Gas density in a pulsed positive streamer measured using laser shadowgraph
Gas density in a pulsed positive streamer measured using laser shadowgraph
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DOI：
10.1088/0022-3727/43/34/345203
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发表时间：
2010-09
期刊：
影响因子：
--
通讯作者：
R. Ono;Y. Teramoto;T. Oda
中科院分区：
文献类型：
--
作者：
R. Ono;Y. Teramoto;T. Oda
用激光阴影法定量测量了脉冲正流光中的气体密度。放电发生在潮湿空气中13 mm的点-面间隙中。在流光开始之后，气体密度分两步减小。第一步是气体密度的快速降低，这是由于电子撞击分子而导致的气体加热引起的。该台阶在距阳极1 mm内是显著的，尽管其发生在整个差距中。第二步是在流光脉冲之后气体密度的逐渐减小，这是由于振动-平移能量转移引起的气体加热引起的。该步骤主要发生在次级拖缆通道中，而不是发生在初级拖缆通道中。当放电电压为32 kV时，气体密度的降低达到环境密度的30%。这种气体密度的大幅下降影响了后放电期间各种化学反应的速率。
Gas density in a pulsed positive streamer is quantitatively measured using a laser shadowgraph. The discharge occurs in a point–plane gap of 13 mm in humid air. After the onset of the streamer, the gas density decreases in two steps. The first step is a rapid decrease in gas density, which is caused by gas heating owing to electron impact onto molecules. This step is significant within 1 mm from the anode, although it occurs throughout the gap. The second step is a gradual decrease in gas density after the streamer pulse, which is caused by gas heating due to vibration-to-translation energy transfer. This step takes place mainly in the secondary streamer channel, not in the primary streamer channel. When the discharge voltage is 32 kV, the decrease in gas density reaches 30% of the ambient density. This large decrease in gas density affects the rate of various chemical reactions in the postdischarge period.