电驱动离心压气机叶型分析及设计

In this paper, the performance requirements and design characteristics of the electric-compressor were analyzed to conceive a conceptual design for the blade of electric-compressor, running with low specific speed and high efficiency. The performance of the centrifugal compressor impeller J90 used in the ordinary vehicle turbocharger and the compressor impeller JE90 used in the low specific speed were analyzed respectively. Comparing and analyzing the differences in the meridional channel, blade angle distribution and blade load distribution of the two impellers in different applications, the design geometry rule and strategy of the electric-compressor impeller were obtained. The research results show that, optimizing the shape of the meridional channel can improve the flow and reduce the secondary flow loss, the split blade with back-swept can increase the stall margin and the operation margin, choosing a smaller exit blade angle for distribution can improve pressure gap between the suction surface and the pressure surface to enhance the function for the air, the maximum of the main blade thickness should not be too large and the thickness distribution in the middle span should be uniform.