高压纳秒脉冲下介质阻挡放电的仿真研究

为研究ns脉冲高电压条件下介质阻挡放电的特性,在实验测量正极性ns脉冲介质阻挡放电电压、放电电流的基础上,根据脉冲介质阻挡放电等效电路对空气间隙上的气隙电压、放电电流及功率等参数进行了计算。计算结果表明,气隙电压、电流均为双极性脉冲且放电瞬时功率呈现双峰,分析认为此双极性脉冲是由介质层累积电荷所致;阻挡介质材料、厚度和施加电压频率不同,正极性ns脉冲介质阻挡放电结果也不同;施加电压类型对介质阻挡放电影响很大,相比交流、单极性μs脉冲和单极性亚μs脉冲的介质阻挡放电,正极性ns脉冲介质阻挡放电的放电电流大很多。

Simulation of Dielectric Barrier Discharges Using Nanosecond High Voltage Pulses

To study the dielectric barrier discharges(DBD) using pulsed high voltage,the voltage,the discharge current,and the instantaneous power on the air spacing are calculated according to an equivalent circuit,based on the measured voltage and current in the DBD experiments using positive unipolar nanosecond pulses.The calculated results indicate that both the voltage and the current of the air gap have both positive and negative pulses,and the instantaneous power also has two peaks,which are attributed to residual charges accumulated in the dielectric layer.The results of the DBD using positive unipolar nanosecond pulses are different as the material and thickness of the dielectric barrier,the frequency of applied voltage is different.The type of applied voltage could influence the DBD a lot.The discharge current of the DBD using positive unipolar nanosecond pulses is much bigger than that using AC,unipolar microsecond and submicrosecond pulses.