Lu Yu, Chen Kaiguo, Cheng Cheng, Zhou Zhongyu, Luo Binqiang, Chen Xuemiao, Zhang Xuping, Wang Guiji, Tan Fuli, Zhao Jianheng, Gu Zhuowei, Sun Chengwei
Department of Modern Mechanics, University of Science and Technology of China, Hefei, 230027, China.
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900, China.
Sci Rep. 2021 Oct 19;11(1):20688. doi: 10.1038/s41598-021-99479-3.
This paper reports on the development of a magnetically driven high-velocity implosion experiment conducted on the CQ-3 facility, a compact pulsed power generator with a load current of 2.1 MA. The current generates a high Lorentz force between inner and outer liners made from 2024 aluminum. Equally positioned photonic Doppler velocimetry probes record the liner velocities. In experiment CQ3-Shot137, the inner liner imploded with a radial converging velocity of 6.57 km/s while the outer liner expanded at a much lower velocity. One-dimensional magneto-hydrodynamics simulation with proper material models provided curves of velocity versus time that agree well with the experimental measurements. Simulation then shows that the inner liner underwent a shock-less compression to approximately 19 GPa and reached an off-Hugoniot high-pressure state. According to the scaling law that the maximum loading pressure is proportional to the square of the load current amplitude, the results demonstrate that such a compact capacitor bank as CQ-3 has the potential to generate pressure as high as 100 GPa within the inner liner in such an implosion experiment. It is emphasized that the technique described in this paper can be easily replicated at low cost.
本文报道了在CQ - 3装置上进行的磁驱动高速内爆实验的进展情况，CQ - 3是一台紧凑型脉冲功率发生器，负载电流为2.1兆安。该电流在由2024铝制成的内、外衬套之间产生高洛伦兹力。等间距布置的光子多普勒测速探头记录衬套速度。在实验CQ3 - Shot137中，内衬套以6.57千米/秒的径向收敛速度内爆，而外衬套以低得多的速度膨胀。采用适当材料模型的一维磁流体动力学模拟给出了速度与时间的曲线，与实验测量结果吻合良好。模拟结果表明，内衬套经历了无冲击压缩至约19吉帕，并达到了非雨贡纽高压状态。根据最大加载压力与负载电流幅值平方成正比的比例定律，结果表明，像CQ - 3这样的紧凑型电容器组在这种内爆实验中有可能在内衬套内产生高达100吉帕的压力。需要强调的是，本文所述技术可以很容易地低成本复制。
