大气压氩气丝状介质阻挡放电中条纹的形成机制
Formation mechanisms of striations in a filamentary dielectric barrier discharge in atmospheric pressure argon
AI总结：
本研究采用二维流体-泊松模型探究大气压氩气单丝DBD中条纹的形成机制，发现条纹形成于瞬态辉光阶段，由亚稳态氩原子逐级电离和准分子电离导致载流子分布扰动引发，明确了激发态与逐级电离过程的关键作用。
摘要：
本研究采用含时空间二维流体-泊松模型，研究了大气压氩气中单丝介质阻挡放电（DBD，dielectric barrier discharge）通道沿程条纹的形成机制。该模型应用于间隙为1.5 mm的单侧DBD结构，在有源金属电极上施加正弦高压。所选放电条件模拟了已观测到条纹的实验条件。研究发现，条纹在流光击穿阶段之后的瞬态辉光阶段的两个半周期内均会形成。模拟结果表明，清晰的条纹结构具有带电粒子和激发态粒子密度的局域空间极大值与极小值，在正极性期间更为显著。其形成机制可解释为亚稳态氩原子的重复逐级电离和准分子电离，导致沿放电通道的载流子空间分布发生扰动。研究结果强调了激发态和逐级电离过程对重复电离波形成的重要性，这些过程最终导致放电通道沿程出现条纹。
英文摘要：
Formation mechanisms of striations along the discharge channel of a single-filament dielectric barrier discharge (DBD) in argon at atmospheric pressure are investigated by means of a time-dependent, spatially two-dimensional fluid-Poisson model. The model is applied to a one-sided DBD arrangement with a 1.5 mm gap using a sinusoidal high voltage at the powered metal electrode. The discharge conditions are chosen to mimic experimental conditions for which striations have been observed. It is found that the striations form in both half-periods during the transient glow phase, which follows the streamer breakdown phase. The modelling results show that the distinct striated structures feature local spatial maxima and minima in charged and excited particle densities, which are more pronounced during the positive polarity. Their formation is explained by a repetitive stepwise ionisation of metastable argon atoms and ionisation of excimers, causing a disturbance of the spatial distribution of charge carriers along the discharge channel. The results emphasise the importance of excited states and stepwise ionisation processes on the formation of repetitive ionisation waves, eventually leading to striations along the discharge channel.
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