大气压介质阻挡辉光放电脉冲的阴极位降区特性及其影响因素的数值仿真

发布时间：2018-04-05 03:22

本文选题：大气压介质阻挡放电　切入点：阴极位降区　出处：《物理学报》2017年02期

【摘要】：大气压介质阻挡放电常用于产生低温等离子体,其放电特性已成为当前的研究热点.本文针对大气压氦气介质阻挡放电结构建立了流体数值仿真模型,研究其辉光放电脉冲特性.从发光结构、粒子分布和电场分布等方面说明了该类型放电辉光结构的时空演化过程;分别从电子增长率和电场强度分布两个角度比较和分析了该类型放电中阴极位降区范围的定义,并探讨了发光最强点位置与阴极位降区边界的关系,认为利用电场强度分布来定义该类型放电的阴极位降区范围更加合理,且在电流下降沿内,光强最强点始终处于阴极位降区内部.研究了外施电压、阻挡介质二次电子发射系数γ和N_2含量对间隙电压、电流密度和阴极位降区特性等的影响规律.发现:在二次电子发射系数γ不变时,阴极位降区宽度与电流密度具有负线性相关关系;利用阴极位降区的伏安特性证明了该类型放电属于亚辉光放电靠近正常辉光放电的部分;主要考虑N_2与He的Penning效应时,电流密度和带电粒子密度在一定N_2含量下具有最大值等.
[Abstract]:Atmospheric dielectric barrier discharge (DBD) is often used to produce low temperature plasma.In this paper, a numerical simulation model of helium dielectric barrier discharge at atmospheric pressure is established, and the characteristics of glow discharge pulse are studied.The spatiotemporal evolution of this type of discharge glow structure is explained from the aspects of luminescent structure, particle distribution and electric field distribution.The definition of the range of cathode drop region in this type of discharge is compared and analyzed from the point of view of electron growth rate and electric field intensity distribution, and the relationship between the position of the strongest luminescent point and the boundary of the cathode drop region is discussed.It is considered that it is more reasonable to define the range of cathodic potential drop region by using electric field intensity distribution, and the strongest point of light intensity is always within the cathode drop region within the current drop edge.The effects of applied voltage, secondary electron emission coefficient 纬 of barrier dielectric and content of N\ -2 on gap voltage, current density and cathodic potential drop are studied.It is found that there is a negative linear correlation between the width of the cathode potential drop region and the current density when the secondary electron emission coefficient 纬 is constant.It is proved that this type of discharge belongs to the subglow discharge close to the normal glow discharge by using the volt-ampere characteristics of the cathode potential drop region, and the current density and charged particle density have the maximum value when the Penning effect of N _ 2 and he is considered.
【作者单位】：西安交通大学电气工程学院电力设备电气绝缘国家重点实验室;
【基金】：国家自然科学基金(批准号:51307133,51521065,51477135) 国家重点基础研究发展计划(批准号:2015CB251003) 中国博士后科学基金(批准号:2016M590946) 中央高校基本科研业务费(批准号:xjj2016003) 电力设备电气绝缘国家重点实验室基金(批准号:EIPE16314)资助的课题~~
【分类号】：O461.21

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