| Citation: | Yu Liang, Peng Wenqiang, Zhu Yinxin, et al. Study on control of severe corner separation in large-turning-angle diffuser cascades based on end-wall synthetic jets[J]. Journal of Aerospace Power, 2026, 41（X）：20250586 doi: 10.13224/j.cnki.jasp.20250586
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To mitigate severe corner separation in large-turning-angle diffuser cascades, this study systematically investigated the control effects of endwall synthetic jets on a cascade with a geometric turning angle of 68°. The jets were arranged at four distinct positions: the leading edge, mid-section (encompassing the locations anterior and posterior to the separation reattachment point), and trailing edge of corner separation. By coupling three core control parameters—jet angle, momentum coefficient, and excitation frequency, this study elucidated the modulation mechanisms of synthetic jets on the endwall boundary layer, separation bubble, and complex secondary flow structures. The results indicated that end-wall synthetic jets can effectively weaken corner separation. Specifically, the end-wall synthetic jet arranged at the middle region of the separation (before the reattachment point) with a jet angle of 30° can effectively act on the core area of the separation bubble, break up the corner separation vortex, and block the boundary layer migration. This configuration achieved a maximum reduction of 20.27% in total pressure loss coefficient and an increase of 13.07% in static pressure rise coefficient. In contrast, the end-wall synthetic jet placed at the leading edge of the separation with the same jet angle of 30° inhibited the separation expansion from the source, resulting in a 14.69% reduction in total pressure loss coefficient and a 9.66% increase in static pressure rise coefficient. However, the end-wall synthetic jets arranged at the middle region of the separation (after the reattachment point) and the trailing edge exhibited limited control effects. The study proposed a control strategy covering the entire evolution stage of corner separation, and revealed the adaptation mechanism between synthetic jets and separation stages, offering an approach to optimize the aerodynamic performance of large-turning-angle diffuser cascades.
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