD OF CALCULATION

    OpenAIRE

    Бондарь, В. П.; Жукова, С. В.

    2015-01-01

    At perfection of compressors seeks to provide the isothermal of process of compression. In real designs of existing compressors that is not possible to achieve. The practical way of compression of gases on an isotherm is described at present article. The basic circuit of experimental installation, results of experiment and the created method on their basis of calculation of process of compression of the biphase stream are resulted. The design and the circuit of compressor in which the process...

  6. Noise analysis of fluid-valve system in a linear compressor using CAE

    International Nuclear Information System (INIS)

    A linear compressor in a refrigerator uses piston motion to transfer refrigerant so its efficiency is higher than a previous reciprocal compressor. Because of interaction between refrigerant and valves system in the linear compressor, however, noise has been a main issue. In spite of doing many experimental researches, there is no way to rightly predict the noise. In order to solve this limitation, the CAE analysis is applied. For giving credit to these computational data, all of the data are experimentally validated.

  7. Investigation on wind energy-compressed air power system

    Institute of Scientific and Technical Information of China (English)

    贾光政; 王宣银; 吴根茂

    2004-01-01

    Wind energy is a pollution free and renewable resource widely distributed over China. Aimed at protecting the environment and enlarging application of wind energy, a new approach to application of wind energy by using compressed air power to some extent instead of electricity put forward. This includes: explaining the working principles and characteristics of the wind energy-compressed air power system; discussing the compatibility of wind energy and compressor capacity; presenting the theoretical model and computational simulation of the system. The obtained compressor capacity vs wind power relationship in certain wind velocity range can be helpful in the designing of the wind power-compressed air system. Results of investigations on the application of high-pressure compressed air for pressure reduction led to conclusion that pressure reduction with expander is better than the throttle regulator in energy saving.

  8. An Experimental Study of Three-Dimensional Characteristics of Turbulent Wakes of Axial Compressor Rotors

    Institute of Scientific and Technical Information of China (English)

    Hongwei MA; Haokang JIANG

    2005-01-01

    This paper presents an experimental investigation of the characteristics of three-dimensional turbulent wakes of an isolated axial compressor rotor and a single-stage axial compressor rotor. The wakes were measured from hub to tip using a single-slant hot-wire and a four-hole conical high frequency pressure probe. The experiments were made at both design and near stall conditions. Variations of mean velocities, total pressure, static pressure and turbulence stresses in the wakes are shown and interpreted. The experimental data from the isolated compressor rotor wake are compared with that from the single-stage compressor rotor.

  9. A miniature Rotary Compressor with a 1:10 compression ratio

    Science.gov (United States)

    Dmitriev, Olly; Tabota, Eugene; Arbon EurIng, Ian; FIMechE, CEng

    2015-08-01

    Micro compressors have applications in medical devices, robotics and “nanosatellites”. The problem of active cooling for photo detectors in “nano-satellites” becomes more important because the majority of space missions target Earth observation, and passive cooling does not provide the required temperatures to achieve the desired SNR levels. Reciprocating compressors used in cryocoolers cause vibrations. VERT Rotors has built an ultralow-vibration rotary compressor with 40mm-long screws, and our prototype delivered 1:10 compression ratio. This “nano” compressor is a non-conventional conical type consisting of an Inner conical screw rotor revolving inside an Outer screw rotor.

  10. Development of a linear compressor for two-stage pulse tube cryocoolers

    Institute of Scientific and Technical Information of China (English)

    Peng-da YAN; Wei-li GAO; Guo-bang CHEN

    2009-01-01

    A valveless linear compressor was built up to drive a self-made two-stage pulse tube cryocooler. With a designed maximum swept volume of 60 cm~3, the compressor can provide the cryocooler with a pressure volume (PV) power of 400 W.Preliminary measurements of the compressor indicated that both an efficiency of 35%~55% and a pressure ratio of 1.3~1.4 could be obtained. The two-stage pulse tube cryocooler driven by this compressor achieved the lowest temperature of 14.2 K.

  11. Experimental on-stream elimination of resonant whirl in a large centrifugal compressor

    Science.gov (United States)

    Bhat, G. I.; Eierman, R. G.

