In order to investigate the influence of air gap length on dielectric barrier discharge at atmos-pheric pressure,and further analyze the discharge mechanism and characteristics of dielectric barrier dis-charge,under the condition of a constant external electric field,the fluid model was used to simulate the microscopic process of discharge in coaxial plate gap inhibited by epoxy resin less than 3 mm long.The influence of gap length on the characteristics of air gap discharge was investigated from the perspective of charged particle microscopic motion.Simulation results indicate that in gaps with lengths less than 3 mm,epoxy resin prevents the development of electron avalanches into streamers,resulting in Townsend dis-charge.The impact of gap length on the discharge process is primarily achieved by influencing the distri-bution of charged particles and the electric field.Gap length has almost no effect on the development speed of the discharge.When electron avalanches approach the anode in shorter gaps,the density of e-lectron in the front of avalanche is lower than that in longer gaps.As the gap length increases,the dis-charge current peak value increases,and both the rise and fall rates of the current increase while the pulse width decreases.Compared theoretical calculation with experimental results,the rationality of this simulation method was verified.
关键词
介质阻挡放电/气隙长度/汤森放电/电子崩/流体模型/放电电流
Key words
dielectric barrier discharge/air gap length/Townsend discharge/electron avalanche/fluid model/discharge current
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