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纳秒脉冲激励下大气压空气弥散放电电流特性的实验研究

DOI: 10.13334/j.0258-8013.pcsee.2015.16.031, PP. 4263-4270

Keywords: 弥散放电,非热平衡等离子体,纳秒脉冲,传导电流,位移电流

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Abstract:

在常温常压的大气压条件下,采用重复频率高压纳秒陡度脉冲和线型电极产生了大面积的弥散放电等离子体。通过实验,对弥散放电及其电流特性进行了研究,分析表明,弥散放电电流由传导电流分量和位移电流分量合成而成。其特征波形为,在电压波峰附近对应着多个电流振荡尖峰,在波尾阶段传导电流分量会逐渐补偿位移电流分量,合成电流幅值很小。弥散放电向电弧或火花放电转化伴随着传导电流密度的增大,反之亦如此。长导线和大间距有利于长波尾脉冲产生均匀弥散放电等离子体。对大气压空气下弥散放电的产生机制进行了分析,高场强区引发下的大面积低场强电离可能是弥散放电形成的关键。

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