Experimental study of atmospheric pressure single-pulse nanosecond discharge in pin-to-pin configuration
Experimental study of atmospheric pressure single-pulse nanosecond discharge in pin-to-pin configuration
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DOI：
10.1063/5.0060252
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发表时间：
2021-06
影响因子：
3.2
通讯作者：
Xingxing Wang;Adam R. Patel;S. Bane;A. Shashurin
中科院分区：
文献类型：
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作者：
Xingxing Wang;Adam R. Patel;S. Bane;A. Shashurin
我们提出了一个纳秒高压放电的实验研究在一个引脚到引脚电极配置在大气条件下工作在单脉冲模式（无记忆效应）。放电参数测量使用微波瑞利散射，激光瑞利散射，光发射光谱增强纳秒探测脉冲，和快速摄影。火花和电晕放电制度进行了研究，电极间隙尺寸为2-10毫米，放电脉冲持续时间为90纳秒。对于< 6 mm的间隙，使用每mm差距长度0.6-1 mJ的放电脉冲能量观察火花状态。对于较小的电极间隙和较大的脉冲能量，观察到较高的电子数密度、每间隙长度的总电子数、放电电流和气体温度，对于2 mm间隙和1 mJ/mm放电脉冲能量，分别达到约7.5 × 10 cm、3.5 × 10电子/mm、22 A和4，000 K（在放电后10 μ s）的最大值。初始击穿之后是发生在约30-70 ns后的二次击穿，并且与阴极点的点燃和向阴极电弧的过渡相关联。大部分放电脉冲能量在二次击穿之前沉积到气体中（85-89%）。的ns放电脉冲后的电子数密度衰减的特征时间尺度为150 ns的解离复合和电子附着到氧的机制。对于电晕区，观察到显著较低的脉冲能量（~0.1 mJ/mm）、峰值传导电流（1-2 A）和电子数（3-5 × 10电子/mm）以及气体温度（360 K）。
We present an experimental study of nanosecond high-voltage discharges in a pin-to-pin electrode configuration at atmospheric conditions operating in single-pulse mode (no memory effects). Discharge parameters were measured using microwave Rayleigh scattering, laser Rayleigh scattering, optical emission spectroscopy enhanced with a nanosecond probing pulse, and fast photography. Spark and corona discharge regimes were studied for electrode gap sizes 2-10 mm and discharge pulse duration of 90 ns. The spark regime was observed for gaps < 6 mm using discharge pulse energies of 0.6-1 mJ per mm of the gap length. Higher electron number densities, total electron number per gap length, discharge currents, and gas temperatures were observed for smaller electrode gaps and larger pulse energies, reaching maximal values of about 7.510 cm, 3.510 electrons per mm, 22 A, and 4,000 K (at 10 s after the discharge), respectively, for a 2 mm gap and 1 mJ/mm discharge pulse energy. Initial breakdown was followed by a secondary breakdown occurring about 30-70 ns later and was associated with ignition of a cathode spot and transition to cathodic arc. A majority of the discharge pulse energy was deposited into the gas before the secondary breakdown (85-89%). The electron number density after the ns-discharge pulse decayed with a characteristic time scale of 150 ns governed by dissociative recombination and electron attachment to oxygen mechanisms. For the corona regime, substantially lower pulse energies (~0.1 mJ/mm), peak conduction current (1-2 A), and electron numbers (3-510 electrons per mm), and gas temperatures (360 K) were observed.