J051055 遷音速遠心圧縮機羽根車の翼端漏れ渦崩壊が内部流れおよび空力性能に及ぼす影響([J05105]流体機械の研究開発におけるEFD/CFD(5))

概要

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Transonic centrifugal compressor impellers for automotive turbochargers operate from near surge limit to choke limit. In order to improve the performance, it is indispensable to understand complicated flow phenomena in impellers at off-design point. In this study, two types of transonic centrifugal compressor impellers with splitter blades, which are different in aerodynamic characteristics, have been investigated by DES(Detached Eddy Simulation). In comparison of total performance, the simulation results showed good agreement with the experimental ones. The simulation results revealed that the stall pattern was different between the two compressor impellers. In one of the two compressor impellers, vortex breakdown happens in the tip leakage vortex of full blade in all the passages, which expands the blockage near the tip and then suppresses the rotating stall. In the other compressor impeller, the rotating stall cell is formed at stall inception without the vortex breakdown in the tip leakage vortex of full blade, and grows with decreased flow rate.
一般社団法人日本機械学会の論文
2011-09-11