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水下针-板放电气泡脉动及冲击特性

张思远 刘征 王志强 王进君 李国锋

张思远, 刘征, 王志强, 王进君, 李国锋. 水下针-板放电气泡脉动及冲击特性[J]. 爆炸与冲击. doi: 10.11883/bzycj-2021-0421
引用本文: 张思远, 刘征, 王志强, 王进君, 李国锋. 水下针-板放电气泡脉动及冲击特性[J]. 爆炸与冲击. doi: 10.11883/bzycj-2021-0421
ZHANG Siyuan, LIU Zheng, WANG Zhiqiang, WANG Jinjun, LI Guofeng. Underwater needle-plate electrical bubble pulsation and impact characteristics[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2021-0421
Citation: ZHANG Siyuan, LIU Zheng, WANG Zhiqiang, WANG Jinjun, LI Guofeng. Underwater needle-plate electrical bubble pulsation and impact characteristics[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2021-0421

水下针-板放电气泡脉动及冲击特性

doi: 10.11883/bzycj-2021-0421
基金项目: 国家自然科学基金青年科学基金(51607023)
详细信息
    作者简介:

    张思远(1996- ),男,硕士,1390853614@mail.dlut.edu.cn

    通讯作者:

    王志强(1983- ),男,博士,副教授,wangzq@dlut.edu.cn

  • 中图分类号: O389

Underwater needle-plate electrical bubble pulsation and impact characteristics

  • 摘要: 为明确水中脉冲放电能量释放过程所产生气泡的脉动和压力波冲击特性,本文依据能量等效原则,在LS-DYNA软件中建立针-板电极结构的水下爆轰模型,模拟气泡形态,通过与获取的物理图像比对,发现气泡形态和时间演化尺度高度一致。在此基础上,对气泡的冲击特性进一步分析,结果表明:冲击波峰值、气泡脉动周期和半径大小随放电能量增加而加大,随静水压力的增加而减小;当放电电压由14 kV增至20 kV,二次压力波峰值由2.89 MPa升至4.09 MPa,提高41.5%;当静水压力由202.65 kPa增至506.63 kPa,二次压力波峰值从5.15 MPa升至6.36 MPa,提高23.5%,放电能量和水压的增加对二次压力波提升明显;随着距离增加,二次压力波所占冲击波的峰值压力比重,由12.6%增加至35.3%,远场放电位置二次压力波不可忽视。
  • 图  1  水下气泡脉动及压力释放过程

    Figure  1.  Underwater bubble pulsation and pressure release process

    图  2  针-板式水下脉冲放电系统图

    Figure  2.  Needle-plate type underwater pulse discharge system diagram

    图  3  20.8 kV电压放电波形图

    Figure  3.  Voltage discharge waveform of 20.8 kV

    图  4  不同网格尺寸冲击波峰压随相对距离变化

    Figure  4.  Variation of shock wave peak pressure with relative distance for different grid sizes

    图  5  针-板式反应器结构尺寸图

    Figure  5.  Needle-plate reactor structure size diagram

    图  6  有限元模型

    Figure  6.  Finite element model

    图  7  针-板式电极放电气泡脉动实验和数值模拟结果对比

    Figure  7.  Comparison of experimental and simulation results of bubble pulsation of needle-plate electrode discharge

    图  8  实验与数值模拟的气泡半径时间演化曲线

    Figure  8.  Experimental and simulated bubble radius time evolution curves

    图  9  气泡半径随时间变化曲线

    Figure  9.  Variation curve of bubble radius with time

    图  10  气泡脉动、收缩速度曲线

    Figure  10.  Bubble pulsation, shrinkage speed curve

    图  11  水中压力分布云图

    Figure  11.  Cloud map of pressure distribution in water

    图  12  刚性底座垂向冲击波压力曲线图

    Figure  12.  Rigid base vertical shock wave pressure curve

    图  13  峰值压力随距离变化曲线

    Figure  13.  Peak pressure variation curve with distance

    图  14  气泡最大半径边界处压力曲线

    Figure  14.  Pressure curve at the level of 3cm from the source of the explosion

    表  1  不同电压等级下注入效率

    Table  1.   Injection efficiency at different voltage levels

    电压/kV总能量/J有效能量/J注入效率
    16.3106.319.518.3%
    16.9114.216.214.2%
    17.9128.218.014.0%
    19.1145.923.115.8%
    19.9158.425.416.1%
    20.8173.126.015.0%
    下载: 导出CSV

    表  2  TNT炸药状态方程参数设置

    Table  2.   TNT explosive equation of state parameter setting

    材料ρ/(g·cm−3)D/(m·s−1)E0/(J·g−1)PCJ /GPaA/GPaB/GPaR1R2ω
    TNT1.636930800021371.23.2314.150.950.3
    下载: 导出CSV

    表  3  水状态方程参数设置

    Table  3.   Water state equation parameter setting

    材料ρ/(g·cm−3)C/(m·s−1)E0/(J·kg−1)S1S2S3γ0
    0.99814802.05×1052.56−1.9861.2260.5
    下载: 导出CSV

    表  4  数值模拟与计算结果对比

    Table  4.   Comparison of numerical simulation and calculation results

    网格尺寸Bubble pulse r=6 r=12 r=18 r=24
    Rmax/cmT/ms pmax/MPa pmax/MPa pmax/MPa pmax/MPa
    0.25 cm23.947.5268.094.257.138.3计算结果
    25.850.1244.586.755.239.8理论结果
    −7.3%−5.2%+9.6%+8.7%+3.4%−3.7%偏差
    下载: 导出CSV

    表  5  不同放电能量、静水压力对应放电条件

    Table  5.   Different discharge energy, the hydrostatic pressure corresponding to the discharge conditions

    电压/kV静水压力/kPa等效放电能量/J放电条件 电压/kV静水压力/kPa等效放电能量/J放电条件
    14101.3210.431 20202.6521.285
    16101.3213.622 20303.9821.286
    18101.3217.243 20405.3021.287
    20101.3221.284 20506.6321.288
    下载: 导出CSV

    表  6  不同放电条件下对应气泡半径、周期时间变化

    Table  6.   Variation of bubble radius and cycle time under different discharge conditions

    放电能量变化 静水压力变化
    周期时间/ms 最大半径/cm放电条件 周期时间/ms 最大半径/cm放电条件
    一次脉动二次脉动 一次脉动二次脉动一次脉动二次脉动 一次脉动二次脉动
    4.083.782.261.871 2.942.702.251.895
    4.454.042.482.092 2.141.971.921.616
    4.774.212.702.263 1.711.551.721.437
    5.044.512.842.4041.441.281.561.308
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-10-08
  • 修回日期:  2022-03-28
  • 网络出版日期:  2022-03-29

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