吸附式扩压叶栅流动仿真与试验研究

Fluid simulation and experimental research on suction-type diffuser cascade

利用附面层抽吸技术,对大弯角平面扩压叶栅端壁流场进行试验研究,通过叶栅吸力面开槽抽吸的方式,研究不同吸气位置、吸气量对叶栅气动性能的影响,结合平面叶栅流动试验和数值仿真结果,分析叶栅抽吸和不抽吸的分离线形态及流场结构,探索叶栅附面层流动机理和端壁流动对叶栅气动性能的影响。结果表明:控制附面层流动的吸出技术是改善压气机叶栅性能的关键手段之一,对于高亚音速叶栅采用吸力面附面层吸出技术,可以提高叶栅气动性能。

By using the boundary layer suction technique, the end wall flow field of largely bent plane diffuser cascade was studied. By the way of imposing suction at the groove on the cascade suction surface, the impact of different suction intensities on the aerodynamic performance of the cascade was tested. Based on the results of flow test and numerical simulation of the plane cascade, analysis on the separation line shape and flow field structure of the cascade suction and non-suction has been carried out, to explore the impact of cascade boundary layer flow mechanism and end wall flow on the aerodynamic performance of the cascade. The results show that the suction technology of controlling the boundary layer flow is one of the key means to improve the performance of compressor cascade. For high subsonic cascades, its aerodynamic performance can be improved by applying the boundary layer suction technique on the suction surface.