Experimental study on shock‐shock interaction over double wedge controlled by surface arc plasma array

The Mach 8 hypersonic shock-shock interaction (SSI) over a double wedge controlled by the improved high-energy surface arc discharge array (H-SADA) have been investigated with high-speed schlieren imaging. The H-SADA with 10 actuators is installed on the first wedge to deposit energy into the hypersonic flow. In the hypersonic double wedge flow, the arrays of blast wave and thermal bubble induced by H-SADA successively develop into a bump virtual profile and a wedge virtual profile, and the former makes complex SSI structure evolve into a bow shock, the latter makes it evolve into an oblique shock. Under the control of single discharge pulse, the disappearance process and the reconstruction process of SSI structure occur successively, and the whole process lasts for 0.2 ms. The H-SADA works stably at frequency of 500 Hz in hypersonic flow, and there is little difference in the control process of each pulse, which means that the SSI structure disappears for 0.2 ms every 2 ms.