Numerical analysis of the transient flow in a scroll refrigeration compressor

10th International Conference on Compressors and their Systems

Sun, Shuaihui^1,2 ; Wu, Kai^1 ; Guo, Pengcheng^1 ; Luo, Xingqi^1

State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi'An University of Technology, Xi'an, Shaanxi

710048, China^1

State Key Laboratory of Compressor Technology, Hefei, Anhui

230031, China^2

关键词: CFD technologies;    Compression chambers;    Gradient of temperature;    Meshing clearance;    Refrigeration compressors;    Structural grids;    Velocity vector distribution;    Working chambers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/232/1/012050/pdf
DOI  :  10.1088/1757-899X/232/1/012050

来源: IOP

【 摘 要 】

In the present paper, the CFD technology is adopted to simulate the working process of a scroll refrigeration compressor with R22 as working fluid. The structural grids in the scroll compressor were updated continually during the solving process to cope with the movement boundaries of the fluid domain. The radial meshing clearance was 0.008 mm which was the same with that in the real prototype. The pressure, velocity and temperature distribution in chambers of compressor were computed. Also, the transient mass flux diagrams were calculated out. The results indicated that the pressure was asymmetrical in the two symmetrical suction chambers, because the suction port and passage were not absolutely symmetrical. The gradient of temperature was great in each working chamber due to leakage flow. Velocity vector distribution was asymmetrical in each pair of working chamber owing to the movement of orbiting scroll; the flow was complicated in the central working chamber. The movement of the orbiting scroll had different influence on the vortexes formation in each pair of compression chamber. The inlet and outlet mass flux fluctuated with the crank angle obviously. Because of the 'cut-off' of the refrigeration fluid in the suction chamber when the crank angle was larger than 220°, the inlet mass flux decreased remarkably. Finally, some useful advices were given to improve the performance of the scroll refrigeration compressor.