Numerical simulation of nonthermal atmospheric pressure plasma jet and comparison with experiments

W. Ning, Lijun Wang, S. Jia, Mingzheng Fu, Z. Shi, Xingwen Li
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Abstract

Summary form only given. This paper presents a computational study of point-to-plane atmospheric helium plasma discharge. We employed a two-dimensional, axisymmetric fluid model to investigate the time-dependent characters of the discharge. Helium with small amount of nitrogen (impurity) was used as the working gas. The gap distance between the two electrodes was varied from 1mm to 15mm. The magnitude of the applied voltage's amplitude was in the range of 1kV∼10kV, and the frequency was 10 kHz. The coupled continuity equations for particles and electron energy equation were solved with the Poisson' equation using the finite element method with unstructured grids. Simulation results showed that the plasma needle operated as the corona discharge at low power and the mode transferred to glow discharge as the power surpassed certain critical value, and this value decreased either the frequency increased or the gap distance decreased. Furthermore, the simulation results were compared with the experimental results. The results showed that simulation results were in reasonable agreement with experiments.
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非热大气压等离子体射流的数值模拟与实验比较
只提供摘要形式。本文对大气氦等离子体点对面放电进行了计算研究。我们采用二维轴对称流体模型来研究放电的时变特性。工作气体采用氦和少量氮(杂质)。两个电极之间的间隙距离从1mm到15mm不等。施加电压的幅值范围为1kV ~ 10kV,频率为10khz。采用非结构网格有限元法,用泊松方程求解了粒子和电子能量的耦合连续性方程。仿真结果表明,等离子体针在低功率下以电晕放电方式工作,当功率超过某一临界值时模式转变为辉光放电,该临界值随着频率的增加或间隙距离的减小而减小。并将仿真结果与实验结果进行了比较。结果表明,仿真结果与实验结果吻合较好。
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