The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Bengt Sunden - One of the best experts on this subject based on the ideXlab platform.
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impact of Discharge Port configurations on the performance of sliding vane rotary compressors with a rotating cylinder
Applied Thermal Engineering, 2021Co-Authors: Yaping Chen, Yunhui Jiang, Bengt SundenAbstract:Abstract With the increasing requirements of compressed gas energy storage systems for compressors and expanders, sliding vane rotary compressors are worth trying. To study the influence of different configurations of Discharge Ports on the performance of compressors, numerical simulations are conducted on the innovative sliding vane compressors with a rotating cylinder. The reliable Renormalization Group k-e turbulent model is adopted in Fluent 2020R1. The results show that as the coverage angle increases, the averaged mass flow rates increase, the averaged exhaust gas temperature decreases and the leakage between the rotor and rotating cylinder and at sliding vane tips decrease. When the coverage angle increases from 15° to 45° at the central position angle of −28°, the volumetric efficiency increases from 89.38% to 92.65% while the isentropic efficiency increases from 76.43% to 86.19%. When the central position angles range from −28°, −23° to −18° at the coverage angle of 30°, the farther the Discharge Port is to the narrowest gap between the rotor and cylinder, the lower the outlet temperature, the less the leakage flow, and the higher the isentropic efficiency. The scheme with the central angle of −28° and coverage angle of 45° is recommended as the best one.
Shu Pengcheng - One of the best experts on this subject based on the ideXlab platform.
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theoretical and experimental study on indicator diagram of twin screw refrigeration compressor
International Journal of Refrigeration-revue Internationale Du Froid, 2004Co-Authors: Wu Huage, Xing Ziwe, Shu PengchengAbstract:Abstract In this paper a new mathematical model for calculating the indicator diagram of twin screw refrigeration compressor is presented firstly. The geometric parameters related to the rotation angle of male rotor are used in the model such as groove volume, suction and Discharge Port area, slide valve bypass Port area, leakage area etc. The effects of internal leakage through five paths, oil injection, gas–oil heat transfer, refrigerant property and partial loading etc. are taken into account simultaneously and separately in the theoretical study. To verify the model and the calculated p–V indicator diagram, experimental recording of p–V indicator diagram of twin screw refrigeration compressor is carried out. Various indicator diagrams are recorded successfully by a small pressure sensor embedded in the bottom of female rotor at the Discharge side. The results of theoretical calculation are in good agreement with the measured data, which lead to conclusion that the model can be used as a powerful tool for performance prediction and product development.
S Jeong - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation on convective heat transfer mechanism in a scroll compressor
International Journal of Refrigeration-revue Internationale Du Froid, 2006Co-Authors: K Jang, S JeongAbstract:This paper describes an experimental study on the convective heat transfer inside the scroll compressor. An experimental refrigeration system is composed with extensive instrumentations in the compressor that is operated at variable speeds. The 13 thermocouples installed inside the compressor monitor the temperatures of the scroll wrap during compression process of refrigerant. The temperature and the pressure of refrigerant at suction, and the pressure at Discharge Ports are measured, and applied to the numerical simulation as the operating condition parameters. The temperature measured at the Discharge Port is used to verify the simulation result with relevant heat transfer coefficient. This paper describes the effect of motion of the orbiting scroll on the convective heat transfer in the scroll wraps. Separate experiments are performed to investigate the heat transfer in such a peculiar physical condition. With this experimental result, the effect of the oscillation of the wall on the heat transfer is quantitatively analyzed and applied to the simulation of compression process in scroll compressor. The whole consecutive compression processes in the scroll compressor is simulated in detail by solving equations of mass and energy balance for the refrigerant. The modified heat transfer coefficient correlation considering the effect of motion of the orbiting scroll predicts the Discharge temperature better than other typical heat transfer coefficients.
Yaping Chen - One of the best experts on this subject based on the ideXlab platform.
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impact of Discharge Port configurations on the performance of sliding vane rotary compressors with a rotating cylinder
Applied Thermal Engineering, 2021Co-Authors: Yaping Chen, Yunhui Jiang, Bengt SundenAbstract:Abstract With the increasing requirements of compressed gas energy storage systems for compressors and expanders, sliding vane rotary compressors are worth trying. To study the influence of different configurations of Discharge Ports on the performance of compressors, numerical simulations are conducted on the innovative sliding vane compressors with a rotating cylinder. The reliable Renormalization Group k-e turbulent model is adopted in Fluent 2020R1. The results show that as the coverage angle increases, the averaged mass flow rates increase, the averaged exhaust gas temperature decreases and the leakage between the rotor and rotating cylinder and at sliding vane tips decrease. When the coverage angle increases from 15° to 45° at the central position angle of −28°, the volumetric efficiency increases from 89.38% to 92.65% while the isentropic efficiency increases from 76.43% to 86.19%. When the central position angles range from −28°, −23° to −18° at the coverage angle of 30°, the farther the Discharge Port is to the narrowest gap between the rotor and cylinder, the lower the outlet temperature, the less the leakage flow, and the higher the isentropic efficiency. The scheme with the central angle of −28° and coverage angle of 45° is recommended as the best one.
Weilin Zhuge - One of the best experts on this subject based on the ideXlab platform.
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unsteady characteristic and flow mechanism of a scroll compressor with novel Discharge Port for electric vehicle air conditioning
International Journal of Refrigeration-revue Internationale Du Froid, 2020Co-Authors: Rongchao Zhao, Weihua Li, Weilin ZhugeAbstract:Abstract Scroll compressor is a key component of the air conditioner/heat pump system in electric vehicle. This paper focuses on the impacts of Discharge Port design on the transient performance and flow mechanism of the scroll compressor. A three-dimensional unsteady computational fluid dynamic model is established and validated. The computational domain includes inlet duct, scroll working chamber, Discharge Port, check valve, plenum chamber and outlet duct. R134a is used as the working fluid. The impacts of the position of the conventional circular Port on the transient characteristic and flow loss mechanism of the scroll compressor are studied. It is found that large pressure difference between the two central chambers is resulted from discharging time difference of the two chambers. It inevitably leads to under compression in downside chamber and over compression in the upside chamber at designed condition. The conventional circular Discharge Port cannot address this problem. Therefore, a novel Discharge Port with a tail is proposed to retard the Discharge time of the downside chamber and advance that of the upside chamber. It is found that the isentropic efficiency of the scroll compressor is improved by 2.4%. The maximum pressure unbalance between the upside chamber and downside chamber is reduced by 50%.