Because the volume of the variable base circular involute scroll compressor can be reduced under the premise of obtaining the same cooling capacity

it can meet the small and lightweight requirements of the vehicle air conditioning compressor. In order to improve the isentropic efficiency and volumetric efficiency of the scroll compressor

a mathematical and geometric model of the scroll disc with variable base circular involute is established. With the variable index k and the modified increment δ0 as variables

the internal flow field of the scroll compressor is numerically simulated and hydrodynamic analysis is carried out. The numerical results show that when the parameters of the variable base circular line are k=1 and δ0 =-0.03

the specific dissipation rate of the fluid in the compressor working chamber is 180.28 s-1

which is 103.11 s-1 lower than that of 283.39 s-1 of the flow field in the fixed base circular compressor. The isentropic efficiency of scroll compressor can be improved by reducing the energy loss caused by turbulent kinetic energy dissipation. The performance test of electric vehicle air conditioning scroll compressor is carried out. Compared with fixed base scroll compressor

the input power of variable base scroll compressor with k=1 and δ0 =-0.03 decreases by 1.392%

and the performance coefficient COPel increases by 4.204%.