高亚声速下附面层抽吸控制压气机叶栅流动分离的研究

Flow Separation of Compressor Cascade Controlled by Boundary Layer Suction at High Subsonic Velocity

关键词:  高负荷叶栅  附面层抽吸  高亚声速  流动分离  压气机叶栅

Key words:  High load cascade  Boundary layer suction  High subsonic  Flow separation  Compressor cascade

摘要:

为研究高亚声速下附面层抽吸参数对流动分离控制的效果和机理，以高负荷扩压叶栅为研究对象，通过数值方法研究了抽吸布局和抽吸流量对叶栅内部流动分离控制效果的影响。结果表明，附面层抽吸能够显著改善叶栅内部流动，降低因附面层分离和端区角区分离、相互掺混造成的流动损失；高亚声速下附面层抽吸的最佳位置在附面层充分发展区域而非分离起始点附近；1.32%抽吸流量下，在叶片吸力面距离尾缘34%弦长处进行附面层抽吸的效果最佳，叶栅总损失降低54.03%；各抽吸槽因抽吸强度的降低使组合抽吸对于进一步改善流动效果并不明显；抽吸流量与抽吸效果呈正相关的关系，但是高亚声速下通过附面层抽吸无法完全消除高负荷叶栅内部角区分离。

Abstract:

In order to study the effects and mechanism of the suction parameters on the flow separation control at high subsonic velocity，the high-load compressor cascade is taken as the research object，the effects of suction layout and suction rate on the control effect of flow separation inside the cascade are studied by numerical simulation. The results show that the suction of the boundary layer can significantly improve the internal flow of the cascade，and reduce the flow loss caused by the separation of the boundary layer and the separation of the endwall corners and mutal mixing. The best location for the suction of the boundary layer at high subsonic velocity is near the fully developed area of the boundary layer rather than the starting point of separation. With the 1.32% suction rate，the boundary layer suction of the blade from the trail edge of 34% chord length of the suction surface can achieve the best effect，and the total loss of the cascade is reduced by 54.03%. The combined suction has no obvious effect for further improving flow separation due to the reduction of suction intensity of each suction slot. There is a positive correlation between the suction rate and the suction effect，but the boundary layer suction at high subsonic velocity cannot completely eliminate the corner separation of the high load cascade.