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

LU Yu; GU Zhuowei; ZHOU Zhongyu; SUN Chengwei

doi:10.11883/bzycj-2021-0453

Volume 42 Issue 7

Jul. 2022

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LU Yu, GU Zhuowei, ZHOU Zhongyu, SUN Chengwei. Analysis and experimental verification of quasi-isentropic loading process in explosive-driven magnetic flux compression[J]. Explosion And Shock Waves, 2022, 42(7): 074101. doi: 10.11883/bzycj-2021-0453

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

doi: 10.11883/bzycj-2021-0453

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

Received Date: 2021-11-02
Rev Recd Date: 2022-01-17

Available Online: 2022-06-15

Publish Date: 2022-07-25

Abstract

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

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References

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