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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >The role of photoionization in positive streamer dynamics
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The role of photoionization in positive streamer dynamics

机译：光电离在正拖缆动力学中的作用

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The results of two-dimensional modelling of positive streamer dynamics in 2 cm point-to-plane gap are presented, including the process of photoionization in a gas volume. The model of photoionization in air, developed by Zhelezniak, Mnatsakanian and Sizykh is considered in detail and a comparison with the experimental data of Penney and Hummert is presented. The model of photoionization in nitrogen, based on the data of Penney and Hummert is described. The simulations of streamers were performed for air and nitrogen-like gas. it is shown, that fundamental space scale of streamer-the width of space charge layer l(rho) (ionization domain) around its head is defined by the length of absorption of photoionizing radiation l(alpha). This length defines all other parameters. electron density, radius of streamer channel etc, so one may speak about standard streamer in air, whose properties depend only on pressure. Based on simulation results one may assume that streamer branching occurs in high field, when l(rho) exceeds l(alpha). The process of branching may be interpreted as an instability which transforms the non-standard streamer into a number of standard ones. [References: 22]
机译：提出了在2 cm的点对面间隙中正拖缆动力学的二维建模结果，包括气体体积中的光电离过程。详细讨论了由Zhelezniak，Mnatsakanian和Sizykh开发的空气中光电离模型，并与Penney和Hummert的实验数据进行了比较。基于Penney和Hummert的数据，描述了氮中的光电离模型。飘带的模拟是针对空气和类氮气体进行的。如图所示，流束的基本空间尺度-围绕其头部的空间电荷层l（rho）（电离域）的宽度由光电离辐射lα的吸收长度来定义。该长度定义了所有其他参数。电子密度，流光通道的半径等，因此人们可以说空气中的标准流光，其特性仅取决于压力。基于仿真结果，可以假设当l（rho）超过lα时，流线分支发生在高场中。分支过程可以解释为将非标准拖缆转换成许多标准拖缆的不稳定性。 [参考：22]

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