摘要
重复频率脉冲下气体放电发展与演变过程与单次脉冲下有着显著的差异,针对脉冲施加时期与脉冲间隔时期所涉及物理过程与时间尺度的差异,采取全局–粒子耦合模拟的方式,对含有氧气杂质的大气压氮气氛围下针–板电极流注放电过程进行了连续3个负纳秒脉冲的二维全局–粒子耦合仿真模拟,脉冲间隔时间为1 ms。研究发现:首个脉冲施加时期,放电发展过程中出现了从电离云到流注的转变。首个脉冲间隔时期的剩余自由电子数密度与正空间电荷始终处于同一数量级上,显著高于负空间电荷,因此在后序脉冲施加时期的初始条件设置阶段可以近似忽略剩余带电粒子中的负离子。而在第2及第3个脉冲施加时期,放电发展过程呈现出三阶段分步电离模式:1)初始电离云;2)放电通道融合;3)快速击穿。
The propagation and evolution of streamer under repetitive nanosecond pulses(RNP)is significantly different from that under single pulse.In view of the differences in the physical processes and time scales involved in the pulse period and interval period,this paper adopts a global-particle coupling method to simulate streamer discharge under continuous pulses in nitrogen at atmospheric pressure,and the interval time is 1 ms.The study reveals that,during the first pulse period,a transition from inception cloud to streamer occurs.The number density of remaining free electrons in the first interval is always on the same order of magnitude as the positive space charge,which is significantly higher than the negative space charge.Therefore,the negative ions in the remaining charged particles can be ignored in the initial condition setting of the subsequent pulse period.In the second and third pulse periods,the discharge channel presents a three-stage ionization mode of 1)initial cloud;2)discharge channel fusion;3)rapid breakdown.
作者
李晨颉
郑昕雷
赵政
汪毅峰
李江涛
LI Chenjie;ZHENG Xinlei;ZHAO Zheng;WANG Yifeng;LI Jiangtao(Institute of High Voltage Physics and Engineering,Xi'an Jiaotong University,Xi'an 710100,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第2期789-797,共9页
High Voltage Engineering
基金
国家自然科学基金(52077168)。
关键词
重复频率纳秒脉冲
流注放电
空间电荷
放电模式转变
全局–粒子模拟
repetitive nanosecond pulses
streamer discharge
space charge
discharge regime transition
global-particle simulation
