Mode transition and plasma characteristics of nanosecond pulse gas–liquid discharge: Effect of grounding configuration,Plasma Processes and Polymers

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Mode transition and plasma characteristics of nanosecond pulse gas–liquid discharge: Effect of grounding configuration
Plasma Processes and Polymers ( IF 2.9 ) Pub Date : 2019-11-08 , DOI: 10.1002/ppap.201900146
Sen Wang ₁ , De‐Zheng Yang ₂ , Rusen Zhou ₃ , Renwu Zhou ₃ , Zhi Fang ₁ , Wenchun Wang ₂ , Kostya (Ken) Ostrikov ₃

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Transitions between the streamer and spark modes affect the stability of gas–liquid discharges, limiting their practical applications, while the nature of such transitions is poorly understood. Here we clarify the often neglected effect of a dielectric on the gas–liquid discharge stability, using direct and indirect grounding configurations. Discharge modes and plasma characteristics in these two configurations are investigated. The discharge appears in a transient spark mode in the direct grounding while in a streamer mode in the indirect case. It is shown that the dielectric significantly improves the discharge stability. The gas temperature and electron density in the transient spark are 380 K and 1017/cm3 with a 30 kV pulse voltage, respectively, which are higher than those in the streamer mode.

中文翻译：

纳秒脉冲气液放电的模式转换和等离子体特性：接地配置的影响

流光和火花模式之间的转换会影响气液放电的稳定性，限制了它们的实际应用，而这种转换的性质却知之甚少。在这里，我们使用直接和间接接地配置阐明了电介质对气液放电稳定性的经常被忽视的影响。研究了这两种配置中的放电模式和等离子体特性。放电在直接接地时以瞬态火花模式出现，而在间接情况下以流光模式出现。结果表明，电介质显着提高了放电稳定性。瞬态火花中的气体温度和电子密度分别为380 K和1017/cm3，脉冲电压为30 kV，高于流光模式。

更新日期：2019-11-08

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