Numerical simulation of the multilayer coiled solenoid under implosive compression
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摘要: 利用AUTODYN二次开发接口建立三维多层密绕螺线管数值模型，并实现周期性边界条件，应用光滑粒子动力学方法对内爆压缩多层密绕螺线管过程及其界面不稳定性开展数值模拟。计算结果表明，内爆压缩螺线管结构过程存在扰动快速增长至后期的界面失稳现象，与对应的实验结果较为相符。同时，计算显示螺线管结构参数对界面不稳定性发展具有显著影响，螺旋角度减小，结构压缩后期的界面不稳定性趋于严重；铜线直径减小，结构压缩后期的界面不稳定性趋于减弱。Abstract: In order to simulate the implosive compression process of a multilayer coiled solenoid and its associated interfacial instability by using the smooth particle hydrodynamics (SPH) solver, the AUTODYN user-defined subroutines have been employed to build a three dimensional solenoid model and achieve periodic boundary conditions. The simulated results show that the perturbation of the solenoid structure in the implosive compression process grows fast and then the interface becomes unstable at the end of compression, in agreement with the experimental results. The parameters of the solenoid structure significantly affect the development of the interfacial instability. The smaller the spiral angle, the larger the interfacial instability at the end of compression process, one the other hand, the smaller the wire diameter, the weaker the interfacial instability at the end of compression process.
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图 1 多级MC-1装置实验原理图
Figure 1. Schematic of cascades MC-1 experiment in exploded magnetic field
图 6 爆轰压缩密绕螺线管的数值模拟
Figure 6. Numerical simulation of 3D solenoid under implosive compression
图 7 内爆压缩实验中多层密绕螺线管在不同时刻的闪光X射线照片
Figure 7. X-ray photographs of a single-cascade cross-section at different moments of its operation
图 8 不同螺线角度模型内界面不稳定扰动的数值模拟
Figure 8. Numerical simulation of different spiral angle structure under implosive compression
图 9 观测点粒子径向位移的方差
Figure 9. Observation of particle radial displacement variance changes
图 10 不同螺旋角度下结构扰动的形成过程
Figure 10. Formation processes of structure disturbance with different spiral angles
图 11 观测点粒子径向位移的方差
Figure 11. Observation of particle radial displacement variance changes
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