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Effect of photoionisation on initial discharge in air under nanosecond pulse voltage
High Voltage ( IF 4.4 ) Pub Date : 2022-08-25 , DOI: 10.1049/hve2.12249
Yutai Li 1 , Yangyang Fu 1 , Zhigang Liu 1 , Handong Li 1 , Peng Wang 1 , Haiyun Luo 1 , Xiaobing Zou 1 , Xinxin Wang 1
Affiliation  

Effects of photoionisation on the development and electron runaway of the initial discharge in atmospheric air under nanosecond pulse voltage were studied via two-dimensional particle-in-cell/Monte Carlo collision simulations. It was found that photoionisation has little effect at the beginning of the initial discharge. However, as the discharge channel gradually develops towards the anode, photoionisation shows greater impacts on the morphology of discharge but has little influence on the velocity of discharge development. Photoionisation does not appear to have a decisive effect on the growth trend of the highest energy of runaway electrons, but it does affect the change rate of the highest energy and overall distribution of electron energy, resulting in a higher proportion of energetic electrons. The difference in the distributions of the electron energy between the two cases, with and without considering photoionisation, can be attributed to the impact of photoionisation on the discharge morphology, which in turn distorted the electric field. The spatial density distributions of the electrons produced by photoionisation further explained the differences. The authors’ results explicitly demonstrate the influence of photoionisation on the development and the electron runaway of the initial discharge under nanosecond pulse voltage, which provides more comprehensive knowledge for the atmospheric air gap nanosecond pulse discharge physics.

中文翻译:

纳秒脉冲电压下光电离对空气中初始放电的影响

通过二维细胞内粒子/蒙特卡罗碰撞模拟研究了光电离对纳秒脉冲电压下大气中初始放电的发展和电子失控的影响。发现光电离在初始放电开始时几乎没有影响。然而,随着放电通道逐渐向阳极发展,光电离对放电形态的影响较大,但对放电发展速度的影响很小。光电离似乎对失控电子最高能量的增长趋势没有决定性影响,但它确实影响了最高能量的变化率和电子能量的整体分布,导致高能电子比例更高。在考虑和不考虑光离子化的情况下,两种情况下电子能量分布的差异可归因于光离子化对放电形态的影响,这反过来又扭曲了电场。光电离产生的电子的空间密度分布进一步解释了差异。作者的研究结果明确地证明了光电离对纳秒脉冲电压下初始放电的发展和电子失控的影响,这为大气气隙纳秒脉冲放电物理学提供了更全面的知识。光电离产生的电子的空间密度分布进一步解释了差异。作者的研究结果明确地证明了光电离对纳秒脉冲电压下初始放电的发展和电子失控的影响,这为大气气隙纳秒脉冲放电物理学提供了更全面的知识。光电离产生的电子的空间密度分布进一步解释了差异。作者的研究结果明确地证明了光电离对纳秒脉冲电压下初始放电的发展和电子失控的影响,这为大气气隙纳秒脉冲放电物理学提供了更全面的知识。
更新日期:2022-08-25
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