激光辅助水中脉冲放电生成等离子体的数值模拟  

Numerical Simulation of Plasma Generated by Laser-Assisted Pulsed Discharge in Water

作　　者：钱杨 冯音琦[1] 黄民双[1] 许友文 Qian Yang;Feng Yinqi;Huang Minshuang;Xu Youwen(Beijing Area Major Laboratory Opto-Mechatronic Equipment Technology,Beijing Institute ofPetrochemical Technology,Beijing 102617)

机构地区：[1]北京石油化工学院光机电装备技术北京市重点实验室,北京102617

出　　处：《激光与光电子学进展》2021年第7期395-402,共8页Laser & Optoelectronics Progress

基　　金：北京市自然科学基金资助项目(3172012)。

摘　　要：提出了激光辅助水中脉冲放电生成等离子体的方法,结合经典的Drude模型,建立激光注入水中脉冲放电系统生成等离子体的二维流体数学模型,给出相应的数学方程,利用COMSOL Multiphysics软件模拟带电粒子与垂直注入等离子体通道的激光的相互作用过程,探讨了一定能量的激光作用于水介质脉冲放电系统时局部电子密度所受的影响。由初步的仿真结果可知,在电场放电通道中,加入能量为50 mJ、光斑直径为0.1 mm的激光到等离子体通道内,其电子密度峰值从1.65×1021m^(-3)突增到8.29×1021m^(-3)。该过程对于提高等离子体的电离率起到了显著作用,说明激光辅助水中脉冲放电生成等离子体的技术方案是可行的。A laser-assisted pulsed discharge method for generating plasma in water is proposed.Combining with the classical Drude model,a two-dimensional fluid mathematical model of the plasma generated by laser injected into the water pulsed discharge system is established,and the corresponding mathematical equations are given.The COMSOL Multiphysics software is used to simulate the interaction process between charged particles and laser vertically injected into the plasma channel,The local electron density when the laser with a certain energy is applied to the water dielectric pulse discharge system is studied.The preliminary simulation results show that the peak value of electron density increases from 1.65×1021 m^(-3) to 8.29×1021 m^(-3) when a laser with 50 mJ energy and 0.1 mm spot diameter is added into the plasma channel.This process plays a significant role in improving the ionization rate of plasma,which indicates that the technical scheme of laser assisted pulse discharge in water to generate plasma is feasible.

关 键 词：等离子体 激光诱导 数值模拟 激光与物质相互作用 

分 类 号：TN249[电子电信—物理电子学]