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Fluid modeling of radical species generation mechanism in dense methane-air mixture streamer discharge

机译：茂密甲烷 - 空气混合物流飘带排出中自由基物种产生机制的流体建模

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摘要

Atmospheric dielectric barrier discharge (DBD) was found to be promising in the context of plasma chemistry, plasma medicine, and plasma-assisted combustion. In this paper, we present a detailed fluid modeling study of abundant radical species produced by a positive streamer in atmospheric dense methane-air DBD. A two-dimensional axisymmetric fluid model is constructed, in which 82 plasma chemical reactions and 30 different species are considered. Spatial and temporal density distributions of dominant radicals and ions are presented. We lay our emphasis on the effect of varying relative permittivity (epsilon(r) = 2, 4.5, and 9) on the streamer dynamics in the plasma column, such as electric field behavior, production, and destruction pathways of dominant radical species. We find that higher relative permittivity promotes propagation of electric field and formation of conduction channel in the plasma column. The streamer discharge is sustained by the direct electron-impact ionization of methane molecule. Furthermore, the electron-impact dissociation of methane (c + CH4 = c + H + CH3) is found to be the dominant reaction pathway to produce CH3 and H radicals. Similarly, the electron-impact dissociations of oxygen (c + O-2 = c + O +O(D-1), c + O-2 = c + O + O) are the major routes for O production. Published by AIP Publishing.
机译：大气介质阻挡放电（DBD）被发现在等离子体化学，血浆药，和等离子体辅助燃烧的情况下是有前途。在本文中，我们提出了通过在大气密甲烷 - 空气DBD的正流光产生丰富的自由基物种的详细流体模拟研究。二维轴对称流体模型被构建，其中82等离子体的化学反应和30个不同的物种被认为。占主导地位的自由基和离子的时空密度分布呈现。我们躺在我们关于在等离子体柱，流动态产生不同的相对介电常数（ε-（R）= 2，4.5和9）的作用强调如电场行为，生产和优势自由基物种的破坏途径。我们发现，较高的相对介电常数促进电场和形成导电沟道中的传播在等离子体柱。流光放电是由甲烷分子的直接电子 - 冲击电离持续。另外，甲烷的电子碰撞离解（C + CH4 =＆以及c + H + CH 3）被发现是占主导地位的反应途径来产生CH3和H自由基。类似地，氧气的电子碰撞离解（C + O-2 =＆以及c + O + O（d-1），C + O-2 =＆以及c + O + O）是用于O-生产主要路线。通过AIP发布发布。

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  • 来源
    《Physics of plasmas》 |2018年第1期|共14页
  • 作者

    Qian Muyang; Li Gui; Kang Jinsong; Liu Sanqiu; Ren Chunsheng; Zhang Jialiang; Wang Dezhen;

  • 作者单位

    Nanchang Univ Dept Phys Nanchang 330031 Jiangxi Peoples R China;

    Nanchang Univ Dept Phys Nanchang 330031 Jiangxi Peoples R China;

    Nanchang Univ Dept Phys Nanchang 330031 Jiangxi Peoples R China;

    Nanchang Univ Dept Phys Nanchang 330031 Jiangxi Peoples R China;

    Dalian Univ Technol Sch Phys Dalian 116024 Peoples R China;

    Dalian Univ Technol Sch Phys Dalian 116024 Peoples R China;

    Dalian Univ Technol Sch Phys Dalian 116024 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
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