Spark propagation mechanisms in ambient air at the surface of a charged dielectric. I: Experimental ― the main stages of the discharge
Spark propagation mechanisms in ambient air at the surface of a charged dielectric. I: Experimental ― the main stages of the discharge
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DOI：
10.1063/1.338806
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发表时间：
1987
影响因子：
3.2
通讯作者：
S. Larigaldie
中科院分区：
文献类型：
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作者：
S. Larigaldie
利用带电介质平板上产生的滑动放电，研究了常压环境空气中电离和热化通道(Ne≊1018 cm−3，T≊2.8×104K)的快速传播(v≊106ms−1)。对于约100千伏的表面电压，1米长的滑行火花沿着一条直线行驶，没有任何气体预电离。通过这种方式，可以对放电进行全面的诊断，包括电流和传播速度的测量、光发射的记录(电子图像转换器、光谱、利希滕贝格图)、火花通道的全息干涉测量以及电容式探头对瞬变电场的检测。各种测量从靠近火花的光纤设备同步进行。研究表明：(A)电子温度Te≊_2 eV远大于气体温度T_0<；1500K的预放电阶段；(B)瞬变放电阶段。
The fast propagation (v≊106 ms−1) of an ionized and thermalized channel (ne≊1018 cm−3, T≊2.8×104 K) is studied in ambient air at atmospheric pressure, using gliding discharges produced over a charged dielectric slab. For surface voltages of about 100 kV, 1‐m‐long gliding sparks follow a straight line without any preionization of the gas. In this way, the discharges can be investigated with full diagnostics, including measurements of the current and of the propagation velocity, recording of the light emission (electronic image converter, spectroscopy, Lichtenberg figures), holographic interferometry of the spark channels, and detection of transient electric fields by capacitive probes. The various measurements are synchronized from optical fiber devices located close to the sparks. The study shows that the thermalized spark channel is produced by the three following stages: (a) a predischarge stage where the electron temperature Te≊2 eV is much greater than the gas temperature T0<1500 K; (b) a transient ar...