内爆磁压缩准等熵加载过程分析与实验验证

陆禹; 谷卓伟; 周中玉; 孙承纬

doi:10.11883/bzycj-2021-0453

内爆磁压缩准等熵加载过程分析与实验验证

doi: 10.11883/bzycj-2021-0453

陆禹^{1, 2,},
谷卓伟^2, ,,
周中玉²,
孙承纬³

1.
中国科学技术大学近代力学系，安徽合肥 230027
2.
中国工程物理研究院流体物理研究所，四川绵阳 621999
3.
中国工程物理研究院上海激光等离子体研究所，上海 201800

基金项目: 国家自然科学基金（11672276）

详细信息

作者简介:
陆　禹（1992－　），男，博士研究生，luyuustc@mail.ustc.edu.cn

通讯作者:
谷卓伟（1969－　），男，博士，研究员，guzhw1969@126.com

中图分类号: O361.3
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- 文章访问数: 281
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- 被引次数: 0
出版历程
- 收稿日期: 2021-11-02
- 修回日期: 2022-01-17
- 网络出版日期: 2022-06-15
- 刊出日期: 2022-07-25

Analysis and experimental verification of quasi-isentropic loading process in explosive-driven magnetic flux compression

LU Yu^{1, 2
,},
GU Zhuowei^{2
, ,},
ZHOU Zhongyu²,
SUN Chengwei³

1.
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, Anhui, China
2.
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
3.
Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China

摘要

摘要: 利用磁流体力学程序SSS-MHD模拟了炸药柱面内爆磁通量压缩发生器CJ-100装置的加载过程，讨论了各项装置参数的影响，结果表明装置可达到的峰值磁场值与初始磁场值成反比关系。设计了铁/铜夹层结构的样品靶，在该型装置上开展纯铁的准等熵加载实验。利用光子多普勒测速探头测量到6.43 km/s的样品靶自由面速度，在DT4铁中获得206 GPa的准等熵加载压力。铁材料的压力-比容曲线与理论等熵线基本重合，表明内爆磁压缩加载过程具有较高的等熵程度。
- 磁流体力学 /
- 内爆磁压缩装置 /
- 准等熵压缩 /
- CJ-100发生器
Abstract: Explosive-driven magnetic flux compression generator is a device that converts the chemical energy of explosives into electromagnetic energy. It has attracted great attention in the field of high energy density physics due to its wide application and important development prospect in magnetic field compression and material high pressure loading. CAEP has conducted a lot of research on CJ-100 device, which can stably generate an axial magnetic field of about 700 T. In order to investigate the loading capacity of CJ-100 device, the loading process and the effects of various device parameters are discussed by using the one-dimensional magnetohydrodynamics program SSS-MHD. The results show that the peak magnetic field that can be reached by the device is inversely proportional to the initial magnetic field, and the size of sample target has a great influence on the loading pressure. A sample target of iron/copper layered structure was designed for quasi-isentropic loading experiment of pure iron. The initial inner radius of the sample target was 3 mm, and the thickness of both iron and copper layer was 1 mm. The experiment was carried out on CJ-100 device with an initial magnetic field of 5.5 T, atmospheric pressure of several hundred Pa and ambient temperature. The free surface velocity of the sample target of about 6.43 km/s was measured with Photonic Doppler Velocimetry probes. SSS-MHD program with proper material models provided curve of velocity versus time that agree well with the experimental measurement. Simulation then shows that a quasi-isentropic loading pressure of 206 GPa is obtained in DT4 iron. The p-v curve of iron material is basically coincided with the theoretical isentropic line, indicating that the loading process of CJ-100 has a high isentropic degree.
- magneto-hydrodynamics /
- explosive-driven magnetic flux compression generator /
- quasi-isentropic compression /
- CJ-100 device

HTML全文

图 1 CJ-100实验系统^[10]

Figure 1. Experimental system of CJ-100

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图 2 CJ-100型装置的结构示意图和照片

Figure 2. Schematic design and photo of CJ-100 device

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图 3 CJ-100型装置的MHD计算模型

Figure 3. MHD modeling of CJ-100 device

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图 4 峰值压缩磁场和回转半径随初始磁场的变化曲线

Figure 4. Peak magnetic field and turning radius curves with different initial magnetic fields

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图 5 不同初始磁场情况下的磁场-时间曲线

Figure 5. Magnetic field vs. time curves with different initial magnetic fields

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图 6 样品靶的结构示意图

Figure 6. Structure diagram of sample target

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图 7 不同初始参数下铜夹层靶中的加载压力峰值

Figure 7. Peak loading pressure of Cu layered target with different initial parameters

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图 8 铜夹层靶的位置-时间曲线和压力-时间曲线

Figure 8. Position vs. time curve and loading pressure vs. time curve of Cu layered target

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图 9 铁/铜夹层样品靶结构示意图

Figure 9. Structure diagram of Fe/Cu layered target

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图 10 样品靶自由面速度的实验曲线和计算曲线

Figure 10. Measured and simulated free-surface velocity curves of sample target

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图 11 在17.1 μs时样品靶中静水压力、磁压力和材料密度的空间分布

Figure 11. Spatial distributions of hydro pressure, magnetic pressure and density in the sample target at 17.1 μs

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图 12 铁材料的压力-比容变化曲线

Figure 12. Pressure vs. specific volume curve in iron at Fe/Cu interface

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图 13 铁的相图^[21]和SSS-MHD程序计算的温度-压力加载路径

Figure 13. Phase diagram of iron^[21] and temperature vs. pressure curve calculated by SSS-MHD

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图 14 铜/铁界面内侧处铁材料的静水压力-时间曲线

Figure 14. Hydrostatic pressure vs. time curve of iron at inner side of copper/iron interface

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