气隙宽度对大气压氦气介质阻挡放电多脉冲特性影响的仿真研究
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摘要
气隙宽度d是介质阻挡放电(DBD)的一个重要调控参数。通过一维流体模型研究d对平行板电极大气压氦气DBD多脉冲特性的影响。重点关注电流脉冲幅值Im、电流脉冲宽度l和脉冲幅值相位??等特征参数。仿真结果显示,当d从0.5mm增加至4.5mm时,Im先增大、后缓慢减小;l持续降低,并最终趋于稳定;??表现为单调增加。当d小于3mm时,放电表现为多电流脉冲(MCP)形式。进一步增加d,放电转化为单电流脉冲(SCP)形式。放电机理的分析表明,短气隙(d≤1.5mm)下的放电是汤森放电。此时,阳极附近易于形成局部的高密度空间电荷区,其自建电场与外施电场方向一致,趋向于增强气隙电压Vg,从而使某次放电熄灭后的Vg能够快速恢复到再次击穿水平。在较宽气隙(d≥2.0mm)下,放电表现为辉光放电模式。由于辉光放电贯穿整个气隙,残留的空间电荷呈近似均匀分布(即自建电场强度水平较低),导致气隙在半周期内难以再次击穿。
Gap width d is a significant regulatory parameter of dielectric barrier discharges(DBDs). In this paper, a one-dimensional fluid model with parallel plate electrodes was built to study the influence of gap width on the multipeak characteristics of the atmospheric helium DBDs. The study was focus on three parameters, namely the current pulse amplitude Im, the current pulse width l and the pulse amplitude phase ?. Results show that upregulating the gap width from 0.5 mm to 4.5 mm, Imfirst rises, then declines; l continuously descends, and finally tends to be stable; and ? increases monotonically. When d is less than 3 mm, the discharge represents multi current pulses(MCP). With larger d, the discharge displays a single current pulse(SCP). Discharge mechanism analysis indicates the multipeak discharge in short gap(d≤1.5 mm) operates at the Townsend discharge mode. In the case,local high-density space charge is formed in the vicinity of the anode, which builds an electric field having the same direction with the applied electric field, thus enhancing gap voltage Vg. Therefore, Vg can be quickly recovered to the level to trigger the successive breakdown, resulting in the MCP. The discharge in a wide gap(d ≥ 2.0 mm) manifests the glow discharge characteristics. The glow discharge exists in the gap where the residual space charge is approximately well distributed, i.e. it builds a lower electric filed, which makes it difficult for the discharge to breakdown again in half cycle.
Gap width d is a significant regulatory parameter of dielectric barrier discharges(DBDs). In this paper, a one-dimensional fluid model with parallel plate electrodes was built to study the influence of gap width on the multipeak characteristics of the atmospheric helium DBDs. The study was focus on three parameters, namely the current pulse amplitude Im, the current pulse width l and the pulse amplitude phase ?. Results show that upregulating the gap width from 0.5 mm to 4.5 mm, Imfirst rises, then declines; l continuously descends, and finally tends to be stable; and ? increases monotonically. When d is less than 3 mm, the discharge represents multi current pulses(MCP). With larger d, the discharge displays a single current pulse(SCP). Discharge mechanism analysis indicates the multipeak discharge in short gap(d≤1.5 mm) operates at the Townsend discharge mode. In the case,local high-density space charge is formed in the vicinity of the anode, which builds an electric field having the same direction with the applied electric field, thus enhancing gap voltage Vg. Therefore, Vg can be quickly recovered to the level to trigger the successive breakdown, resulting in the MCP. The discharge in a wide gap(d ≥ 2.0 mm) manifests the glow discharge characteristics. The glow discharge exists in the gap where the residual space charge is approximately well distributed, i.e. it builds a lower electric filed, which makes it difficult for the discharge to breakdown again in half cycle.
引文
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[21]王艳辉,王德真.大气压下多脉冲均匀介质阻挡放电的研究[J].物理学报,2005,54(3):1295-1300.Wang Yanhui,Wang Dezhen.Study on homogeneous multiple-pulse barrier discharge at atmospheric pressure[J].Acta Physica Sinica,2005,54(3):1295-1300.
[22]Hagelaar G,Pitchford L.Solving the Boltzman equation to obtain electron transport coefficients and rate coefficients for fluid models[J].Plasma Sources Science and Technology,2005,14(4):722-733.
