脉冲电流源作用下大气压介质阻挡放电的特性分析

针对目前研究人员主要是对正弦电压或脉冲电压下大气压介质阻挡放电 (Atmospheric Pressure Dielectric Barrier Discharge, APDBD)的特性进行分析以及少有研究人员对电流源作用下APDBD特性进行分析这一现状，以双极性脉冲电流激励下的氦气(He)型APDBD为研究对象，通过构建APDBD一维流体模型对APDBD的伏安–时间特性、氦离子(He⁺)与激发态的氦原子(He^*)的时空分布特征进行数值分析。结果表明：He⁺、He^*的数密度与外施电流幅值存在正相关性、与气隙宽度存在负相关性；气隙击穿电压与外施电流幅值呈负相关性、与气隙宽度呈正相关性；气隙宽度和外施电流幅值的增加都会使He^*密集区更分散。此外，还对APDBD的电气等效电路、气隙宽度的选择、电流幅值的设定、电流脉宽、电流上升时间及电源频率对APDBD特性的影响进行了讨论。

A Characteristic Analysis of Atmospheric Pressure Dielectric Barrier Discharge Powered by Pulse Current Source

Since the characteristics of Atmospheric Pressure Dielectric Barrier Discharges (APDBD) are usually analyzed under sinusoidal voltage or pulse voltage, the characteristics of APDBDs powered by current source have been little studied. To address the issue, the characteristics of APDBD filled with helium are studied under bipolar pulse current. By constructing a one-dimensional fluid model of the APDBD, the voltammetry property of the APDBD and the temporal-spatial distribution characteristics of helium ions (He⁺) and excited helium atoms (He^*) are numerically analyzed. The results show that the number density of He⁺ and He^* is proportional to the current amplitude, and negatively correlated with the gap width. The breakdown voltage of the gap is negatively correlated with the amplitude of the applied current and positively correlated with the width of the gap. The increase of the gap width and the current amplitude makes the He^* dense area more dispersed. In addition, the electrical equivalent circuit of APDBD, the selection of gap width effects, the effects of current amplitude, current rise time and working frequency are discussed.