Simulation Analysis on Dielectric Barrier Glow Discharge in Short Ar Gap Under Atmospheric Pressure

In order to analyze the mechanism of atmospheric pressure glow discharge(APGD) produced by short Ar gap dielectric barrier discharge(DBD),one-dimensional self-consistent fluid discharge model was proposed.And the finite-element method was employed to compute this discharge.The evolvement waveforms of gas voltage,discharge current density and barrier surface charge were investigated.And the distributions of particles density and electrical field were also obtained.The results show that this APGD is a capacitive discharge,and the breakdown occurs once in every half cycle;the discharge space can be divided to cathode fall region,negative glow,positive column and anode glow region by the distributions of electrical field and particles densities,which indicates that it is a typical glow discharge under the research conditions.Furthermore,the influence of different relative permittivity e on discharge characteristics is analyzed.The results show that with the increase of e,the discharge current density and surface charge density on dielectric are increased gradually,and the time of breaks down ahead slightly.