脉冲参数对大气压亚微秒脉冲辉光放电的影响  

Dependence of Sub-microsecond Pulsed Atmospheric Pressure Glow Discharge on Parameters of Voltage Pulses

作　　者：孙晨昊 李慎 宋书通 郭颖[1] 张菁[1] 石建军[1] 

机构地区：[1]东华大学理学院,上海201620

出　　处：《东华大学学报（自然科学版）》2017年第5期759-763,共5页Journal of Donghua University(Natural Science)

基　　金：国家自然科学基金资助项目(11475043;11375042)

摘　　要：通过大气压氦气亚微秒脉冲辉光放电的一维自洽流体数值模型,研究了亚微秒脉冲电压的脉宽和幅值对放电特性的影响.当放电脉冲电流密度幅值维持在约2 000A/m^2时,随着脉冲电压脉宽从300ns增加到900ns,放电电流密度脉冲的脉宽相应增加,脉冲电压幅值从652.2V降低到557.5V.在电极表面引入介质层以后,每个脉冲电压会产生两个放电电流密度峰,其中,第一个放电电流密度峰不随脉冲电压脉宽变化,第二个放电电流密度峰的强度有一定的增长,而且其发生时刻对应于脉冲电压的下降沿时刻.在介质阻挡脉冲辉光放电中,随着脉冲电压幅值从2 000V增加到3 500V时,两个放电电流密度峰的幅值分别从1 160.6A/m^2增加到2 697.9A/m^2和从963.4A/m^2增加到1 954.5A/m^2,而且放电电流密度峰发生时刻也向脉冲电压上升沿和下降沿开始处移动.该数值模拟研究有助于深入了解大气压脉冲辉光放电的特性和机理.The dependence of sub-microsecond pulsed atmospheric pressure glow discharge on pulse duration and amplitude of voltage pulses is investigated by a one-dimensional self-consistent fluid model in atmospheric helium. With increasing of the duration of voltage pulse and fixed amplitude of discharge current density about 2 000 A/m2, the duration of discharge current density grows and the amplitude of pulse voltage reduces from 652.2 V to 557.5 V. There are two peaks of discharge current density with introducing the dielectric barrier above the electrode surfaces during one voltage pulse. With elevating the duration and fixed amplitude of voltage pulse, the first peak of discharge current density retains and the amplitude of second discharge current density increases, which happens at the falling phase of voltage pulse. In the dielectric barrier pulsed glow discharges, both amplitudes of discharge current density grow from 1 160.6 A/m2 to 2 697.9 A/m2 and from 963.4 A/m2 to 1 954.5 A/m2 , respectively, and the time instants of both current density peaks move toward the beginning of rising and falling phase of voltage pulse, when the amplitude of pulse voltage increases from 2 000 V to 3 500 V. This numerical simulation study helps the better understanding of discharge characteristics and mechanism of atmospheric pressure pulsed glow discharges.

关 键 词：脉冲辉光放电 数值模拟 大气压辉光放电 

分 类 号：O531[理学—等离子体物理]