激波诱导环形SF6气柱演化的机理

郑纯 何勇 张焕好 陈志华

郑纯, 何勇, 张焕好, 陈志华. 激波诱导环形SF6气柱演化的机理[J]. 爆炸与冲击, 2023, 43(1): 013201. doi: 10.11883/bzycj-2022-0226
引用本文: 郑纯, 何勇, 张焕好, 陈志华. 激波诱导环形SF6气柱演化的机理[J]. 爆炸与冲击, 2023, 43(1): 013201. doi: 10.11883/bzycj-2022-0226
ZHENG Chun, HE Yong, ZHANG Huanhao, CHEN Zhihua. On the evolution mechanism of the shock-accelerated annular SF6 cylinder[J]. Explosion And Shock Waves, 2023, 43(1): 013201. doi: 10.11883/bzycj-2022-0226
Citation: ZHENG Chun, HE Yong, ZHANG Huanhao, CHEN Zhihua. On the evolution mechanism of the shock-accelerated annular SF6 cylinder[J]. Explosion And Shock Waves, 2023, 43(1): 013201. doi: 10.11883/bzycj-2022-0226

激波诱导环形SF6气柱演化的机理

doi: 10.11883/bzycj-2022-0226
基金项目: 国家自然科学基金(12072162, 12102196);中国博士后科学基金(2022M711642);江苏省自然科学基金(BK20210322)
详细信息
    作者简介:

    郑 纯(1992- ),男,博士,博士后,Chun9211@njust.edu.cn

    通讯作者:

    陈志华(1967- ),男,博士,教授,chenzh@njust.edu.cn

  • 中图分类号: O354.5

On the evolution mechanism of the shock-accelerated annular SF6 cylinder

  • 摘要: 基于可压缩多组分Navier-Stokes控制方程,结合5阶加权本质无振荡格式以及网格自适应加密技术和level-set方法,数值模拟了平面激波(Ma=1.23)与环形SF6气柱(内外半径分别为8和17.5 mm)界面的相互作用过程。相比于之前的实验结果,数值模拟结果揭示了入射激波在界面内4次透射过程中的复杂波系结构,观察到透射激波在内部界面传播时形成自由前导折射结构并向自由前导冯诺依曼折射结构转换的波系演变过程;另外,界面内的复杂激波结构诱导内部下游界面上的涡量发生了3次反向;在界面演化后期,内部界面形成的“射流”结构与下游界面相互作用,诱导界面形成一对主涡、一对次级涡以及一个反向“射流”结构。定量分析了环形界面长度、宽度、位移、环量以及混合率的变化情况,结果表明,内部气柱的存在减弱了前期小涡结构合并形成大涡结构过程中对界面高度与长度的影响,同时提高了重质气体与环境气体的混合率。
  • 图  1  平面激波冲击圆形和环形SF6气柱界面的实验和数值密度纹影对比

    Figure  1.  Comparison of experimental and numerical density schlieren seqences of shock-accelerated circular and annular SF6 cylinder interface

    图  2  圆形SF6气柱界面特征点位移的实验(圆点)和数值(实线)结果定量对比

    Figure  2.  Quantitative comparison of experimental (dots) and numerical (lines) diagrams of the characteristic points on the shocked SF6 cylinder

    图  3  计算模型示意图

    Figure  3.  Illustration of the computational model

    图  4  网格收敛性验证

    Figure  4.  Grid convergence validation

    图  5  平面激波冲击环形SF6界面演化过程的密度纹影图

    Figure  5.  Density schlieren sequences of the evolution process of the shock-accelerated annular SF6 interface

    图  6  环形SF6气柱界面内上激波结构演化过程中的密度纹影图(上)和压力云图(下)

    Figure  6.  Density schlieren (upper) and pressure contour (lower) of the shock wave structure evolution in the annular SF6 interface

    图  7  界面的长度和高度

    Figure  7.  Histories of the length and height of interfaces

    图  8  界面位移

    Figure  8.  Histories of displacement of interfaces

    图  9  环形SF6界面上涡量$ \omega $的演化云图

    Figure  9.  Evolution of the vorticity $ \omega $ on the annular SF6 interface

    图  10  界面上总环量和环量绝对值随时间变化

    Figure  10.  Histories of the total circulation and the absolute value of the circulation of the interfaces

    图  11  上半部分界面总环量、正环量和负环量随时间变化

    Figure  11.  Histories of the total circulation, the positive circulation and the negative circulation of the upper half part interfaces

    图  12  气体混合率随时间的变化情况

    Figure  12.  Histories of the gas mixing rate

    表  1  气体参数

    Table  1.   Gas parameters

    气体名称比热比摩尔质量/(g·mol−1密度/(kg·m−3
    空气1.399 28.9671.23
    SF61.103128.4915.45
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出版历程
  • 收稿日期:  2022-05-26
  • 修回日期:  2022-10-24
  • 网络出版日期:  2022-11-02
  • 刊出日期:  2023-01-05

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