Numerical modeling of negative-corona discharge in oxygen under different pressures

This paper presents a numerical model of the negative-corona discharge in oxygen under different pressures at room temperature. The model assumes the presence of two charged species: electrons and ions. The boundary element and finite-element methods have been used to calculate the electric field and the method of characteristics has been employed for the densities of electrons and ions. The simulation has been performed for an axisymmetrical point-plane geometry with a hyperboloidal needle perpendicular to infinitely large conducting plate. The results of computations show the effect of pressure on the electron and negative-ion densities along the axial direction, electric field distribution along the axis of symmetry and current density on the ground plane.