[23]Lazarou C,Belmonte T,Chiper A S,et al.Numerical modelling of the effect of dry air traces in a helium parallel plate dielectric barrier discharge[J].Plasma Sources Science&Technology,2016,25(5):055023.
[24]宁文军,戴栋,张雨晖,等.短间隙大气压氦气介质阻挡放电中非线性现象的1维流体仿真[J].高电压技术,2017,43(6):1845-1853.Ning Wenjun,Dai Dong,Zhang Yuhui,et al.Study on the nonlinear phenomena in a short-gap atmospheric helium dielectric barrier discharge with one dimensional fluid model[J].High Voltage Engineering,2017,43(6):1845-1853.
[25]Walsh J L,Janson N B,Iza F,et al.Chaos in atmospheric-pressure plasma jets[J].Plasma Sources Science&Technology,2012,21(3):034008.
[2]邵涛,章程,王瑞雪,等.大气压脉冲气体放电与等离子体应用[J].高电压技术,2016,42(3):685-705.Shao Tao,Zhang Cheng,Wang Ruixue,et al.Atmospheric-pressure pulsed gas discharge and pulsed plasma application[J].High Voltage Engineering,2016,42(3):685-705.
[3]Cui Weisheng,Liu Wenzheng,Wang Tahan,et al.The application of atmospheric pressure dielectric barrier discharge plasma on the cleaning of photovoltaic panels[J].IEEE Transactions on Plasma Science,2017,45(2):328-335.
[4]王瑞雪,海彬,田思理,等.绝缘材料表面电荷测量优化及等离子体处理对其表面电特性的影响[J].高电压技术,2017,43(6):1808-1815.Wang Ruixue,Hai Bin,Tian Sili,et al.Optimization of dielectric material surface charge measurement and impact of plasma treatment on their surface electrical characteristics[J].High Voltage Engineering,2017,43(6):1808-1815.
[5]海彬,章程,王瑞雪,等.等离子体沉积类SiO2薄膜抑制环氧树脂表面电荷积聚[J].高电压技术,2017,43(2):375-384.Hai Bin,Zhang Cheng,Wang Ruixue,et al.Plasma depositing SiO2-like film to suppress surface charge accumulation on epoxy resin[J].High Voltage Engineering,2017,43(2):375-384.
[6]于大海,叶齐政.旋转电极5kHz介质阻挡放电臭氧制备[J].高电压技术,2016,42(2):439-445.Yu Dahai,Ye Qizheng.Ozone generation using 5kHz dielectric barrier discharge with rotating electrode[J].High Voltage Engineering,2016,42(2):439-445.
[7]张晓星,胡雄雄,肖焓艳.介质阻挡放电等离子体降解SF6的实验与仿真研究[J].中国电机工程学报,2017,37(8):2455-2465.Zhang Xiaoxing,Hu Xiongxiong,Xiao Hanyan.Experimental and simulation study on degradation of SF6 by dielectric barrier discharge plasma[J].Proceedings of the CSEE,2017,37(8):2455-2465.
[8]Gutiérrez-León D G,López-Callejas R,Pe?a-Eguiluz R,et al.Experimental evaluation of DBD reactor applied to bacterial inactivation in water flowing continuously[J].IEEE Transactions on Plasma Science,2016,44(11):2653-2659.
[9]高远,张帅,刘峰,等.脉冲介质阻挡放电等离子体催化CH4直接转化[J].电工技术学报,2017,32(2):61-69.Gao Yuan,Zhang Shuai,Liu Feng,et al.Plasma enhanced CH4 direct conversion in pulsed dielectric barrier discharges[J].Transactions of China Electrotechnical Society,2017,32(2):61-69.
[10]Gadkari S,Gu S.Numerical investigation of co-axial DBD:Influence of relative permittivity of the dielectric barrier,applied voltage amplitude and frequency[J].Physics of Plasmas,2017,24(5):602-614.
[11]潘光胜,谭震宇,王晓龙,等.高氧浓度下大气压Ar/O2脉冲介质阻挡放电频率特性数值研究[J].电工技术学报,2017,32(20):71-81.Pan Guangsheng,Tan Zhenyu,Wang Xiaolong,et al.A numerical study on the frequency effects of the electrical characteristics of the pulsed dielectric barrier discharge in Ar/O2 with high oxygen concentration at atmospheric pressure[J].Transactions of China Electrotechnical Society,2017,32(20):71-81.
