端壁VGJs对高亚音扩压叶栅内分离结构的影响

To reveal the internal flow characteristics of a compressor cascade before and after separation control by internal vortex generator jets (VJTs), the change in the separate configuration of a high subsonic compressor cascade before and after the control was analyzed in detail according to a topology theory, and the topological and vortex structure models were given. Moreover, loss characteristics were also considered. The calculation results show that the end-wall jet vortex generator changed the separate configuration of the flow fields, which effectively delayed the suction surface flow separation. After using flow control, the number of odd-points was significantly reduced, and the end-wall cross flow was effectively controlled. Furthermore, the passage vortex and concentrated shedding vortex were weakened, and the trailing edge shedding vortex at mid-span basically disappeared. The end-wall boundary layer loss and profile loss were not obvious, while the secondary flow loss is up to 38%. The end-wall VGJs have a weak influence on the middle of the cascade. Therefore, it is necessary to adopt a combined flow control to further improve the flow field structure.