Energy deposition in boundary gas layer during initiation of nanosecond sliding surface discharge

Kinetics of excited states and radicals in a nanosecond pulse discharge and afterglow in nitrogen and air

“…A short pulse duration also makes possible time-resolved studies of rapid energy transfer processes and reactions of excited electronic species and radicals in the afterglow. Over the last decade, there have been numerous studies of nanosecond pulse discharges operated in molecular gases, both theoretical [9][10][11][12][13] and experimental [14][15][16][17][18], to name just a few.…”

Nanosecond pulsed sliding dielectric barrier discharge plasma actuator for airflow control: Electrical, optical, and mechanical characteristics

“…[9][10][11] For such discharges, the main phenomenon responsible for manipulating the flow is not EHD force but a rapid variation of the surrounding gas temperature. [12][13][14] This abrupt change of temperature that occurs during the first nanoseconds of the discharges 15,16 induces a localized pressure wave that could interact with the natural boundary layer of the flow. 9,10,13 This pressure gradient is composed of a circular wave and a planar wave propagating at sound speed after a few microseconds 17,18 and supersonic velocity in its earlier stage of propagation (<5 ls), as reported in Ref.…”

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

“…The discharge section was a part of the low pressure chamber in a tube of 48 × 24 cm 2 cross section filled with air at room temperature and a pressure of p 0 = 20-80 Torr. 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.…”