双孔VGJs对高亚音扩压叶栅端区流动的影响

Effect of Double VGJs on End-wall Flow in High Subsonic Cascade

本文采用数值模拟的方法研究了单孔以及双孔射流旋涡发生器(VGJs)对高亚音速(Ma=0.67)压气机叶栅内气动性能的影响,同时对双孔射流参数对控制效果的影响进行了分析,并对控制前后栅内流场以及主要旋涡结构的变化进行了详细的探讨。计算结果表明:采用单孔以及同向双孔射流均有效的降低了总压损失系数,增强了气流折转能力,有效的改善了端区流动。相对距离对VGJs的控制效果影响较小,但对倾角的变化较为敏感。单双孔射流的控制机制基本一致,采用射流旋涡发生器后,端壁附面层横向迁移被有效的抑制,通道涡、集中脱落涡,壁面涡以及壁角涡被削弱,同时在吸力面侧形成诱导涡,附面层分离被推迟。

This paper presents a numerical investigation to explore the control effect of single and double Vortex Generator jets in a high subsonic compressor cascade, the influence of jet parameters are also considered. The flow fields and the main vortex structure changes in the cascade are also analyzed in detail. The simulation results show that, both single Jet and co-rotating jets have a good effect in reducing total pressure loss and increasing the ability of flow turning. The control effect of relative distance is small, but is more sensitive to the change of pitch and skew angle. The control mechanisms of single and double jets are basically identical, after using the VGJs, it is shown that end-wall cross flow is effectively controlled. Passage vortex, concentrated shedding vortex, wall vortex and wall corner vortex is weakened, the induced vortex is formed near the suction surface at the same time, the boundary layer separation was also delayed.