The influences of pressure-side winglet on aerodynamic performance of compressor cascade at different incidences

A numerical simulation has been carried out to investigate the influences of pressure-side winglet on controlling tip clearance flow in an axial compressor cascade. Emphasis is put on the analysis of effectiveness of pressure-side winglet when the approaching flow is at different incidences (-5°, 0°, +3°). The simulation results show that with the increase of incidence, the region under the effect of pressure difference extends towards the blade leading edge, and the position of leakage vortex generation moves progressively upstream; Moreover, with pressure-side winglet, at all these incidences, the blade loading near the tip are increased, thus the strength of tip leakage flow is intensified, and the aerodynamic performance of the cascade is deteriorated.