    1984-01-01

    Resonant whirl condition during operation of a multi-stage centrifugal compressor at higher than anticipated speeds and loads was reported. The condition was diagnosed by a large scale computerized Machinery Condition Monitoring System (MACMOS). This computerized system verified that the predominant subsynchronous whirl frequency locked in on the first resonant frequency of the compressor rotor and did not vary with compressor speed. Compressor stability calculations showed the rotor system had excessive hearing stiffness and inadequate effective damping. An optimum bearing design which was developed to minimize the unbalance response and to maximize the stability threshold is presented.

  12. Analysis of an activated-carbon sorption compressor operating with gas mixtures

    Science.gov (United States)

    Tzabar, N.; Grossman, G.

    2012-10-01

    Sorption compressors elevate the pressure of gases and can provide a more or less continuous mass flow. Unlike mechanical compressors, sorption compressors have no moving parts, and therefore do not emit vibrations and are highly reliable. There exist different sorption compressors for different operating conditions and various gases. However, there are no published reports of sorption compressors for mixed gases. Such compressors, among other applications, may drive mixed-refrigerant Joule-Thomson cryocoolers. The adsorption of mixed gases is usually investigated under steady conditions, mainly for storage and separation processes. However, the sorption process in a compressor goes through varying states and mass changes; therefore, it differs from the common mixed gases adsorption applications. In this research a numerical analysis for mixed gas sorption compressors is developed, based on pure gas adsorption characteristics and the ideal adsorbed solution theory. Two pure gas adsorption models are used for calculating the conditions of the adsorbed phase: Langmuir and Sips; and the Peng-Robinson equation of state is used to calculate the conditions of the vapor phase. Two mixtures are investigated; nitrogen-methane and nitrogen-ethane. Finally, the analysis is verified against experimental results. This research provides initiatory observation for mixed gases sorption compressor in which each component is differently adsorbed.

  13. Computer-Aided Design System for CP Single-Screw Compressor

    Institute of Scientific and Technical Information of China (English)

    SHEN Jing-feng; YAO Fu-sheng

    2006-01-01

    To design various optimum parameters and simulate the working process of CP single-screw compressor,the Computer-Aided Design(CAD)system for the CP singlescrew compressor has been established.A new method based on computer graphics technology,database technology,object-oriented programming technology,and visual simulation technology has been adopted in this CAD system.The system has integrated solid modeling function with parameterization design function and animator simulation function based on analyzing the working principle of the CP single-screw compressor.The experimental results show fhat the CAD system for the CP single-screw compressor is practical and feasible.

  14. Performance improvement of standard turbo-compressor; Han`yo turbo asshukuki no seino kaizen

    Energy Technology Data Exchange (ETDEWEB)

    Hokari, T.; Hasegawa, K.; Ozaki, S.; Majima, K. [Ishikawajima-Harima Heavy Industries Co. Ltd., Tokyo (Japan)

    1999-05-01

    Abradable materials are soft and cause no contact damage to the impeller of the turbo-compressor. Using such materials for the inlet casing facing to the impeller allows very small clearances between the impeller and inlet casing, thus improving the compressor efficiency by 10% over conventional types. Changing the area of abradable material applied to the inlet casing identified the optimum area in which decrease of the compressor surge margin is minimized and efficiency is improved by 10%. As a result, turbo-compressors have the best performance when the abradable materials are applied from the impeller outlet to two-thirds of the forward location of the inlet casing. (author)

  15. Air leakage in refrigerated vans. Final report

    Energy Technology Data Exchange (ETDEWEB)

    1978-12-01

    The Air Leakage in Refrigerated Vans Project was initiated by the Department of Energy to assess the impact of air leakage on fuel consumption of highway transport refrigeration equipment. The project, conducted from September of 1977 to December of 1978 collected air leakage data on refrigerated trailers, containers and truck bodies. A Prototype Air Leakage Test Set was developed, designed and constructed to take measurements, and a total of 92 representative vehicles were examined. The results of the study indicate that air leakage causes a 25% increase in the average refrigeration load. However, the majority of transport refrigeration units are equipped with control systems that require the power to be supplied continuously, so that the potential reduction in fuel consumption that can be expected by reduced air leakage is limited. Alternative control techniques and power sources for the control and operation of refrigeration unit components other than the compressor could reduce fuel consumption by approximately 60%.

