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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。
Based on the flow characteristics of the compressor when the airflow separates under heavy load, a concept of passive induced gas pulse pulse jet control is proposed. The characteristics of the pulse jet injector are analyzed experimentally. The results show that the pulse jet can produce obvious Pulse jet and jet frequency stepless adjustable. In this paper, a simulation model of imitation cascade channel was established based on passive pulse jet control. The steady-state and dynamic pressure characteristics of the channel were obtained under no-flow control. Under the designed condition, the dominant frequency of the separated vortex was 266 Hz. The separation flow field was experimentally studied on the air separation in the pulse jet control channel. The experimental results show that the micro-pulse jet with the frequency from 60Hz to 600Hz can control the separation flow effectively. The experimental results show that the control effect is most obvious when the pulse jet frequency is close to the dominant frequency of the separation vortex in terms of the effect of reducing the total pressure loss of the channel. In this case, the periodic characteristics of the dominant vortex in the channel have been significantly improved. The influence of the vortex at other frequencies on the flow field is weakened by the pulsed jet. The structure of the flow field is more uncontrolled. The steady jet control and Other pulse jet frequency state more orderly.