Numerical simulation for production of O and N radicals in an atmospheric-pressure streamer discharge
Numerical simulation for production of O and N radicals in an atmospheric-pressure streamer discharge
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DOI：
10.1088/0022-3727/45/26/265201
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发表时间：
2012-07-04
影响因子：
3.4
通讯作者：
Oda, Tetsuji
中科院分区：
文献类型：
--
作者：
Komuro, Atsushi;Ono, Ryo;Oda, Tetsuji
建立了流光放电模型，分析了室温和大气压下充有氧氮混合气体的点对面电极中脉冲正流光放电的特性。在本文中，我们研究了大气压流光放电中 O 和 N 自由基产生的机制。为了证实仿真模型的有效性，将氧气浓度为 2-20% 的气体混合物中多个电压下的放电发射光和放电电流与实验数据进行了比较。计算出的条纹图像和流光发光强度的轴向分布与我们之前的实验结果非常吻合。在证明了模型的可靠性后，我们对流光放电产生的自由基进行了数值研究。我们的模拟成功地再现了实验获得的 O-2(20%)/N-2 中氧自由基产生量和 O-2(2%)/N-2 中氮自由基产生量的轴向分布。对于氮自由基的产生，通过振动激发态的两步解离是主要的。
A streamer discharge model is developed to analyse the characteristics of a pulsed positive streamer discharge in point-to-plane electrodes filled with oxygen-nitrogen mixed gas at room temperature and atmospheric pressure. In this paper we study the mechanisms of O and N radical production in an atmospheric-pressure streamer discharge. To confirm the validity of the simulation model, the discharge emission of light and the discharge current are compared with experimental data at several voltages in gas mixtures with 2-20% oxygen concentrations. The calculated streak picture and the axial distribution of streamer luminous intensity are in good agreement with our previous experimental results. After demonstrating the reliability of the model, we performed a numerical study on radical production by the streamer discharge. The experimentally obtained axial distributions of oxygen radical production in O-2(20%)/N-2 and nitrogen radical production in O-2(2%)/N-2 are successfully reproduced in our simulation. For the production of nitrogen radicals, two-step dissociation through the vibrationally excited states is predominant.