Pulsed volume discharge with preionization in two-dimensional gasdynamic flow

A Nanosecond High-Current Discharge in a Supersonic Gas Flow

“…Under the conditions being treated, the average value of specific energy deposition was 0.03-0.06 eV/mol [10]. In so doing, approximately 12% of total energy is released in the plasma sheets formed by a creeping surface discharge.…”

“…For the dimensions of the electrodes of the discharge system being investigated of L 0 = 4.8 cm, L 1 = 10 cm ( [10], and pressures P ≥ 20 torr, the characteristic frequencies of diffusion processes for charged particles are [19] (D a is the ambipolar diffusion coefficient), which is much less than the inverse time of discharge pulse and characteristic frequencies of reactions of electron-ion recombination. Therefore, the spatial (in the direction transverse to the electric field vector) dynamics of charged particles under the conditions being treated are insignificant and, in the case of uniform initial distribution of gas density, the problem of simulation of discharge may be treated in zero-dimensional approximation.…”

“…1) including a shock tube with a cross section of 48×24 mm 2 joined to a discharge section of the same cross section [10]. Helium was used as the "pusher" gas.…”

“…Also discussed in the above-cited and in a number of other papers was the mechanism of the effect of discharge on gasdynamic flow. At present, one can apparently regard as proved [8][9][10][11] the statement that the main variation of the flow characteristics is associated with the thermal impact of electric discharge. Special note is made of the significant effect of the spatial structure of the zone of energy release on the parameters of flow [8,9]; this, in turn, defines higher interest in the investigation of discharges with spatially nonuniform distribution of parameters [7,12,13] and, in particular, of contracted discharges [4,8,14].…”

Self-Localization of the Energy Supply During Pulse Ionization of a Supersonic Flow

“…In order to simulate experimentally the pulsed spatial energy supply to part of a gas channel flow it was proposed to use a pulse volume discharge with preliminary ionization by ultraviolet radiation induced by plasma sheets [8][9][10][11]. As distinct from the simulation of a single pulse of finite duration [2], the realization of such a discharge behind a plane shock wave in a shock-tube channel can be regarded as instantaneous spatial energy supply to part of the gasdynamic flow.…”