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爆炸对自然磁场干扰机理

栗建桥 马天宝 宁建国

栗建桥, 马天宝, 宁建国. 爆炸对自然磁场干扰机理[J]. 力学学报, 2018, 50(5): 1206-1218. doi: 10.6052/0459-1879-18-081
引用本文: 栗建桥, 马天宝, 宁建国. 爆炸对自然磁场干扰机理[J]. 力学学报, 2018, 50(5): 1206-1218. doi: 10.6052/0459-1879-18-081
Li Jianqiao, Ma Tianbao, Ning Jianguo. MECHANISM OF EXPLOSION-INDUCED DISTURBANCE IN NATURAL MAGNETIC FIELD[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(5): 1206-1218. doi: 10.6052/0459-1879-18-081
Citation: Li Jianqiao, Ma Tianbao, Ning Jianguo. MECHANISM OF EXPLOSION-INDUCED DISTURBANCE IN NATURAL MAGNETIC FIELD[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(5): 1206-1218. doi: 10.6052/0459-1879-18-081

爆炸对自然磁场干扰机理

doi: 10.6052/0459-1879-18-081
基金项目: 1)国家自然科学基金资助项目(11772061, 11521062).
详细信息
    作者简介:

    2)宁建国, 教授, 主要研究方向: 爆炸力学, 冲击动力学. E-mail: jgning@bit.edu.cn

    通讯作者:

    宁建国

  • 中图分类号: O383+.1,P318.1,O361.3;

MECHANISM OF EXPLOSION-INDUCED DISTURBANCE IN NATURAL MAGNETIC FIELD

  • 摘要: 爆炸产生的电磁场对爆炸测试有较明显的干扰, 一些含金属炸药产生的电磁干扰甚至可以使设备失效, 为了给出爆炸产生电磁效应的理论分析方法和特性, 针对常规炸药爆炸过程中观察到的自然磁场扰动现象进行理论机理和数值模拟研究. 采用热平衡电离理论描述爆炸过程中产生的电离气体, 结合爆炸问题的数值模拟方法, 获得爆炸场中电导率的时空分布, 计算磁场扩散率; 基于非理想全磁流体力学方程求解一定磁扩散率下等离子体高速运动引起的自然磁场扰动, 实现爆炸产生磁场效应的二维模拟; 对比炸药不同起爆条件对产生磁场扰动的影响, 结果表明: 炸药起爆参数对磁场扰动有很大的影响, 这种影响源自于电导率的巨大差异, 虽然爆轰产物的高速运动有引起磁场大幅度扰动的能力, 然而只有具有一定电导率的爆轰气体才能冻结磁场扰动. 数值模拟结果与文献中的结果进行了对比, 模拟得到的由电磁波引起的磁场扰动在时间尺度上与文献结果符合较好, 从一定程度上证明了数值模拟方法的可靠性. 本文的数值模拟结果指出炸药几何构型不对称的时候, 在自然磁场取不同方向时将会产生不同的磁场扰动强度, 而这是目前该领域中尚且无人关注和讨论过的问题.

     

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出版历程
  • 收稿日期:  2018-03-19
  • 刊出日期:  2018-09-18

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