柱形汇聚几何中内爆驱动金属界面不稳定性

王涛; 汪兵; 林健宇; 钟敏; 柏劲松; 李平; 陶钢

doi:10.11883/bzycj-2019-0150

柱形汇聚几何中内爆驱动金属界面不稳定性

doi: 10.11883/bzycj-2019-0150

王涛^{1, 2,},
汪兵¹,
林健宇¹,
钟敏¹,
柏劲松^1, ,,
李平¹,
陶钢²

1.
中国工程物理研究院流体物理研究所，四川绵阳 621999
2.
南京理工大学能源与动力工程学院，江苏南京 210094

基金项目: 国家自然科学基金(11702272，11532012，11932018)；科学挑战专题(TZ2016001)

详细信息

作者简介:
王　涛（1979－　），男，硕士，副研究员，wtao_mg@163.com

通讯作者:
柏劲松（1968－　），男，博士，研究员，bjsong@foxmail.com

中图分类号: O347.5
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- 被引次数: 0
出版历程
- 收稿日期: 2019-04-23
- 修回日期: 2019-07-21
- 刊出日期: 2020-05-01

Numerical investigations of the interface instabilities of metallic material under implosion in cylindrical convergent geometry

WANG Tao^{1, 2
,},
WANG Bing¹,
LIN Jianyu¹,
ZHONG Min¹,
BAI Jingsong^{1
, ,},
LI Ping¹,
TAO Gang²

1.
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
2.
School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

摘要

摘要: 采用自研的高保真度爆轰与冲击动力学程序，对柱形汇聚几何中内爆驱动金属材料界面不稳定性的动力学行为，进行了数值模拟研究。结果表明，首次冲击后至约12 μs，界面发展以RM（Richtmyer-Meshkov）不稳定性为主；12 μs后至冲击波聚心反弹加载前，界面聚心运动处于加速减速状态，界面发展由RT (Rayleigh-Taylor)不稳定性主导；冲击波聚心反弹加载后，界面发展又由RM不稳定性主导。另外，还研究了初始条件（初始振幅、初始波长、钢壳初始厚度和几何构型）对柱形内爆驱动金属材料界面不稳定性的影响。结果显示：初始振幅较大时振幅增长也较大；初始波长较小（模数较大）时振幅增长较小，而且存在一个截止波长；钢壳厚度会抑制扰动增长，也存在一个截止厚度；几何汇聚效应会使扰动增长速度更快。
- 爆轰与冲击动力学 /
- 柱形内爆 /
- 金属界面不稳定性
Abstract: In this paper, the dynamical behavior of metal interface instability driven by implosion in cylindrical convergent geometry is numerically investigated by using an in-house high-fidelity detonation and shock wave program. The results indicate that, in the development process of perturbed interface, the RM instability is primary from the initial shock to 12 μs; after 12 μs and before rebound loading of the convergent shock wave, the interface moves towards the center deceleratedly with an increasing acceleration, and the RT instability dominates the evolution of perturbed interface; after the re-shock, the perturbation growth is dominated by the RM instability again. The effects of initial conditions such as the initial amplitude, wavelength (mode number), thickness of steel shell and geometry configuration on the metal interface instability driven by cylindrical implosion are also investigated. It is shown that, the instantaneous amplitude is larger when the initial amplitude is larger; the instantaneous amplitude is smaller when the initial wavelength is smaller, and a cutoff wavelength exists; the larger thickness of steel shell can suppress the perturbation growth, and a cutoff thickness also exists; the geometrical convergent effect causes the perturbation to grow faster.
- detonation and shock wave dynamics /
- cylindrical implosion /
- metal interface instability

HTML全文

图 1 爆轰驱动铝实验的扰动振幅

Figure 1. Perturbation amplitudes of experiments driven by explosion

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图 2 柱面内爆驱动金属材料界面不稳定性计算模型

Figure 2. Computational model of metal interface instability driven by cylindrical implosion

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图 3 密度显示的一维波谱图

Figure 3. One dimensional wave diagram displayed by density

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图 4 不锈钢壳内外界面加载压力

Figure 4. Loading pressures on inner and outer interface

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图 5 不锈钢壳内界面运动速度

Figure 5. Velocity of inner interface

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图 6 不锈钢壳内界面加速度

Figure 6. Acceleration of inner interface

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图 7 网格收敛性分析

Figure 7. Grid convergence

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图 8 密度场

Figure 8. Images of density fields

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图 9 钢壳内界面的扰动

Figure 9. Inner perturbed interface of steel shell

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图 10 双模态扰动演化的谱分析

Figure 10. Spectral analysis of dual mode perturbation evolution

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图 11 双模态扰动的振幅增长曲线

Figure 11. Amplitude growth curves of dual mode perturbation

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图 12 不同初始扰动振幅时的振幅增长曲线

Figure 12. Amplitude growth curves for different initial perturbation amplitude

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图 13 不同初始扰动模数时的振幅增长曲线

Figure 13. Amplitude growth curves for different initial perturbation mode number

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图 14 不同钢壳初始厚度时的振幅增长曲线

Figure 14. Amplitude growth curves for different initial thickness of steel shell

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图 15 不同几何构型下的振幅增长曲线

Figure 15. Amplitude growth curves for different geometrical configuration

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图 16 不同几何构型下的界面运动速度

Figure 16. Interface velocities for different geometrical configuration

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图 17 平面几何中的界面加速度

Figure 17. Accelerations of interface in planar geometry

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