Numerical simulation of coaxial–coplanar dielectric-barrier discharge in atmospheric helium

A self-consistent two-dimensional fluid model is employed to investigate the coaxial–coplanar dielectric-barrier discharge (DBD) excited by sinusoidal voltage in atmospheric helium. Simulation results show that there are two current pulses positive half cycle, but only one negative cycle. The transformed from Townsend-like mode, through glow-like and back mode both cycles, during which electric field line exhibits an arc-shape profile due configuration of electrodes. In cathode fall located near inner edge ground electrode at first peak, close outer second peak. At distributed high electrode. Since instantaneous anode on same side space, dielectric layer simultaneously covered surface charges movement charged particles. It also found charge density changes significantly facing further study reveals a stronger always occurs central circular area alternately complementary takes place periphery ring cycle activator–inhibitor effect. This feature helpful for producing uniform plasma whole DBD.