NEUTRAL HEATING IN GLOW TO SPARK TRANSITION IN AIR AND NITROGEN

被引:31
作者
BAYLE, P
BAYLE, M
FORN, G
机构
[1] Univ Paul Sabatier, Toulouse, Fr, Univ Paul Sabatier, Toulouse, Fr
关键词
AIR - ELECTRIC SPARKS - HYDRODYNAMICS - NITROGEN;
D O I
10.1088/0022-3727/18/12/010
中图分类号
O59 [应用物理学];
学科分类号
摘要
The heating of the neutral molecules in the glow to spark transition in air and nitrogen has been theoretically studied. A hydrodynamic first-order model has been used for electrons (density, momentum) and a second-order model (density, momentum, temperature) for neutral molecules. The interaction between the electron dynamics and the neutral dynamics has been compared in two kinds of discharges: a fast discharge (170 ns) in an overvolted plane parallel gap in nitrogen, and a discharge of long duration (1. 15 mu s) in a positive point-to-plane gap in air. The gas heating gives rise to a neutral depopulation in the core of the discharge. This leads to an increase of the reduced electric field E/N, thus to an increase of the electron production and thus of the current. In this kind of discharge, the heterogeneity of the neutral gas leads to the breakdown, owing to a constriction of the current core induced by the depopulation mechanisms.
引用
收藏
页码:2395 / 2415
页数:21
相关论文
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