Study on the residual gaseous filament of microsecond pulsed positive streamer discharge in water
Study on the residual gaseous filament of microsecond pulsed positive streamer discharge in water
复制标题
水中微秒脉冲正流光放电残余气态丝研究
DOI：
10.1063/5.0030883
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发表时间：
2021-01
影响因子：
2.2
通讯作者：
Yang Yuantian
中科院分区：
文献类型：
--
作者：
Wen Xiaoqiong;Zhou Yibing;Xue Xiaodong;Yang Yuantian
水中流注放电后的残留气丝包含着与流注传播密切相关的丰富信息。利用阴影成像技术研究了水中微秒级脉冲正流光放电的残余气丝。基于获得的阴影图像，我们测量了平均气体密度、平均半径和残余气体细丝的平均长度。结果表明，随着水电导率从20 μS/cm增加到476 μS/cm，平均气体密度从883 kg/m3减小到610 kg/m3，而平均气体密度随外加电压的变化不明显。在流光灯丝的单位长度中产生的气体量和在流光灯丝中产生单位质量气体所消耗的能量也不依赖于所施加的电压，而是随着水电导率的增加而增加。在我们的实验中，在流光灯丝中产生单位质量的气体所消耗的能量远小于液态水的汽化潜热，这表明在放电期间在流光灯丝中产生的气体不太可能通过加热过程产生。
The residual gaseous filament soon after a streamer discharge in water contains a wealth of information closely related to the streamer propagation. We have investigated the residual gaseous filament of microsecond pulsed positive streamer discharge in water by using a shadowgraph imaging technique. Based on the obtained shadow images, we measured the average gas density, the average radius, and the average length of the residual gaseous filament. We found that the average gas density has no significant dependence on the applied voltage, but decreases from 883 to 610 kg/m3 as the water conductivity increases from 20 to 476 μS/cm. The amount of gas produced in a unit length of the streamer filament and the energy consumed for producing a unit mass of gas in the streamer filament also have no dependence on the applied voltage, but increase as the water conductivity increases. In our experiments, the energy consumed for producing a unit mass of gas in the streamer filament is far smaller than the latent heat of vaporization of liquid water, indicating that the gas produced in the streamer filament during the discharge is unlikely produced through a heating process.
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