Velocity of initial propagation of positive nanosecond discharge in liquid water: dependence on high voltage amplitude and water conductivity
Velocity of initial propagation of positive nanosecond discharge in liquid water: dependence on high voltage amplitude and water conductivity
复制标题
液态水中正纳秒放电的初始传播速度：取决于高电压幅度和水电导率
DOI：
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发表时间：
2019
影响因子：
3.8
通讯作者：
P. Lukeš
中科院分区：
文献类型：
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作者：
B. Pongrác;M. Šimek;P. Ondáč;M. Člupek;V. Babický;P. Lukeš
研究了水电导率和高压脉冲幅度对液态水纳秒放电初速度的影响。作为可变参数，我们使用了三种不同电导率（2 μS cm−1、100 μS cm−1、500 μS cm−1）的水溶液和四种不同振幅（80 kV、91 kV、100 kV、113 kV）的正高压脉冲。放电反应器由点到面几何形状的金属电极组成，两者都浸没在液态水中。放电产生的商业纳秒脉冲电源发生器与正高压脉冲的脉冲宽度（FWHM）为1.6ns和1.2.5ns的上升时间。ICCD的时间分辨成像显微镜与高时间分辨率（10ns）被用作一个合适的诊断工具的放电动态传播。结果表明，水电导率对放电视觉特性和行为的影响不显著，放电丝长度随电压幅值的增加而增加，在90 kV时达到最大值约1.8 mm。初始传播速度也取决于电压幅值，并随电压的增加而增加。水的电导率对传播速度的影响可以忽略不计。据我们所知，这篇论文是第一个洞察水电导率对纳秒放电在液态水中传播的影响的主题。
This study deals with the effect of water conductivity and high voltage pulse amplitude on the initial velocity of nanosecond discharge in liquid water. As variable parameters, we used water solutions with three different conductivities (2 μS cm−1, 100 μS cm−1, 500 μS cm−1), and positive high voltage pulses with four different amplitudes (80 kV, 91 kV, 100 kV, 113 kV). The discharge reactor consists of metallic electrodes in a point–to–plane geometry, both immersed in liquid water. The discharge was generated by a commercial nanosecond pulse power generator with positive HV pulses of ∼6 ns pulse duration (FWHM) and ∼2.5 ns rise time. ICCD time-resolved imaging microscopy with high temporal resolution (∼ns) was utilized as a suitable diagnostic tool for the discharge dynamic propagation. It can be concluded that the discharge visual characteristics and behaviour are not significantly influenced by water conductivity and the length of the filaments increases with the increasing voltage amplitude and reaches the maximum value of ∼1.8 mm for 90 kV. The initial propagation velocity also depends on the voltage amplitude and increases with the voltage. The effect of water conductivity on the propagation velocity is negligible. As far as we know, this paper is the first to bring insight into the topic of the effect of water conductivity on the nanosecond discharge propagation in liquid water.