  16. AERODYNAMIC AND BLADING DESIGN OF MULTISTAGE AXIAL FLOW COMPRESSORS

    Science.gov (United States)

    Crouse, J. E.

    1994-01-01

    The axial-flow compressor is used for aircraft engines because it has distinct configuration and performance advantages over other compressor types. However, good potential performance is not easily obtained. The designer must be able to model the actual flows well enough to adequately predict aerodynamic performance. This computer program has been developed for computing the aerodynamic design of a multistage axial-flow compressor and, if desired, the associated blading geometry input for internal flow analysis. The aerodynamic solution gives velocity diagrams on selected streamlines of revolution at the blade row edges. The program yields aerodynamic and blading design results that can be directly used by flow and mechanical analysis codes. Two such codes are TSONIC, a blade-to-blade channel flow analysis code (COSMIC program LEW-10977), and MERIDL, a more detailed hub-to-shroud flow analysis code (COSMIC program LEW-12966). The aerodynamic and blading design program can reduce the time and effort required to obtain acceptable multistage axial-flow compressor configurations by generating good initial solutions and by being compatible with available analysis codes. The aerodynamic solution assumes steady, axisymmetric flow so that the problem is reduced to solving the two-dimensional flow field in the meridional plane. The streamline curvature method is used for the iterative aerodynamic solution at stations outside of the blade rows. If a blade design is desired, the blade elements are defined and stacked within the aerodynamic solution iteration. The blade element inlet and outlet angles are established by empirical incidence and deviation angles to the relative flow angles of the velocity diagrams. The blade element centerline is composed of two segments tangentially joined at a transition point. The local blade angle variation of each element can be specified as a fourth-degree polynomial function of path distance. Blade element thickness can also be specified

  17. FOREWORD: 9th International Conference on Compressors and their Systems

    Science.gov (United States)

    Kovacevic, Ahmed, Prof

    2015-08-01

    The 9th International Conference on Compressors and their Systems will be held in London from 5th - 9th September 2015, and as its Chairman, it is my pleasure to welcome you. This series of conferences started in 1999 organised by the Fluid Machinery Group of the Institution of Mechanical Engineers (IMechE) but since 2009 it has been managed by City University London in conjunction with the IMechE and the Institute of Refrigeration, both of which have been very proactive in promoting it. The Organising committee is grateful for their support and continued encouragement. This year, after rigorous reviewing, we have accepted over 80 technical papers for publication, the highest number in the conference history. On behalf of the organising committee I would like to thank the reviewers for their hard work and assistance. In addition to the main technical sessions, this year we have introduced a third day, specifically for Industry, to consider technology, business and market drivers on compressor developments. The traditional series of the short courses is this year continuing prior to the main event with the second short course/forum on Computational Fluid Dynamics in rotating positive displacement machines. I would like to extend my special thanks to our main sponsors, Holroyd PTG, Howden and Kapp Niels for their continuing support for the conference. With their generous contributions we have managed to keep the conference fees at the same level as in 2013, despite extending it to 3 days and holding it outside the University this year. The welcome reception on Sunday 6th September 2015 is dedicated to the celebration of the 20th anniversary of the Centre for Positive Displacement Compressors Technology which was formed at City University in 1995 with support from the Royal Academy of Engineering and Holroyd; its main aim being to assist British manufacturers of screw compressors. The Centre has since made a significant impact on the screw compressor world, far beyond

  18. Variable-Speed Induction Motor Drives for Aircraft Environmental Control Compressors

    Science.gov (United States)

    Mildice, J. W.; Hansen, I. G.; Schreiner, K. E.; Roth, M. E.

