Suppression of reflected oblique shock wave by multi-filamentary plasma

Abstract

This paper describes the results of experimental study of stripwise near-surface plasma effect on oblique shock wave (SW) reflection from a solid wall in a M = 2 duct-driven shock-dominated airflow. Methods applied include schlieren visualization, plasma characterization with electric probes and optical emission spectroscopy, wall pressure measurements along the test section. The transient filamentary plasma is generated by means of a Quasi-DC electric discharge between flush mounted surface electrodes in a spanwise array. Test arrangement includes a shock wave (SW) generator installed on the bottom wall of the test section and the plasma generator installed on the upper wall. The SW generated from the bottom wall impinges the significantly disturbed boundary layer (BL) generated by the plasma array. The effect of reflected SW mitigation is demonstrated due to the interaction with the plasma-modified BL. The model of interaction is discussed and supported by the results of numerical simulation.