附面层抽吸对带有叶顶间隙扩压叶栅涡量场影响

针对带有叶顶间隙的大转角扩压叶栅,采用实验校核的CFD方法分别研究了叶顶开槽、吸力面端部开槽及叶顶-吸力面端部组合开槽抽吸对涡量场的影响,结合涡动力学理论分析附面层抽吸机制。结果表明涡量是流场中自由涡的根源,其峰值区域严重堵塞流场,叶顶抽吸通过吸除径向潜流附面层控制泄漏流轴向涡量分布,降低了泄漏损失,而吸力面开槽消除了角区复杂分离结构,通过二者的组合,将涡量吸附至近壁面处,流场中损失模式趋于简单化。

Effects of Boundary Layer Suction on Vorticity of Compressor Cascades with Tip Clearance

The numerical simulation that was verified by an experiment was conducted to study the high-turning compressor cascade with tip clearance. The effects of the boundary layer suction on its vortexes was respectively explored where suction slot is separated located in tip, suction side end and tip-suction side end combination. And the control mechanism was explained from the perspective of vortex dynamics theory. Results show that the vorticity was the source of free vortex and the flow fields were blocked by the area of vorticity. The axial vorticity distribution of leakage flow was controlled because of the boundary layer was removed in tip while the loss decreased. Boundary layer suction in suction side diminished the complex corner separation. The area of high vorticity was moved to wall through the combination of both of them, and the loss model tends to simple.