为了进一步明确大气压多脉冲辉光放电的形成机理,采用扩展的一维等离子体流体模型数值研究了大气压多脉冲介质阻挡均匀放电的放电特性.该模型增加了电子能量守恒方程,考虑了电子温度对电子输运系数的影响.结果表明大气压氦气多脉冲放电中的每个电流脉冲都处于汤森放电模式,上一次放电为下一次放电提供了种子电子,导致了后面的击穿电压依次降低,放电电流脉冲依次减小.随着驱动频率的增加,电流脉冲个数减少,但是脉冲电流大小增加.随着驱动电压幅值的增加,不仅电流脉冲个数增加,脉冲大小也增加,模拟结果与实验结果定量吻合.
In order to further understand the formation mechanism of the multiple current pulse phenomena in atmospheric-pressure dielectric barrier uniform discharges, a one-dimensional extended fluid model has been established. Taking the effects of electron temperature on electron transport parameters into account, an additional electron energy balance equation has been introduced into the extended fluid model. It is demonstrated that discharges with multiple current pulses always operate in the Townsend mode. The early discharge provides lots of seed electrons for the subsequent discharge, resulting in the decreases of both breakdown voltage and current pulse in the successive discharges. As the driving frequency increases, the number of current pulses decreases but their magnitudes increase. As the driving voltage amplitude increases, both the number and magnitude of the current pulses increase. These simulation results are in good agreement with experimental results.
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