CAJ | 학술논문

用流体模型研究高功率微波气体击穿时,电子能量分布函数常被假设为麦克斯韦分布形式,此假设可能将给模拟结果带来较大的误差.通过求解玻尔兹曼方程,得到非平衡状态下的电子能量分布函数.分别将上述两类分布函数引入到流体模型中,对氩气击穿进行了数值模拟.结果表明,基于非平衡分布函数得到的击穿时间与粒子模拟结果符合得很好,而当平均电子能量较低时,麦克斯韦分布函数的高能尾部导致了较短的击穿时间.最后,采用非平衡分布函数计算了不同压强下的氩气击穿阈值,发现其与实验结果基本符合.
용류체모형연구고공솔미파기체격천시,전자능량분포함수상피가설위맥극사위분포형식,차가설가능장급모의결과대래교대적오차.통과구해파이자만방정,득도비평형상태하적전자능량분포함수.분별장상술량류분포함수인입도류체모형중,대아기격천진행료수치모의.결과표명,기우비평형분포함수득도적격천시간여입자모의결과부합득흔호,이당평균전자능량교저시,맥극사위분포함수적고능미부도치료교단적격천시간.최후,채용비평형분포함수계산료불동압강하적아기격천역치,발현기여실험결과기본부합.
The electron energy distribution function (EEDF) is usually assumed to be of the Maxwellian distribution in the fluid model in the simulation of high power microwave breakdown in gas. However, this assumption may lead to some large errors in the simulations. In this paper we compute the non-equilibrium EEDF via solving the Boltzmann equation directly, and incorporate it into the fluid model for argon breakdown. Numerical simulations show that the breakdown time obtained by the fluid model with the non-equilibrium EEDF accords well with the Particle-in-cell-Monte Carlo collision simulation result, while the Maxwellian EEDF has higher energy tail and results in faster breakdown time at low mean electron energy. Based on the non-equilibrium EEDF, the dependence of the breakdown threshold on the pressure predicted by the fluid model accord well with the argon breakdown experimental result.