关键词: 高负荷扩压叶栅；涡流发生器；二次流动；旋涡结构；角区分离

Abstract: Based on the flow characteristics of high load compressor cascade，the flow control scheme of using vortex generator applied in front of the end wall of cascade was proposed. Numerical simulations were carried out to explore the effects of vortex generator on performance of high load compressor cascade and the action mechanism of flow control. The alterations were analyzed on the cascade aerodynamic performance，the boundary layer and the principal vortices. The results show that the aerodynamic performance under the positive attack angle of cascade improves by means of vortex generators. Furthermore it decreases the total pressure loss，raises the static pressure ratio and increases the stable maximum positive incidence from 3° to 5°. In the incidence of 3°，the total pressure loss coefficient decreases 0.028 and the static pressure coefficient increases by 0.033. Vortex generator obstructs the migration of boundary layer at the end wall from pressure to suction side，which makes the low energy fluid accumulated in the suction surface and the end wall region decreases，and then improves corner flow. After using the vortex generator，the development of the passage vortex，concentrated shed vortex and corner vortex is most effectively controlled，and then the corner stall is restrained.

Key words: High-load compressor cascade；Vortex generator; Secondary flow；Vortex structure；Corner stall