Experimental analysis on the effects of DC arc discharges at various flow regimes

Abstract

This paper addresses the control of the boundary layer on a compression ramp by means of DC electrical arc discharges. The development and realization of the control system are first described and then assessed in the wind tunnel. The objective of the research was to control the supersonic flow using the minimum amount of energy. The array of electrodes was located at the base of a ramp, where a low momentum flow develops. The electrical discharge was generated by a custom designed electronic facility based on high-voltage ignition coils. The slanted tungsten electrodes were insulated by mounting them in a ceramic support. The discharge evolution was studied through high-speed flow visualizations, while electrical measurements at the high-voltage section of the circuitry allowed to estimate the energy release. The development of a high-speed short exposure Schlieren imaging technique, based on a very short duration laser pulse illumination and a double shot CCD camera, allowed to observe the macroscopic effects associated with the arc establishment between the electrodes (glow, sound wave and heat release). Due to the long residence time, the thermal perturbation spread along the streamwise direction. Cross correlation of Schlieren images with short time separation revealed that in supersonic conditions, the discharges led to an overall acceleration of the flow field underneath the oblique shock wave. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

Dynamics of near-surface electric discharges and mechanisms of their interaction with the airflow

“…Dynamics of DC and quasi-DC near-surface discharges have not been studied as extensively as that of SDBD discharges, since sustaining these discharges requires operating in a high-pressure, high-speed flow. The results obtained so far can be divided into low-pressure, high Mach number flow studies, when the plasma appears diffuse [17,[157][158][159][160], and high-pressure flows (P > 0.1 Bar), when the discharge transits into filamentary form [44, [161][162][163][164][165]. In both cases, the process of ion convection with the flow plays key role in plasma dynamics and in the spatial distribution of input energy release, as discussed in modeling studies [166][167][168].…”