介质阻挡放电的放电过程仿真研究

Simulation of the Discharge Process of Dielectric Barrier Discharge

为深入地理解介质阻挡放电(DBD)的放电机理和实现DBD等离子体的大规模工业应用,采用基于连续性方程和泊松方程的DBD模型仿真研究了大气压空气中DBD的放电过程,计算得到放电空间的电子密度、电场强度和电压电流随时间变化的规律,讨论了阻挡介质在DBD放电不同阶段的作用。仿真结果表明,DBD的微放电过程可分为电子崩、流注和放电熄灭3个连续的阶段。在电子崩和流注阶段间,阻挡介质主要起到加速流注形成的作用;而在放电熄灭阶段,阻挡介质主要起到限制放电电流的自由增长,从而阻止放电发展到电弧的作用。

For better understanding the discharge mechanisms of dielectric harrier discharge （DBD） and achieving large-scale industrial applications of DBD plasmas, a discharge model based on continuity equations and Poisson＇s equation is established to simulate the discharge process in DBD in atmospheric air, and the variation of electron density, electric field, discharge voltage and discharge current with time is calculated, with the functions of dielectric barriers in different phases of the discharge being discussed. The simulation results show that the evolution of micro-discharges in DBD occurs sequentially in three distinctive phases of avalanche, streamer, and decay. Between the phase of avalanche and streamer, the main function of the barriers is to accelerate the formation of the streamer, while in the phase of decay, the main function of the barriers is to prevent the increasing of the discharge current and thus to prevent the occurrence of arc.