新型滑动弧放电等离子体的特性

Characteristic of Novel Gliding Arc Discharge Plasma

目前研究人员对滑动弧放电的应用和纯气流推动的滑动弧放电等离子体的理论分析及计算方面研究较多,而对气液滑动弧放电的理论分析及计算方面则研究甚少。为此,对新型气液滑动弧放电进行了电信号测量和图像测量。在半个周期10ms内,电弧电压随时间呈锯齿状变化;高速摄影照片观察发现单个电弧由电弧核心区和外延电晕区组成,电弧核心区直径<2.5mm。根据电参数、图像分析结果及Elenbass-Heller方程,建立了交流等离子体通道理论模型,通过该模型可求出气液等离子体电弧的电场强度、电子密度和沿轴线的温度等参数。

A novel air-liquid gliding arc discharge reactor was designed to obtain the electrical parameters and image characteristics. It is found that the voltage cycles are characterized by a moderate increase in the tension which is represented by a peak followed by an abrupt decrease and a current peak in the half period （10 ms）. Photographs taken with a high-speed camera clearly show gliding arcs including of two zones：plasma wire （2.5 mm） and surrounding glow zone. Based on physical experimental results and Ellenbaas-Heller equation,a simple theoretical model of AC gas-liquid plasma arc channel is given which enables determination of the density of free electrons,electric field strength,and axial temperature,etc.