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两间隙毛细管等离子体发生器利用触发间隙放电产生等离子体射流连通主放电间隙,引发主放电形成高温等离子体射流。建立一个一维流体模型对两间隙毛细管触发放电进行模拟,对考虑管壁烧蚀和不考虑管壁烧蚀条件下的触发放电的特性进行计算,分析触发放电过程对主间隙击穿的影响。由于管壁烧蚀补充毛细管内由于开口端流出的质量损失,因此在放电期间毛细管内的气体压强、流速和温度基本保持稳定状态;管壁烧蚀降低了放电时毛细管内的气体温度,但加快了高温区向毛细管开口端的传播速度,因而缩短了主间隙的击穿时延。
Two-gap capillary plasma generator utilizes a gap-triggered discharge to generate a plasma jet that communicates with the main discharge gap, causing the main discharge to form a high-temperature plasma jet. A one-dimensional fluid model was established to simulate the two-gap capillary discharge. The characteristics of the two-gap capillary discharge were simulated, and the characteristics of the trigger discharge considering the wall ablation and without considering the wall ablation were calculated. The effect of the trigger discharge on the main gap breakdown was analyzed. The gas pressure, flow rate and temperature in the capillaries remained stable during the discharge due to the mass loss of the capillary due to the wall ablation in the capillary due to the mass loss from the open end. The tube wall ablation reduced the gas temperature in the capillaries during discharge but accelerated The propagation velocity of the high temperature region toward the open end of the capillary tube shortens the breakdown time of the main gap.