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二维对称结构纳秒脉冲介质阻挡放电数值模拟

DOI: 10.13336/j.1003-6520.hve.2015.06.045, PP. 2100-2107

Keywords: 纳秒脉冲,表面介质阻挡放电,平行电极,鞘层,电子密度,平均电子能量

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Abstract:

为具体分析放电过程中电场强度、电子密度、平均电子能量及鞘层的变化规律,通过简化化学反应动力学模型以及采用全时域漂移–扩散模型方程,对N2-O2混合气体的二维平行电极纳秒脉冲介质阻挡等离子体放电的发展演化过程进行数值模拟。计算结果发现放电从电极处开始发展形成约化场强约为5×10-19V?m2的强电场,高电压电极附近形成0.2mm的鞘层区域,鞘层边缘存在数密度为1.6×1019m-3的薄电子层,且其边缘分层结构与低气压辉光放电鞘层分层结构一致;电子沉积在介质表面,等离子体从强电场中获得的能量使得其在脉冲结束后的余辉过程中继续维持,进而有效地将能量耦合给等离子体。数值模拟结果表明,提出的简化化学反应动力学模型能够有效地模拟复杂的介质阻挡纳秒脉冲放电的物理过程及其各个物理参数的变化规律。

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