    1996-01-01

    New, more-efficient designs for aircraft jet engines are not capable of supplying the large quantities of bleed air necessary to provide pressurization and air conditioning for the environmental control systems (ECS) of the next generation of large passenger aircraft. System analysis and engineering have determined that electrically-driven ECS can help to maintain the improved fuel efficiencies; and electronic controllers and induction motors are now being developed in a NASA/NPD SBIR Program to drive both types of ECS compressors. Previous variable-speed induction motor/controller system developments and publications have primarily focused on field-oriented control, with large transient reserve power, for maximum acceleration and optimum response in actuator and robotics systems. The application area addressed herein is characterized by slowly-changing inputs and outputs, small reserve power capability for acceleration, and optimization for maximum efficiency. This paper therefore focuses on the differences between this case and the optimum response case, and shows the development of this new motor/controller approach. It starts with the creation of a new set of controller requirements. In response to those requirements, new control algorithms are being developed and implemented in an embedded computer, which is integrated into the motor controller closed loop. Buffered logic outputs are used to drive the power switches in a resonant-technology, power processor/motor-controller, at switching/resonant frequencies high enough to support efficient high-frequency induction motor operation at speeds up to 50,000-RPA

  19. A Cabin Air Separator for EVA Oxygen

    Science.gov (United States)

    Graf, John C.

    2011-01-01

    Presently, the Extra-Vehicular Activities (EVAs) conducted from the Quest Joint Airlock on the International Space Station use high pressure, high purity oxygen that is delivered to the Space Station by the Space Shuttle. When the Space Shuttle retires, a new method of delivering high pressure, high purity oxygen to the High Pressure Gas Tanks (HPGTs) is needed. One method is to use a cabin air separator to sweep oxygen from the cabin air, generate a low pressure/high purity oxygen stream, and compress the oxygen with a multistage mechanical compressor. A main advantage to this type of system is that the existing low pressure oxygen supply infrastructure can be used as the source of cabin oxygen. ISS has two water electrolysis systems that deliver low pressure oxygen to the cabin, as well as chlorate candles and compressed gas tanks on cargo vehicles. Each of these systems can feed low pressure oxygen into the cabin, and any low pressure oxygen source can be used as an on-board source of oxygen. Three different oxygen separator systems were evaluated, and a two stage Pressure Swing Adsorption system was selected for reasons of technical maturity. Two different compressor designs were subjected to long term testing, and the compressor with better life performance and more favorable oxygen safety characteristics was selected. These technologies have been used as the basis of a design for a flight system located in Equipment Lock, and taken to Preliminary Design Review level of maturity. This paper describes the Cabin Air Separator for EVA Oxygen (CASEO) concept, describes the separator and compressor technology trades, highlights key technology risks, and describes the flight hardware concept as presented at Preliminary Design Review (PDR)

  20. 机载离心式制冷压缩机设计及特性分析%Airborne centrifugal refrigerating compressor design and characteristic analysis

    Institute of Scientific and Technical Information of China (English)

    高峰; 张兴娟; 袁修干

    2013-01-01

    A key technique which is critical to design vapor cycle system ( VCS) of the new-generation high-performance fighter aircraft is to develop a super-mini compressor with 50kW cooling capacity. Due to the small air rate flowing through the mini compressor, the designing experience which was used for the massive flow-rate compressor mostly cannot be completely applied to the designing and prediction for the super mini centrifugal refrigeration compressor. In line with the experimental data, design scheme was proposed. The expressions to picture the characteristics of the compressor, such as efficiency and compression ratio, were developed. The analytical calculation results are approximation to the experimental measurements. All aforementioned studies can supply necessary technical support to the design, research and development of refrigeration compressor in VCS adopted in high-performance fighter aircrafts.%开发制冷量等级为50 kW的超级小型化离心式制冷压缩机是发展新一代战斗机蒸发循环系统的关键技术.由于小流量特点,工业中使用的大型离心式制冷压缩机设计经验不能完全适用于小型离心式制冷压缩机设计及工作特性的预测.基于试验,提出相关设计方案,通过建立小流量离心式压缩机效率、压比等的特性计算方程,对所设计的压缩机进行性能预测,经试验数据验证,计算结果与试验数据较为接近.该研究结果可为国内发展机载蒸发循环用离心式制冷压缩机提供技术支持.