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为了研究端壁射流旋涡对扩压叶栅分离流动及性能的影响,采用数值模拟的方法,对不同攻角下带有端壁射流的50°折转角扩压叶栅进行了研究。结果表明:具有最优射流结构的旋涡发生器有效减弱了叶栅角区分离,零攻角下出口总压损失降低了8.9%;随着攻角的上升,射流对扩压叶栅气动性能的改善越显著;射流产生的旋涡可阻挡端壁低能流体向吸力面的迁移,并将主流流体卷入角区,角区流体动量增加、流动分离减弱,但旋涡与端壁二次流的掺混使得10%叶高以下的损失略微增大;射流参数决定了射流旋涡与吸力面的相对位置以及旋涡强度,对射流控制栅内流动分离效果有重大影响,需合理选择。
In order to study the influence of the eddy of end jet on the separation flow and performance of diffuser cascade, numerical simulation is used to study the 50 ° turning angle diffuser with end jet at different angles of attack. The results show that the vortex generator with the optimal jet structure can effectively reduce the separation of the cascades. The total pressure drop at the zero-angle of attack decreases by 8.9%. As the angle of attack increases, The vortex generated by the jet can block the migration of the low-energy fluid on the end wall to the suction surface, and the main fluid is entangled in the corner zone. The fluid momentum increases and the flow separation decreases in the corner zone. However, So the loss under 10% leaf height slightly increases. The jet parameters determine the relative position of vortex and suction surface of jet and the vortex intensity, which have a significant impact on the flow separation effect in the jet control grid.