Breakdown characteristics in pulsed-driven dielectric barrier discharges: influence of the pre-breakdown phase due to volume memory effects
Breakdown characteristics in pulsed-driven dielectric barrier discharges: influence of the pre-breakdown phase due to volume memory effects
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DOI：
10.1088/0022-3727/47/46/465206
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
H. Höft;M. Kettlitz;M. Becker;T. Hoder;Detlef Loffhagen;Ronny Brandenburg;K. Weltmann
中科院分区：
文献类型：
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作者：
H. Höft;M. Kettlitz;M. Becker;T. Hoder;Detlef Loffhagen;Ronny Brandenburg;K. Weltmann
采用快速光学和电学测量方法，研究了脉冲驱动介质阻挡放电（DBDs）在常压条件下，在0.1 vol% O2的N2气体混合物中有1mm间隙的双面介质阻挡放电击穿的前兆。根据脉冲宽度（随后dbd之间的暂停时间），观察到以下放电的四种不同击穿状态。通过系统地减小脉冲宽度，击穿特性可以从单一阴极定向传播（正流）转变为同时阴极和阳极定向传播（正和负流），并且在亚μs脉冲时间内完全不传播。在所有情况下，都观察到不同的前期时空发射结构。实验结果与随时间变化的一维流体模型计算结果进行了比较。模拟结果证实，不同的预电离条件，即由先前放电的剩余电子和离子在体积中产生相当高的空间电荷，是观察到的现象的原因。
The pre-phase of the breakdown of pulsed-driven dielectric barrier discharges (DBDs) was investigated by fast optical and electrical measurements on double-sided DBDs with a 1 mm gap in a gas mixture of 0.1 vol% O2 in N2 at atmospheric pressure. Depending on the pulse width (the pause time between subsequent DBDs), four different breakdown regimes of the following discharge were observed. By systematically reducing the pulse width, the breakdown characteristics could be changed from a single cathode-directed propagation (positive streamer) to simultaneous cathode- and anode-directed propagations (positive and negative streamer) and no propagation at all for sub-μs pulse times. For all cases, different spatio-temporal emission structures in the pre-phase were observed. The experimental results were compared with time-dependent, spatially one-dimensional fluid model calculations. The modelling results confirmed that different pre-ionisation conditions, i.e. considerably high space charges in the volume created by the residual electrons and ions from the previous discharge, are the reason for the observed phenomena.