Simulation of a Positive dc Corona Discharge in a Needle-Plane Electrode Configuration

Two-dimensional axisymmetric model has been developed for the simulation of a dc positive corona discharge in a needle-plane configuration at atmospheric pressure using COMSOL Multiphysics. The continuity equations for electrons, positive and negative ions, including the effects of ionization, attachment, recombination, electron diffusion and photoionization, have been solved simultaneously with Poisson's equation. The spatial-temporal variations of the electric field, the electrons, positive and negative ions have been investigated.