Numerical Investigation on Secondary Flow Control in Cascade with Micro-Vortex Generator

The performance of compressor cascade is considerably influenced by secondary flow. The present study was carried out on a high-loaded axial compressor cascade with incoming flow of Ma<0.1 to investigate the effects of Micro-vortex generator (MVG) used in low-Mach number cascade on secondary flow. The study analyzed the loss of design and stall incidence angle with numerical method and compared the different combinations of MVG referring to stall indicator. Results show that most cases can restrain the region of separation in -1° incidence angle, but all of them cause the increase of loss. In 8° incidence angle, all cases can delay separation region and decrease loss. The case VG_dvg3 shows the highest loss reduction benefit of 6.3%, and the stall coefficient is decreased by 46%, which indicates that MVG can control the large separation area effectively. The loss of 0% ~ 30% span is mainly controlled by MVG, and there is an optimal range of vane's distance and installation position, too far or close is unsuitable.