大气压氦气中电阻与介质阻挡多峰放电特性的数值模拟

Numerical Simulation of Multi-peak Behavior of Resistance Dielectric Barrier Discharges in Atmospheric Helium

通过建立大气压氦气中电阻与介质阻挡放电的一维自洽流体数值模型,研究了重复频率为5kHz的正弦电压激发的放电中多个放电电流密度峰特性.随着电阻值从100kΩ增加到500kΩ,放电电流密度峰的数目减少,且放电电流密度的峰值降低,这主要是由于对应于电流密度峰值时刻的电阻上的电压升高,而气体电压降低导致的.在放电时间周期中的电子密度、电场强度和第一汤森系数的时空演变特性显示了放电的动力学过程.该数值模拟提出了大气压介质阻挡放电中通过引入电阻提高放电稳定性的方法.

One-dimensional self-consistent fluid model was developed for resistance dielectric barrier discharge in atmospheric helium,which was employed for investigating the multi-peak behavior of discharge current density excited by sinusoidal voltage at repetitive frequency of 5 kHz.It suggests that with introducing the resistors（100-500 kΩ）,the number of discharge current density peak is reduced,and the amplitude of discharge current density goes down,which can be explained by the waveforms of gas voltage and resistor voltage,corresponding to that of the discharge current density.The discharge dynamics is illustrated by the spatio-temporal evolution of electron density,electric field and first Townsend coefficient in discharge gap.The numerical simulation proposes a way to improve the discharge stability of atmospheric dielectric barrier discharge by introducing resistance.