Simulation of the Seat Form of Negative Corona Discharge in a Point-plane Electrodes System

CZU 537.523.3, 537.523.9

Negative corona discharge in a point-plane electrode system is simulated. Equations for transfer of electrons and ions are given as drift-diffusion approximation. A "mushroom"-like seat of the corona sheath is developed. A mechanism of this seat form is determined: near the sheath the bipolar charge structure of positive ions and electrons dominates and causes contraction of electric field lines; in the external zone ions of the negative charge dominate, which causes divergence of electric field lines. Distortion of the lines of force leads to the formation of the “mushroom” glow of the corona discharge.

Keywords: corona discharge, air, drift-diffusion approximation, simulation.