高反動度化と負荷分布の最適化による遠心圧縮機の段性能向上

概要

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Performance improvement of 3D impellers in a high specific speed range was investigated using computational fluid dynamics (CFD) analyses and experimental tests. Four types of fully-shrouded impellers were designed, manufactured and tested to evaluate the effects of blade loading, backsweep angle and relative velocity diffusion ratio on compressor performance. The design suction flow coefficient was 0.125 and the machine Mach number was 0.87. Test results showed that high degree of reaction stage (large inlet-to-exit relative velocity diffusion ratio and large backsweep angle) achieved 3.8% higher stage efficiency and larger surge margin without reducing the pressure coefficient and choke margin. It was concluded that high reaction stage coupled with an aft blade loading distribution was a very effective way to improve stage efficiency and surge margin.
2010-09-20