背景电离对等离子体点火动力学的影响

Y. Qiu, Y. Xian, Xinpei Lu, K. Ostrikov
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引用次数: 5

摘要

研究了背景电离对脉冲等离子体羽流点火动力学的影响。通过记录电压信号和发射光信号,研究了各脉冲的点火延迟时间。通过改变脉冲频率,揭示了脉冲熄灭时间与点火延迟时间之间的关系。这表明在前一次排放中产生的残留活性物质在下一次排放中起作用。随着频率的降低,滞燃时间和滞燃时间均增大。这是由于反应物质密度在脉冲发射时间内的衰减。这些物质浓度较低导致点火延迟时间较长。利用点火延迟时间的计算函数来解释残余物质对点火延迟时间的影响。每次放电的独立数据也证明了前一次脉冲的影响。前两个脉冲的点火延迟时间之间的奇特关系可能是由于在这项工作中使用的电极结构。对于针脚-平面电极结构,击穿过程中产生的活性物质积聚在阳极(针脚)周围,因为电场分布不对称,导致放电开始。
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Effect of background ionization on plasma ignition dynamics
The influence of background ionization on the ignition dynamics of the pulsed plasma plume is studied. The ignition delay time of each pulse is investigated by recording the voltage signal and the light emission signal. By changing the frequency, the relationship between the pulse-off time and the ignition delay time is revealed. This indicates that residual active species produced in the previous discharge play a role in the next one. With the decrease in the frequency, both time delay and ignition delay time increase. This is due to the decay of the reactive species densities in the pulse-off time. Lower concentrations of these species lead to a longer ignition delay time. The functions for calculating the ignition delay time are utilized to explain the effect of residual species. The independent data of each discharge also evidence the impact of the previous pulse. The exotic relationship between the ignition delay times of the first two pulses may be due to the electrode configuration used in this work. For a pin-to-plane electrode structure, the active species produced during the breakdown are accumulated around the anode (pin-point) where the discharge initiated for the asymmetrical electric field distribution.
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