The Effect of Boundary Conditions Settings on Port Current Characteristics of Streamer Discharge in Air Using Numerical Simulation

In this paper, a numerical simulation method is presented to study the effect of boundary conditions settings on port current characteristics of streamer discharge in air. A two-dimensional axisymmetric model of streamer discharge is established to analyze the effects of the electrode radius and boundary conditions on port current characteristics of the ground and high-voltage electrode, including the conduction current, displacement current and total current. It is shown that the conduction current is mainly distributed within the streamer discharge channel; the ground electrode displacement current has a negative value in the outer ring; the ground electrode and high-voltage electrode total currents are different; and the ground electrode and high-voltage electrode total currents are different when different boundary conditions are applied. The port current characteristics obtained by numerical simulation in this paper are the key physical quantities for comparison with experimental data, which are instructive for the setting of boundary conditions.