Nanosecond repetitively pulsed discharges in air at atmospheric pressure—the glow regime
Nanosecond repetitively pulsed discharges in air at atmospheric pressure—the glow regime
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DOI：
10.1088/0963-0252/18/4/045030
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发表时间：
2009-11
影响因子：
3.8
通讯作者：
D. Pai;G. Stancu;D. Lacoste;C. Laux
中科院分区：
文献类型：
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作者：
D. Pai;G. Stancu;D. Lacoste;C. Laux
在预热到1000K的大气压空气中，纳秒重复脉冲(NRP)放电产生了三种等离子体放电模式。除了众所周知的电晕和火花机制外，还存在一个类似辉光的机制，它通过初始的阴极定向流光发展，随后是电位再分配的返回波。然后，在阴极下落形成之前，关闭施加的电场，导致即将发生的辉光放电。在此之前，只有在大气压下的2000K空气中才能观察到这种状态。测量了脉冲辉光区激发态物种N_2(B)、N_2(C)、N_2(A)和O(3p、5p)的等离子体动力学、电流-电压特性、气体温度和等离子体化学。在30 kHz重复施加10 ns脉冲的情况下，我们发现这种辉光机制产生的电子数密度估计为1013 cm−3，而每个脉冲仅消耗1-10微焦耳，并且加热气体不到200K。
In atmospheric-pressure air preheated to 1000 K, nanosecond repetitively pulsed (NRP) discharges are shown to generate three plasma discharge regimes. In addition to the well-known corona and spark regimes, there exists a glow-like regime that develops through an initial cathode-directed streamer, followed by a return wave of potential redistribution. The applied electric field is then switched off before the formation of the cathode fall, resulting in an ‘imminent’ glow discharge. Previously, this regime had been observed only at 2000 K in air at atmospheric pressure. Measurements of the plasma dynamics, current–voltage characteristics, gas temperature and plasma chemistry of the excited species N2(B), N2(C), , NO(A) and O(3p 5P) in the pulsed glow regime are presented. Using 10 ns pulses applied repetitively at 30 kHz, we find that this glow regime generates an estimated electron number density of 1013 cm−3, while consuming only 1–10 µJ per pulse and heating the gas by less than 200 K.