高电压技术2016，Vol.42Issue(3)：724-730,7.DOI:10.13336/j.1003-6520.hve.20160308002
低气压直流辉光放电数值模拟与实验研究
Numerical Simulation and Experimental Study for Low-pressure Direct-current Glow Discharge
摘要
Abstract
In order to further explore the mechanism of direct-current glow discharge at low pressure, we proposed a two-dimensional DC discharge model based on local equilibrium approximation.Then we investigated the process of transition from normal to abnormal glow and their characteristics, and compared the numerical simulation results of abnormal glow with experiment results.The results show that, in normal glow discharge, when the voltage increases slightly, the current increases as a result of the increase of discharge region, the thickness of cathode fall decreases, and the negative glow becomes manifest;when the voltage further increases, discharge region covers the whole surface of cathode, and can distinguish cathode fall, negative glow, and positive column regions, then the normal glow translates to the abnormal glow.The electrical field in cathode fall is 3 200 V/cm when the voltage is 400 V.When discharge is abnormal glow and gas pressure is constant, the increase of voltage can not change the structure of discharge, the current increases and discharge enhances because of the increase of electron number density in the negative glow;when voltage is 400 V and the air pressure is in the range of 50～420 Pa, the discharge current increases with the gas pressure.关键词
正常辉光/异常辉光/等离子体/气体放电/阴极位降/电子数密度Key words
normal glow/abnormal glow/plasma/gas discharge/cathode fall/electron number density引用本文复制引用
张百灵,王宇天,李益文,樊昊,高岭,段成铎..低气压直流辉光放电数值模拟与实验研究[J].高电压技术,2016,42(3):724-730,7.基金项目
国家自然科学基金(11372352 （）
51306207).Project supported by National Natural Science Foundation of China (11372352, 51306207). （11372352, 51306207）