[12]姜慧,邵涛,章程,等.不同电极间距下纳秒脉冲表面介质阻挡放电分布特性[J].电工技术学报,2017,32(2):33-42.Jiang Hui,Shao Tao,Zhang Cheng,et al.Distribution characteristics of nanosecond-pulsed surface dielectric barrier discharge at different electrode gaps[J].Transactions of China Electrotechnical Society,2017,32(2):33-42.
[13]高国强,彭开晟,董磊,等.电压幅值和频率对表面介质阻挡放电与气动特性的影响[J].电工技术学报,2017,32(8):55-62.Gao Guoqiang,Peng Kaisheng,Dong Lei,et al.Experimental of surface dielectric barrier discharge and aerodynamic characteristics at different voltage amplitude and frequency[J].Transactions of China Electrotechnical Society,2017,32(8):55-62.
[14]戴栋,张雨晖,宁文军.大气压氦气辉光放电中正柱区消散特性对时域非线性行为的影响[J].高电压技术,2017,43(6):1766-1774.Dai Dong,Zhang Yuhui,Ning Wenjun.Influence of positive column dissipation characteristics on temporal nonlinear phenomena in atmosphere helium glow discharges[J].High Voltage Engineering,2017,43(6):1766-1774.
[15]刘勇,何湘宁,马飞.介质阻挡放电和大气压辉光放电的分析和仿真[J].高电压技术,2005,31(6):55-58.Liu Yong,He Xiangning,Ma Fei.Analysis and simulation of dielectric barrier discharge and atmospheric pressure glow discharge[J].High Voltage Engineering,2005,31(6):55-58.
[16]Zhang Jiao,Wang Yanhui,Wang Dezhen.Nonlinear behaviors in a pulsed dielectric barrier discharge at atmospheric pressure[J].Thin Solid Films,2011,519(20):7020-7024.
[17]Shi Hong,Wang Yanhui,Wang Dezhen.Nonlinear behavior in the time domain in argon atmospheric dielectric-barrier discharges[J].Physics of Plasmas,2008,15(12):122306.
[18]Yan Ha,Wang Huijuan,Wang Xiaofei.Modeling of asymmetric pulsed phenomena in dielectric-barrier atmospheric-pressure glow discharges[J].Physics of Plasmas,2012,19(1):057103.
[19]Wang Dezhen,Wang Yanhui,Liu Chengsen.Multipeak behavior and mode transition of a homogeneous barrier discharge in atmospheric pressure helium[J].Thin Solid Films,2006,506-507:384-388.
[20]郝艳捧,王晓蕾,阳林.大气压氦气介质阻挡多脉冲辉光放电的形成条件[J].电工技术学报,2009,24(9):28-32.Hao Yanpeng,Wang Xiaolei,Yang Lin.Formation of dielectric barrier multi-pulse glow discharges in helium at atmospheric pressure[J].Transactions of China Electrotechnical Society,2009,24(9):28-32.
[21]王艳辉,王德真.大气压下多脉冲均匀介质阻挡放电的研究[J].物理学报,2005,54(3):1295-1300.Wang Yanhui,Wang Dezhen.Study on homogeneous multiple-pulse barrier discharge at atmospheric pressure[J].Acta Physica Sinica,2005,54(3):1295-1300.
[22]Hagelaar G,Pitchford L.Solving the Boltzman equation to obtain electron transport coefficients and rate coefficients for fluid models[J].Plasma Sources Science and Technology,2005,14(4):722-733.
[23]Lazarou C,Belmonte T,Chiper A S,et al.Numerical modelling of the effect of dry air traces in a helium parallel plate dielectric barrier discharge[J].Plasma Sources Science&Technology,2016,25(5):055023.
[24]宁文军,戴栋,张雨晖,等.短间隙大气压氦气介质阻挡放电中非线性现象的1维流体仿真[J].高电压技术,2017,43(6):1845-1853.Ning Wenjun,Dai Dong,Zhang Yuhui,et al.Study on the nonlinear phenomena in a short-gap atmospheric helium dielectric barrier discharge with one dimensional fluid model[J].High Voltage Engineering,2017,43(6):1845-1853.
[25]Walsh J L,Janson N B,Iza F,et al.Chaos in atmospheric-pressure plasma jets[J].Plasma Sources Science&Technology,2012,21(3):034008.