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闪电等离子体通道半径及特性参数沿径向的演变

2020-12-10阅读(197)

闪电等离子体通道半径及特性参数沿径向的演变

论文摘要

利用高速摄谱仪在青海记录的六次地闪过程的光谱资料,依据光谱的不同辐射成分,诊断得到闪电等离子体通道的温度;结合与闪电同步的地面电场变化信息和通道的光学图片、以及闪电光谱辐射强度与通道半径的相关性,得到了闪电外围发光通道和核心电流通道的半径。研究发现,不同闪电的光谱轮廓和谱线结构存在一定差异。闪电外围发光通道和核心电流通道的半径分别在5.03-7.96cm和0.66-1.01cm的范围,均在文献报道范围之内,相对应的通道温度分别在27300-30300和3300-5800K的范围。在此基础上,根据热传导方程和能量守恒,获得了温度沿闪电等离子体通道径向的分布,并首次得到了通道发光边缘（500K）的半径。结果表明:温度沿通道径向按对数规律衰减。在半径约13cm内,温度从峰值30000K左右降到300K。20000K以上高温通道半径低于2cm,这一范围内,温度梯度比较大,沿径向急剧下降,随后逐渐降低。通道发光边缘的半径在6.94-13.0cm的范围。依据空气等离子体的电导率是温度的函数,估算了放电等离子体通道的电导率,并首次得到了电导率沿通道径向的分布。结果表明:电导率随半径的衰减规律与温度的类似,都是随着半径的增大,衰减逐渐变缓。半径约在4.6cm内,电导率沿半径的增大而急剧衰减,符合对数衰减规律,电导率从20000Sm-1减为500Sm-1。其中,在半径约2.00cm的通道内,电导率均在104Sm-1量级。半径大于4.6cm后,电导率衰减变缓,沿径向呈指数规律衰减。通道半径约在9.7cm左右,电导率衰减为10-7Sm-1左右,相应温度在1500K左右;对应温度为500K的发光边缘的电导率为10-14Sm-1,与纯净空气电导率的数量级相同。

论文目录

  • 摘要
  • Abstract
  • 第一章 绪论
  •   1.1 研究背景
  •     1.1.1 研究意义
  •     1.1.2 研究现状
  •   1.2 闪电综述
  •     1.2.1 闪电分类
  •     1.2.2 云-地闪放电过程
  •   1.3 本工作的主要内容
  •   参考文献
  • 第二章 理论方法和实验设备
  •   2.1 云-地闪电放电的主要特征
  •   2.2 理论方法
  •     2.2.1 闪电等离子体的温度诊断
  •     2.2.2 放电通道的电导率
  •     2.2.3 闪电通道的半径
  •     2.2.4 闪电等离子体通道径向的热量传输
  •   2.3 实验设备
  •     2.3.1 光学观测设备
  •     2.3.2 光谱观测设备
  •     2.3.3 电学观测设备
  •   参考文献
  • 第三章 闪电等离子体通道半径
  •   3.1 引言
  •   3.2 资料分析
  •     3.2.1 闪电等离子体通道温度
  •     3.2.2 闪电等离子体通道半径
  •   3.3 结论
  •   参考文献
  • 第四章 闪电等离子体通道温度及电导率沿径向的分布
  •   4.1 引言
  •   4.2 资料分析
  •     4.2.1 温度沿闪电等离子体通道径向的分布
  •     4.2.2 电导率沿闪电等离子体通道径向的分布
  •   4.3 结论
  •   参考文献
  • 第五章 总结与展望
  •   5.1 主要结论
  •   5.2 工作展望
  • 攻读硕士期间发表和完成的工作
  • 参加的学术交流活动
  • 致谢

    • 文章来源

    类型: 硕士论文

    作者: 安婷婷

    导师: 袁萍

    关键词: 闪电等离子体通道,回击,半径,温度分布,电导率分布

    来源: 西北师范大学

    年度: 2019

    分类: 基础科学

    专业: 物理学,气象学

    单位: 西北师范大学

    基金: 国家自然科学基金(11475139和11605108)

    分类号: O53;P427.3

    总页数: 63

    文件大小: 3214K

    下载量: 53

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    闪电等离子体通道半径及特性参数沿径向的演变
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