Control of Shock Positions in a Supersonic Duct by Plasma Array

Triggering Shock Wave Positions by Patterned Energy Deposition

“…By analyzing cross-flow pressure distributions for single and triple plasma filament configurations as well as observing carbon dioxide Mie scattering, the predicted effect is now experimentally demonstrated at M = 4. For various conditions [12][13][14]23], including supersonic flows with M = 2 and M = 4, filamentary plasma authority has been well demonstrated. This essentially thermal interaction mechanism is illustrated in Figure 11: with a high local gas temperature, the multifilamentary plasma zone presents an array of longitudinal subsonic jets enclosed in a supersonic flow.…”

“…It creates a new SW, similar to solid obstacles, but much faster than any mechanical element. In an advanced approach [12][13][14], a spatial modulation of gas temperature is credited with redistributing pressure in the flowfield. High gas temperatures result in higher sonic velocity in the plasma zone, resulting in faster propagation of pressure disturbances or even the appearance of subsonic channels within supersonic flows.…”

“…It has been described numerous times in the literature that a stationary or transient SW appears at the generation of electrical and laser discharges in supersonic flows [12,[19][20][21]. The effects of near-surface filamentary plasmas on SWs position at plane wall and at compression surface arrangements were discussed in several serial works [14,[22][23][24][25][26]. It was found that a near-surface stratified gas layer, consisting of lengthwise zones of supersonic and subsonic flow, modifies the SWBLI pattern when impinged by an external SW.…”

“…It was found that a near-surface stratified gas layer, consisting of lengthwise zones of supersonic and subsonic flow, modifies the SWBLI pattern when impinged by an external SW. The plasma method of SW triggering has been explored in recent publications [14,27,28] where schlieren visualization, pressure sensitive paint methods, and pressure sensing are used to demonstrate fast response with high actuation authority. However, for the SW pattern visualization, a three-dimensional technique is required for the detailed inside.…”