不同海拔高度下电晕放电等离子体粒子特性的仿真研究

Simulation study of plasma particle characteristics of corona discharge at different altitudes

电晕放电作为等离子体的一种重要获取手段,它的放电特性及其降解能力与所处空气环境有着密切的关系.为了得到不同海拔高度对电晕放电特性和等离子体降解能力的影响,本文通过COMSOL软件基于流体动力学模型,对不同海拔高度的放电模型进行数值模拟计算.分别对电流波形、影响等离子体降解能力的电子密度、平均电子能量等物理量随海拔高度变化的规律进行研究.结果表明,海拔越高,气压越低,环境温度越低,电流脉冲峰值越高,频率越高,脉冲启动时间越提前.脉冲波形的上升时间减小、下降时间增大.同时,电子密度以及平均电子能量也会随着海拔高度的升高而增强.

As an important means of obtaining plasma,the discharge characteristics of corona discharge and its degradation capacity are closely related to the air environment in which it is located.In order to obtain the effects of different altitudes on the corona discharge characteristics and plasma degradation capacity,a hydrodynamic model was established by COMSOL software,and numerical simulations were performed for the discharge models at different altitudes,respectively.The variation laws of physical quantities,such as current waveform,electron density and average electron energy that affect plasma degradation ability,with altitude were investigated.It is calculated that the higher the altitude,the lower the air pressure and the lower the ambient temperature,the higher the peak current pulse,the higher the frequency and the earlier the start-up time.The rise time and fall time of the pulse waveform also change,and the electron density and the average electron energy,which affect the degradation ability of corona plasma,also increase with the altitude.