Experimental study of pulse corona discharge in aqueous electrolytes

Summary form only given, as follows. At some initial values of the electric field stress (E>3 MV/m) and the electrolyte conductivity (s>4 S/m) the ramified spray corona turns into a continuous plasma derivation. In this case, the level of hydrodynamic perturbations is the same, as it is at underwater spark discharges. By this way it is possible to shape in liquids a plasma piston of any configuration given beforehand and depending on the edge geometry. An important object for research is also the transition stratum between the plasma and liquid, in which basic processes of the water transformation into the corona plasma occurs. We carried out an experiment on determination of the plasma bunch shape at different parameters of the electric circuit, the electrolyte as well as the radius edge. Height speed photo registration of the plasma corona dynamics has shown that the plasma bunch iterates the form of the hemispherical edge at all selected options. The time integral spectrum of the corona plasma radiation was studied. On the background of the intensive continuum a wide absorption band appropriate to sodium resonance doublet is observed. It testifies that there is small enough boundary gases blanket between the plasma and electrolyte with temperature lower by the order then the plasma temperature. A shock-wave shadow diagram of a corona discharge is shown. Deviation of the diaphragm lattice shadows is observed on the background of a temporary plasma bunch time development. The bars deviate in three areas: a) in the field of the compression wave; b) in the area bound with the electrolyte heating; c) in the field of the transition stratum. Estimation of the energy allocated in the transition stratum during the discharge period allows stating that the role of the transition stratum during corona discharge conversion in electrolytes is essential.