Research on Characteristics of Twin-screw Refrigeration Compressor

Abstract

：Twin-screw refrigeration compressors have been widely used due to their unique advantages, but owing to their complex rotor structure and profile design. The performance of twin-screw refrigeration compressors is generally predicted by one-dimensional numerical simulation or empirical methods, but this kind of method cannot obtain the distribution of the fluid pressure field and temperature field inside the compressor. A three-dimensional model is established based on the experimental screw compressor. The internal flow field of the twin-screw compressor is simulated by CFD software using the structured dynamic grid technology. The flow and thermodynamic parameters of the fluid inside the compressor are analyzed. The distribution of the internal pressure field, temperature field and velocity field of the compressor is obtained. Comparing the P-V indicator diagram and the macroscopic performance parameters of the compressor obtained by three-dimensional numerical simulation with the experimental results, it is found that the simulation results are basically consistent with the experimental data. The error is large at part load, and the maximum error is the adiabatic efficiency, which is 2.58%. Numerical simulation can accurately predict the performance of twin-screw compressor and provide a new method for compressor design.