本文選題：大氣壓介質(zhì)阻擋放電　切入點：陰極位降區(qū)　出處：《物理學(xué)報》2017年02期

【摘要】：大氣壓介質(zhì)阻擋放電常用于產(chǎn)生低溫等離子體,其放電特性已成為當前的研究熱點.本文針對大氣壓氦氣介質(zhì)阻擋放電結(jié)構(gòu)建立了流體數(shù)值仿真模型,研究其輝光放電脈沖特性.從發(fā)光結(jié)構(gòu)、粒子分布和電場分布等方面說明了該類型放電輝光結(jié)構(gòu)的時空演化過程;分別從電子增長率和電場強度分布兩個角度比較和分析了該類型放電中陰極位降區(qū)范圍的定義,并探討了發(fā)光最強點位置與陰極位降區(qū)邊界的關(guān)系,認為利用電場強度分布來定義該類型放電的陰極位降區(qū)范圍更加合理,且在電流下降沿內(nèi),光強最強點始終處于陰極位降區(qū)內(nèi)部.研究了外施電壓、阻擋介質(zhì)二次電子發(fā)射系數(shù)γ和N_2含量對間隙電壓、電流密度和陰極位降區(qū)特性等的影響規(guī)律.發(fā)現(xiàn):在二次電子發(fā)射系數(shù)γ不變時,陰極位降區(qū)寬度與電流密度具有負線性相關(guān)關(guān)系;利用陰極位降區(qū)的伏安特性證明了該類型放電屬于亞輝光放電靠近正常輝光放電的部分;主要考慮N_2與He的Penning效應(yīng)時,電流密度和帶電粒子密度在一定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 緯 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 緯 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.
【作者單位】： 西安交通大學(xué)電氣工程學(xué)院電力設(shè)備電氣絕緣國家重點實驗室;
【基金】：國家自然科學(xué)基金(批準號:51307133,51521065,51477135) 國家重點基礎(chǔ)研究發(fā)展計劃(批準號:2015CB251003) 中國博士后科學(xué)基金(批準號:2016M590946) 中央高�；究蒲袠I(yè)務(wù)費(批準號:xjj2016003) 電力設(shè)備電氣絕緣國家重點實驗室基金(批準號:EIPE16314)資助的課題~~
【分類號】：O461.21

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