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为了进一步揭示叶顶泄漏与压气机叶栅三维角区分离流动的相互作用机制,采用五孔气动探针测量了叶栅出口截面气动参数,并对机匣端壁静压进行了测量,详细分析了不同间隙尺寸及来流角度时压气机叶栅间隙流对角区三维分离流动的影响机理。研究结果表明,适当大小叶顶间隙引入的泄漏流阻止了端壁二次流动与叶片吸力面附面层之间的相互作用,移除了三维角区分离,改善了叶栅性能。随着叶顶间隙尺寸及叶栅内气流折转程度的增加,叶顶泄漏涡与上通道涡间的相互作用程度逐渐增强。
In order to further reveal the mechanism of the interaction between the tip leakage and the three-dimensional separation of flow in the compressor cascade, the aerodynamic parameters of the exit section of the cascade were measured by a five-hole pneumatic probe. The static pressure of the casing was measured and analyzed in detail The influence mechanism of the three-dimensional separation flow in the diagonal zone of the compressor cascade flow at different clearance size and flow angle is studied. The results show that the leakage flow introduced by the appropriate size of tip clearance prevents the interaction between the secondary flow in the end wall and the suction surface of the blade, and removes the separation of the three-dimensional corner and improves the performance of the blade. With the increase of the tip clearance size and the flow rate of airflow in the cascade, the interaction between the tip vortex vortex and the upper vortex vortex gradually increases.