Aerodynamic actuation characteristics of radio-frequency discharge plasma and control of supersonic flow

doi:10.1088/1674-1056/28/2/024701

Abstract 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.

Keywords: radio-frequency (RF) discharge plasma surface discharge flow control aerodynamic actuation

Received: 02 September 2018
Revised: 10 October 2018
Accepted manuscript online:

PACS:	47.40.-x	(Compressible flows; shock waves)
	47.40.Ki	(Supersonic and hypersonic flows)
	52.70.Gw	(Radio-frequency and microwave measurements)
	52.80.Pi	(High-frequency and RF discharges)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11472306, 51407197, and 51507187).

Corresponding Authors: Hui-Min Song
E-mail: min_cargi@sina.com

Cite this article:

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) Aerodynamic actuation characteristics of radio-frequency discharge plasma and control of supersonic flow 2019 Chin. Phys. B 28 024701

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Aerodynamic actuation characteristics of radio-frequency discharge plasma and control of supersonic flow

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