Characteristics of stationary negative corona discharge in atmospheric air

Abstract

The paper presents a 2D-axisymmetric multi-fluid model of a stationary negative corona discharge in atmospheric-pressure air in the needle-to-plane diode. Discharges with a cathode tip with a curvature radius of 20–200 μm, a gap length of 3–10 mm, and a power source voltage of 5–35 kV were studied. The spatial distribution of the discharge plasma at a current level of 2.2 mA with a gap voltage of 5.8 kV, gap length of 10 mm, tip radius of 100 μm is described in detail. This corona discharge has a glow discharge structure with a subnormal current density of 5 A/cm2.