中文摘要：

基于压气机在大负荷下发生气流分离的流动特征提出了一种无源引气微脉冲射流控制的概念,并对其核心的脉冲射流器进行了特性实验分析,结果表明脉冲射流器能产生明显的脉冲射流且射流频率无级可调。结合无源脉冲射流控制方式建立了一套仿叶栅通道实验模型,得到了无流动控制时通道内稳态及动态压力特性,在设计状态下通道内分离涡主频为266Hz。对该分离流场进行了脉冲射流控制通道内气流分离的实验研究,实验测量了频率从60Hz到600Hz的微脉冲射流对分离流的控制效果。实验结果表明：从通道总压损失减小的效果来看,当脉冲射流频率接近分离涡主频时控制效果最为明显。此时通道内占主导地位的分离涡的周期性特性得到了明显的改善,其他频率的旋涡对流场的影响程度在脉冲射流的作用下被削弱,流场结构较无控、定常射流控制及其他脉冲射流频率状态更为有序。

英文摘要：

Based on the flow separation characteristics in a compressor,a micro pulsed aspirated jet concept is presented and experiments are conducted on them,which shows that an obvious pulsed jet can be generated and the jet frequency can be continuously adjusted.Combined with this new unsteady control method,an imitating cascade channel is established.The steady and dynamic pressure characteristics in the no control state are obtained,and the characteristic frequency of the separated vortex is found to be about 266 Hz.Finally,the experiment of controlling separation flow by pulsed jet is performed,and the frequency of the pulsed jet lies between 60-600 Hz.Results show that when the frequency of the pulsed jet is close to the characteristic frequency of the separated vortex,the control effect is more obvious.Meanwhile,the periodic characteristics of the dominant vortex are significantly improved,while the influence of other vortices on the flow field is weakened.The flow structure is more orderly in comparison to no control,steady control and other frequency pulsed control states.