基于COMSOL的水中脉冲放电等离子体数值模拟研究  

Numerical Simulation of Pulsed Discharge Plasma in Water Based on COMSOL

作　　者：朱志豪 兰生[1] 冯志远 鲁坤[1] ZHU Zhihao;LAN Sheng;FENG Zhiyuan;LU Kun(College of Electrical Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学电气与自动化学院,福州350108

出　　处：《真空科学与技术学报》2022年第4期304-310,共7页Chinese Journal of Vacuum Science and Technology

基　　金：福建省自然基金项目(2021J01109);晋江市福大科教园区发展中心科研项目(2019-JJFDKY-38)。

摘　　要：本文基于COMSOL建立了水中脉冲放电二维轴对称流体模型,通过数值模拟求解载流子的对流与扩散方程计算了纳秒脉冲电压下水中放电产生等离子体的电子密度数值。为研究不不同放电条件对放电过程的影响,本文分析了脉冲电压幅值、脉冲电压上升沿长短与电极间隙距离改变时等离子体电子密度的变化情况。仿真结果表明:随着脉冲电压幅值增大,水中脉冲放电等离子体电子密度增大,且峰值出现时间较快、脉冲电压上升沿较短导致正离子流注发展速度加快、在一定范围内放电间隙变长会获得更高的等离子体电子密度。In this paper,the two-dimensional axisymmetric fluid model of pulsed discharge in water is established based on COMSOL. The convection and diffusion equations of carriers are solved by numerical simulation,and the electron density of plasma produced by discharge in water at nanosecond pulsed voltage is calculated. In order to study the effects of different discharge conditions on the discharge process,the changes of plasma electron density with the changes of pulse voltage amplitude,pulse voltage rising edge and electrode gap distance are analyzed in this paper. The simulation results show that with the increase of pulse voltage amplitude,the electron density of pulsed discharge plasma in water increases,and the peak time is faster,the rising edge of pulse voltage is shorter,resulting in the acceleration of positive ion streamer development,and the longer discharge gap in a certain range,higher plasma electron density will be obtained.

关 键 词：数值模拟 水中放电 等离子体 电子密度 

分 类 号：O53[理学—等离子体物理]