关键词: 压气机叶栅;冲角;吸力面小翼;间隙流动;数值仿真

Abstract: In order to further uncover the effects and action mechanics of the suction-side winglet on the tip leakage flow of the compressor cascade,the numerical simulation has been carried out to investigate the effects of suction-side winglet on controlling tip clearance flow in an axial compressor cascade.Emphasis is put on the analysis of effectiveness of suction-side winglet when the approaching flow is at different incidences(-5°,0°,+3°). The simulation results show that, at negative incidence,the suction-side winglet can reduce the cascade aerodynamic loss significantly and the boundary separation on pressure surface can be effectively controlled by using suction-side winglet.With the increase of incidence,the region under the effect of pressure difference extends towards the blade leading edge,and the interaction between leakage vortices and passage vortex is intensified.The improvement of suction-side winglet on the aerodynamic performance decreases gradually.

Key words: Compressor cascade;Incidence;Suction-side winglet; Tip leakage flow;Numerical simulation