Numerical and Experimental Research on the Discharge Noise of Twin-screw Refrigeration Compressors

doi:10.3901/JME.2017.20.169

Abstract

Abstract: A physical model for the discharge process simulation of a R22 semi-hermetic twin-screw refrigeration compressors is presented. The area change of an axial discharge orifice has been taken into consideration. The dynamic numerical simulation of discharge flow fields is carried out by the software of Fluent. Then the discharge noise spectrum of the compressor is obtained by making the Fluent simulation results as the boundary conditions of LMS. An experimental study is conducted to verify the model's accuracy. A structural optimization of the compressor's discharge end is performed by the analysis of simulation and experimental results. It is concluded that the pressure pulsation in the discharge orifice is big and it is attenuated in the discharge cavity. The sleeking of discharge flow passageway and opening of radial discharge orifice is good for the whole compressor and can reduce the pressure loss significantly. Both simulation and experimental results show that the optimization reduces the noise of the compressor, indicating that the method in this paper can applied for the optimization design of twin-screw refrigeration compressors.

Key words: dynamic mesh, gas pulsation, numerical simulation, twin-screw compressor

CLC Number:

TH455
TB535

SHEN Jiubing, WANG Ruixin, ZHOU Minglong, CHEN Wenqing. Numerical and Experimental Research on the Discharge Noise of Twin-screw Refrigeration Compressors[J]. Journal of Mechanical Engineering, 2017, 53(20): 169-175.

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