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首页> 外文期刊>Plasma Sources Science & Technology >Influence of surface parameters on dielectric-barrier discharges in argon at subatmospheric pressure
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Influence of surface parameters on dielectric-barrier discharges in argon at subatmospheric pressure

机译：表面参数对氩气压力介电屏障放电的影响

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摘要

The influence of the secondary electron emission coefficient, γ, and the relative permittivity, ε_r, of the dielectric layers on the characteristics of dielectric-barrier discharges (DBDs) is studied by means of numerical modelling and calculated results are compared with experimental data. The analysis has been performed for a geometrically symmetric, plane-parallel DBD in argon with copper electrodes covered by quartz dielectrics. A time-dependent, spatially one-dimensional fluid model involving the drift-diffusion approximation is applied for the numerical analysis of the DBD operating sinusoidally at a frequency of 24 kHz with applied voltages between 1.8 and 3.4 kV and pressures from 100 to 650 mbar. Main features of the model as well as the experimental setup and procedures are given. The modelling studies show especially the sensitivity of the results on the specific choice of γ and ε_r regarding the occurrence and intensity of discharge peaks, the appearance of one or more smaller peaks after the main peak, as well the establishment of a single periodic, multiperiodic or even chaotic temporal evolution of the DBD. In particular, generally good agreement between measured and calculated discharge current signals and the power dissipated in the discharge is found for γ = 0.02 and ε_r = 4.2.
机译：通过数值模拟研究了介质层的二次电子发射系数γ和相对介电常数εr对介质阻挡放电（DBD）特性的影响，并将计算结果与实验数据进行了比较。对一种几何对称、平面平行的氩气介质阻挡放电（DBD）进行了分析，其铜电极由石英电介质覆盖。采用了一个涉及漂移扩散近似的时间相关、空间一维流体模型，对DBD进行了数值分析，DBD以24 kHz的频率正弦运行，外加电压在1.8至3.4 kV之间，压力在100至650 mbar之间。给出了模型的主要特点、实验装置和程序。建模研究特别显示了结果对γ和εr的具体选择的敏感性，即放电峰的出现和强度，主峰后出现一个或多个较小的峰，以及DBD的单周期、多周期甚至混沌时间演化的建立。特别是，在γ=0.02和ε_r=4.2时，测量和计算的放电电流信号与放电中消耗的功率之间通常具有良好的一致性。

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