Numerical Simulations of Trichel pulses in a negative corona in air

被引:45
作者
Akishev, YS [1 ]
Kochetov, IV [1 ]
Loboiko, AI [1 ]
Napartovich, AP [1 ]
机构
[1] State Sci ctr Russian Fed, Troitsk Inst Innovat & Fus Res, Troitsk 142190, Russia
关键词
D O I
10.1134/1.1528237
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Numerical simulations of a negative corona in air demonstrate that the experimentally observed regime of self-oscillations, known as Trichel pulses, is well described by a three-dimensional axisymmetric model that is based on the standard transport equations and in which only the ion-induced secondary electron emission at the cathode is taken into account. The quantitative difference between the measured and calculated values of the mean current and the pulse repetition rate most likely stems from the insufficiently large dimensions of the computation region and from the fact that the point shape adopted in simulations somewhat inexactly conforms to that used in experiments. It was found that the transverse discharge structure near the cathode radically changes during the pulse. Specifically, as the current grows, a cathode sheath forms at the discharge axis and expands over the cathode surface. When the current falls off, the cathode sheath is rapidly destroyed; as a result, the characteristic field structure is well defined only near the discharge axis and becomes virtually indistinguishable as the current decreases by an order of magnitude. (C) 2002 MAIL "Nauka/Interperiodica".
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收藏
页码:1049 / 1059
页数:11
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