The role of photoionization in positive streamer dynamics
The role of photoionization in positive streamer dynamics
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DOI：
10.1088/0022-3727/33/12/314
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发表时间：
2000-06-21
影响因子：
3.4
通讯作者：
Kulikovsky, AA
中科院分区：
文献类型：
--
作者：
Kulikovsky, AA
提出了2 cm的平面间隙中正流动力学的二维模型的结果，包括气体体积中的光电离过程。详细考虑了由Zhelezniak，Mnatsakanian和Sizykh开发的空气中的光电离世模型，并提出了与Penney和Hummert的实验数据进行比较。描述了基于Penney和Hummert的数据，氮中光电离的模型。进行了彩带的模拟，以用于空气和氮状气体。据显示，彩流器的基本空间尺度 - 空间电荷层L（RHO）（电离域）的头部周围的宽度是由光电离辐射L（alpha）的吸收长度定义的。此长度定义了所有其他参数。电子密度，流媒体通道的半径等，因此可以谈论空气中的标准流媒体，其特性仅取决于压力。基于模拟结果，人们可以假设当L（Rho）超过L（alpha）时，流媒体分支发生在高场中。分支的过程可以解释为将非标准流媒体转化为许多标准的不稳定。
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.