非对称条纹电极介质阻挡放电中放电特性的空间分布

Spatial distribution of the discharge characteristics in dielectric barrier discharge with asymmetric stripe electrode

本工作设计了由横条纹水电极和竖条纹水电极组成的非对称介质阻挡放电装置,所产生的电场强度在放电气隙各个截面的分布不同,具有S4点群对称性.实验采用光电倍增管(PMT)和高速照相机(ICCD)对放电时空特性进行了测量,研究了上述电场对放电特性的影响.结果表明:在放电气隙中部,由光信号积分估计的电荷产生量ΔQ最少,放电通道也最细.结果表明:在放电气隙中部,光信号时间积分值最小,放电通道最细.采用ICCD对单个放电丝在多个外加电压周期的空间分布进行了研究,发现其在靠近电极处的空间位置分布与电场分布一致.数值求解拉普拉斯方程模拟了该装置产生的外加电场,发现外加电场强度在气隙中各个截面的分布呈现如下连续变化:自一侧电极横向条纹分布演变至中部四边形阵列分布,最后至另一侧电极竖向条纹分布,具有S4点群对称性.综合上述实验及电场模拟结果,发现非对称介质阻挡放电中放电的空间特性与电场强度的空间分布有关.

In this paper,an asymmetric dielectric barrier discharge device with horizontal and vertical stripe water electrodes is designed.The electric field generated by this device exhibits different distributions at different sections of the discharge gap,which has S4 point group symmetry.The influence of this electric field on the discharge characteristics is examined by estimating the spatiotemporal characteristics of the discharge using a photomultiplier tube and an intensified chargecoupled device(ICCD).The findings revealed that the amount of charge ΔQ estimated by the optical signal integration is the least,and the discharge channel is the thinnest in the midplane of the discharge gap.The spatial distribution by a single discharge filament for several applied voltage periods is explored using ICCD.The spatial position distribution of the filament near the electrode is consistent with the electric field distribution.The applied electric field produced by the asymmetric dielectric barrier discharge device was numerically simulated by solving the Laplace equation.The spatial distribution of the electric field intensity generated by the device at different sections of the gas gap changes with distance away from the electrode.It evolves from the horizontal stripe distribution near one electrode to the square array distribution at the midplane of the gas gap and finally to the vertical stripe distribution near the other electrode,which has S4 point symmetry.The above experimental and simulated results reveal that the spatial characteristics of the discharge produced by the asymmetric dielectric barrier discharge device are related to the spatial distribution of the electric field intensity.