中国物理B ›› 2019, Vol. 28 ›› Issue (2): 24701-024701.doi: 10.1088/1674-1056/28/2/024701
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Zhen Yang(杨臻), Hui-Min Song(宋慧敏), Hong-Yu Wang(王宏宇), Shan-Guang Guo(郭善广), Min Jia(贾敏), Kang Wang(王康)
Zhen Yang(杨臻), Hui-Min Song(宋慧敏), Hong-Yu Wang(王宏宇), Shan-Guang Guo(郭善广), Min Jia(贾敏), Kang Wang(王康)
摘要: In this paper, aerodynamic actuation characteristics of radio-frequency (RF) discharge plasma are studied and a method is proposed for shock wave control based on RF discharge. Under the static condition, a RF diffuse glow discharge can be observed; under the supersonic inflow, the plasma is blown downstream but remains continuous and stable. Time-resolved schlieren is used for flow field visualization. It is found that RF discharge not only leads to continuous energy deposition on the electrode surface but also induces a compression wave. Under the supersonic inflow condition, a weak oblique shock wave is induced by discharge. Experimental results of the shock wave control indicate that the applied actuation can disperse the bottom structure of the ramp-induced oblique shock wave, which is also observed in the extracted shock wave structure after image processing. More importantly, this control effect can be maintained steadily due to the continuous high-frequency (MHz) discharge. Finally, correlations for schlieren images and numerical simulations are employed to further explore the flow control mechanism. It is observed that the vortex in the boundary layer increases after the application of actuation, meaning that the boundary layer in the downstream of the actuation position is thickened. This is equivalent to covering a layer of low-density smooth wall around the compression corner and on the ramp surface, thereby weakening the compressibility at the compression corner. Our results demonstrate the ability of RF plasma aerodynamic actuation to control the supersonic airflow.
中图分类号: (Compressible flows; shock waves)