关键词: 压气机叶栅;涡流发生器;横向二次流;角区分离;流向涡

Abstract: In order to study the passive vortex generator to suppress the crosswise secondary flow of the compressor cascade to control the separation of the corner zone, a control scheme for installing the vortex generator at the inner end wall of the cascade is designed. With the method of numerical simulation, the cascade flow field characteristics are analyzed in detail. The results show that VG can suppress the crosswise secondary flow effectively, which results in the improvement of corner region flow. In the optimum control scheme, the total pressure loss coefficient decreases by 8.1%. The VG placed inside of cascade can resist the crosswise flow and the streamwise vortex generated by VG can interact with the boundary layer in near end wall region, resulting in limiting the development of passage vortex from pressure to suction side. Meanwhile stream-wise vortex entrains high energy fluid to suction side corner region to increase momentum of corner fluid. Furthermore, the intensity of streamwise vortex are influenced by both length and height of VG, and the height of streamwise vortex core is same as the height of VG. Thus, the final control effect is decided by both length and height of VG. Only when they are chosen reasonably, the optimal effect can be achieved.

Key words: Compressor cascade;Vortex generator;Crosswise secondary flow;Corner separation;Streamwise vortex