Gas-dynamic phenomena accompanying shock-wave interactions with the cooling plasma of a pulsed surface discharge

The development of turbulence behind a shock wave front moving in an inhomogeneous region

“…Based on analysis of the dynamics of shock wave fields generated by the surface discharge, it was shown that a significant amount of the electric energy is converted into heat in a submillimeter near surface gas layer for a period of time shorter than 1 μs, which led in experiments to a fast heating up to 600⎯1000 K [6]. It was also found that, as the initial pressure in the discharge chamber was increased (>60-80 Torr), the plasma sheet glow became signifi cantly nonuniform in the flow direction, whereby sep arate bright channels were clearly manifested on a homogeneous background [5].A plane shock wave approached the beginning of the discharge gap in a preset time after termination of the discharge current pulse (the delay exceeded 40-50 μs). At this initial stage, intense relaxation pro cesses in discharge excited gas took place near the sur face, which were accompanied by cooling and expan sion of the heated region due to heat and mass transfer.…”

“…Based on analysis of the dynamics of shock wave fields generated by the surface discharge, it was shown that a significant amount of the electric energy is converted into heat in a submillimeter near surface gas layer for a period of time shorter than 1 μs, which led in experiments to a fast heating up to 600⎯1000 K [6]. It was also found that, as the initial pressure in the discharge chamber was increased (>60-80 Torr), the plasma sheet glow became signifi cantly nonuniform in the flow direction, whereby sep arate bright channels were clearly manifested on a homogeneous background [5].…”

“…In our previous experiments [4][5][6], sliding dis charges on a dielectric surface were obtained by apply ing a pulsed voltage of 25-30 kV amplitude to a 10 cm long 3 cm wide interelectrode gap located on the bottom of a discharge section. The discharge cur rent direction was perpendicular to the direction of gasdynamic flow in the tube.…”