Influence mechanism of different tip curvatures on the performance of tip-leaned centrifugal impellers
Confronted with the rising demand for enhanced performance in modern engine centrifugal impellers,tip-leaned centrifugal impellers have shown the ability to effectively improve aerodynamic efficiency.This paper utilizes numerical simulations to predict the performance of compressors with varying curvature directions,types,and de-grees.Based on these simulations,the flow field within the compressor under different flow conditions is analyzed to understand the performance changes in blade tip-leaned compressors.The results indicate that a negative leaned im-peller increases both the peak efficiency and choke flow rate of the compressor.On the contrary,a positive leaned impeller enhances the stall margin,though it sacrifices some efficiency.In tip-leaned impellers,the static pressure distribution within the blade passage is optimized by improving the load at the leading edge of the blade tip.This ad-justment weakens shock wave intensity,reduces secondary flow losses,and inhibits the development of low-energy vortices.These findings provide valuable insights for the modification design of centrifugal compressor blades.
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