常压下气体放电等离子体振荡的实验与理论研究

摘要

在实验上研究了高压交流电弧发生器电极间隙的气体放电及等离子体振荡，观察到了气体放电过程中的纳秒脉冲．以电子的流体运动方程和麦克斯韦方程为理论基础，利用δ函数来描述交变外电场作用下电极处的电子堆积现象，建立了常压下气体放电时等离子体在外电场中振荡的理论模型，通过Laplace变换求解出电极间的放电电压．理论与实验结果基本符合，从而可估算出实验中等离子体的电子数密度为1．3×1012／m3．%The gas discharge and plasma oscillation between the electrodes of high-voltage alternating current arc generator are studied, and the nanosecond pulsed phenomenon in the gas discharge process is observed at atmospheric pressure. Electron accumulation phenomenon under the action of alternating electric field is described by using a δ function. Based on the equation of electron fluid motion and Maxwell equations, the discharge voltage between the electrodes is depicted theortically. Theoretical and experimental results are consistent with each other basically, and the electron density is estimated to be 1.3× 1012/m3.