Blast wave propagation in glow to spark transition in air
Blast wave propagation in glow to spark transition in air
复制标题
空气中辉光到火花转变过程中的爆炸波传播
DOI：
10.1088/0022-3727/18/12/011
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
G. Forn
中科院分区：
文献类型：
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作者：
P. Bayle;M. Bayle;G. Forn
本文从理论上研究了放电后爆炸波的形成和传播，导出了在空气中点-面正放电情况下，电子与中性粒子之间能量转移的最小速率，作者在前一篇文章中对此作了描述和数值分析。在这种类型的放电中，放电中的能量注入是随时间传播的。放电产生的冲击波是一组结构复杂的波。它们首先分开传播，然后合并成一个波。放电的核心在放电交叉后长时间保持扰动（即低中性密度和高温），因此构成了可能重复放电的特权路径。爆炸波的经典分析适用于能量注入在时间和空间上传播的实验情况。本文研究了注入能量对波的扩展半径的影响，并指出，从纹影记录中可以推导出辉光到火花跃迁中电子与中性粒子之间的最小能量转移率fmin。在所分析的实验中，能量转移率f大于20+或-6%。
The formation and propagation of post-discharge blast waves are studied theoretically and the minimum rate of energy transfer between electrons and neutral particles is deduced in the case of a positive point-to-plane discharge in air, described and numerically analysed in a previous paper by the authors. In this type of discharge, the injection of energy in the discharge is spread in time. The blast waves generated by the discharge constitute a set of waves with a complex structure. They first propagate separately, then merge in a single wave. The core of the discharge remains perturbed for a long time (i.e. low neutral densities and high temperatures) after the discharge crossing and thus constitutes a privileged path for possible recurring discharges. The classical analysis of blast waves was adapted to the experimental situation in which the energy injection is spread in time and space. The influence of the injected energy on the expansion radius of the wave has been studied and the authors show that the minimum rate of energy transfer fmin between electrons and neutral particles in the glow to spark transition can be deduced from the Schlieren records. In the experiments analysed, the rate of energy transfer f is greater than 20+or-6%.