端壁射流式旋涡发生器在跨声速扩压叶栅内的作用机理研究

The technology of vortex generator jet (VGJ) has exhibited tremendous potential in controlling flow separations in compressor cascades. However, in the current researches, this control technology is mainly applied in subsonic compressor cascade, and hence the applications in transonic compressor cascade should be carried out. In addition, the researches about the mechanisms of endwall pulsed jets are rare, and the relative study is in urgent need to carry out. In this project, the mechanisms of endwall steady jets and pulsed ones applied in transonic compressor cascades will be studied by installing the jet tubes into the endwall. The research will be conducted by numerical calculations and experiments, and the influences on jet control effects caused by the changes of jet locations, jet angles and jet velocities will be discussed in detail. For steady jets, it is mainly discussed that the effects on the shockwave and flow separations in the cascades caused by momentum injection and streamwise vortex; For pulsed jets, it is mainly revealed that the transportation and attenuation of jet control signals in the cascade flow passage and analyze the response characteristic of the flow separations to control signals. The different evolvement mechanisms of flow separations in cascades caused by the two kinds of control methods will be revealed. This research aims at providing technical support to the practical application of endwall vortex generator jet in transonic compressor.

射流式旋涡发生器（VGJ）在扩压叶栅分离流动控制中表现出了巨大的应用潜力，但在现有的研究中，主要是将该技术应用于亚声速扩压叶栅，关于其在跨声速叶栅内的应用需仔细研究，此外，端壁脉冲射流作用机理的相关研究目前也较为罕见，亟需深入探讨及完善。本项目拟通过在叶栅端壁处放置射流管，探索端壁稳态射流及脉冲射流在跨声速压气机叶栅流场内的作用机理。具体将以数值和实验的手段开展研究，讨论射流位置、射流角度以及射流速度的变化对于其控制效果的影响。针对稳态射流，主要探讨动量注入以及射流旋涡在叶栅流场内对于激波及其诱导附面层分离的影响；针对脉冲射流，则主要揭示射流控制信号在叶栅流道内部的输运及衰减规律，阐明分离流动对控制信号的响应特性，旨在明晰两种控制方式下叶栅流场内由于激波所诱导的流动分离结构的不同演变机制。通过本项目研究，以期为端壁射流在跨声速压气机内的工程应用提供一定程度的技术支撑。

本项目通过在叶栅端壁处放置射流管，探索了端壁稳态射流及脉冲射流在跨声速压气机叶栅流场内的作用机理。具体是以数值和实验的手段开展了研究，讨论了射流位置、射流角度以及射流速度的变化对于其控制效果的影响。针对稳态射流，主要探讨了射流旋涡以及动量注入在叶栅流场内对于流动分离的影响；针对脉冲射流，则主要揭示了射流控制信号在叶栅流道内部的输运及衰减规律，阐明了分离流动对控制信号的响应特性，揭示了两种控制方式下叶栅流场内由于激波所诱导的流动分离结构的不同演变机制。通过本项目的研究，为端壁射流在跨声速压气机内的工程应用提供了 一定程度的技术支撑。