Correlation of axial and radial breakdown dynamics in dielectric barrier discharges
Correlation of axial and radial breakdown dynamics in dielectric barrier discharges
复制标题
介质阻挡放电中轴向和径向击穿动力学的相关性
DOI：
10.1088/1361-6595/aab39d
复制
发表时间：
2018
影响因子：
3.8
通讯作者：
M. Kettlitz
中科院分区：
文献类型：
--
作者：
H. Höft;M. Becker;M. Kettlitz
以高空间和时间分辨率进行了0.1vol%O2/N2气体混合物中单丝介质阻挡放电（DBDs）的实验研究。对于第一次，轴向和径向的动态和电特性的DBDs被记录的放电发射结合同步，快速的电气测量的高分辨率成像。研究了正流注的轴向传播和放电通道的径向扩展，并将它们关联起来。径向动力学的分析允许的流光传播和通道形成过程中的瞬态辉光阶段的分离。有人发现，放电通道变宽时，流光击中阴极表面和流光的直径和径向膨胀速度的增加而增加的轴向传播速度。轴向和径向拖缆动态的同步量化允许估计拖缆头部的电场。此外，时间分辨的电流密度是通过将电流测量与流光和辉光阶段期间径向放电发展的快速成像相结合来确定的。
Experimental studies of single-filament dielectric barrier discharges (DBDs) in a 0.1 vol% O2 in N2 gas mixture were performed with high spatial and temporal resolution. For the first time, the axial and radial dynamics and electrical characteristics of the DBDs were recorded by high-resolution imaging of the discharge emission combined with synchronised, fast electrical measurements. The axial propagation of the positive streamer and the radial expansion of the discharge channel were studied and correlated to each other. The analysis of the radial dynamics allowed the separation of the streamer propagation and the transient glow phase during channel formation. It was found that the discharge channel widens when the streamer hits the cathode surface and that both the diameter and the radial expansion velocities of the streamer increase with increasing axial propagation velocity. The synchronised quantification of the axial and radial streamer dynamics allowed the estimation of the electric field in the streamer head. Additionally, the time-resolved current density was determined by combining current measurements with fast imaging of the radial discharge development during streamer and glow phase.