A streamwise array of pulsed spark discharge operating at a high frequency of 10 kHz is used to control the shock wave/boundary layer interaction (SWBLI) induced by a 24° compression ramp (CR) in a Mach 2.0 flow. High-speed schlieren imaging at 50 000 frames/s is deployed for flow visualization. The schlieren snapshots, as well as statistics of the schlieren sequence, show that the intensity weakening effect on the shock wave can be achieved for a long time up to 20 ms, which is the first experimental demonstration of stable control on the CR-SWBLI with plasma actuators. Then, based on fast Fourier transform analyses, the low-frequency unsteadiness of the shock wave is also significantly modified and the dominant oscillation frequency is switched to the high frequency St = 0.32. The mechanism of the encouraging control outcome is finally discussed that the strong separation wave induced by a CR is replaced by a multistage weak compression wave produced through a high-frequency actuator array.

中文翻译：

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高频射流脉冲火花放电阵列的压缩斜波冲击波/边界层相互作用控制

以10 kHz的高频运行的脉冲火花放电的流式阵列用于控制在2.0马赫数流中由24°压缩坡道（CR）引起的冲击波/边界层相互作用（SWBLI）。部署了以50000帧/秒的高速schlieren成像技术来进行流动可视化。schlieren快照以及schlieren序列的统计数据表明，可以在长达20 ms的时间内实现对冲击波的强度减弱作用，这是对CR-SWBLI进行稳定控制的第一个实验证明。等离子致动器。然后，基于快速傅里叶变换分析，冲击波的低频不稳定性也得到了显着修正，主振荡频率切换为高频St= 0.32。最后讨论了令人鼓舞的控制结果的机制，即通过高频致动器阵列产生的多级弱压缩波代替了CR引起的强分离波。