Simulation on magnetically-driven one-sided flyer plate experiments
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摘要: 磁驱动单侧飞片实验的数值模拟通常可不考虑厚的阴极的运动状态和厚度方向上烧蚀宽度的影响，采用单侧计算模型进行模拟。为了理解磁驱动单侧飞片实验可采用单侧计算模型的原因，为磁驱动单侧飞片实验的单侧计算建模提供理论依据，建立了磁驱动单侧飞片实验的双侧计算模型，并对PTS-061、PTS-064磁驱动单侧飞片实验进行了模拟分析。在PTS-061、PTS-064实验中，飞片的电流加载面的位移随着时间的增加持续增大；厚的阴极的电流加载面的位移不随时间的增加持续增大，在磁驱动实验中后期基本保持不变。PTS-061实验结束时，飞片的电流加载面的位移为4.9 mm，阴极电流加载面的位移仅为1.7 mm。PTS-064实验结束时，飞片的电流加载面的位移为4.1 mm，阴极电流加载面的位移仅为0.9 mm。磁驱动单侧飞片实验能采用单侧计算模型模拟的原因，不是阴极板面保持位置不动，而是阴极电流加载面的位移不随时间持续增加；在磁驱动实验后期，飞片电流加载面位移对边界磁场的影响远大于阴极电流加载面的位移对边界磁场的影响。Abstract: The numerical simulation of magnetically driven one-sided flyer plate experiment usually does not take into account the influences of cathode motion and ablation width in the thickness direction on the boundary magnetic field. Hence, one-sided computational model was usually applied to simulate magnetically driven one-sided flyer plate experiment. In order to understand the reason why magnetically driven one-sided flyer plate experiment can be simulated by one-sided computational model, magnetically driven one-sided flyer plate experiment (experiment PTS-061 with a 0.972-mm-thick aluminum flyer plate and experiment PTS-064 with a 1.041-mm-thick aluminum flyer plate) were simulated by two-sided computational model. In the experiments with experiment PTS-061 and PTS-064, displacement of thin flyer plate current-loading surface increases with time; displacement of thick cathode current-loading surface does not increases with time, and remains basically unchanged with small displacement in the middle and late stage of experiments. At the end of experiment PTS-061, displacement of thin flyer plate current-loading surface is 4.9 mm, and displacement of thick cathode current-loading surface is only 1.7 mm. At the end of experiment PTS-064, displacement of thin flyer plate current-loading surface is 4.1 mm, and displacement of thick cathode current-loading surface is only 0.9 mm. The reason of one-sided computational model can be adopted in magnetically driven one-sided flyer plate experiment is not that cathode plate position remains unchanged, but instead that cathode current-loading surface has smaller displacement remaining basically unchanged in the middle and later stage of experiments, and the displacement of thin flyer plate current-loading surface has a greater influence on the boundary magnetic field that of thick cathode current-loading surface in the late stage of experiments.
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图 4 PTS-064实验飞片自由面速度的单侧计算结果
Figure 4. Flyer plate free-surface velocities of experiment PTS-064 simulated by one-sided computational model
图 5 PTS-064实验真空间隙和飞片烧蚀宽度的单侧计算结果
Figure 5. Vacuum gap and flyer-plate ablation depth of experiment PTS-064 simulated by one-sided computational model
图 7 PTS-064实验飞片自由面速度的双侧计算结果
Figure 7. Flyer plate free-surface velocities of experiment PTS-064 simulated by two-sided computational model
图 8 PTS-064实验真空间隙和飞片烧蚀宽度的双侧计算结果
Figure 8. Vacuum gap and flyer plate ablation depth of experiment PTS-064 simulated by two-sided computational model
图 9 PTS-064实验飞片和阴极烧蚀厚度的双侧计算结果
Figure 9. Flyer plate and cathode ablation depths of experiment PTS-064 simulated by two-sided computational model
图 10 PTS-064实验飞片和阴极电流加载面位移的双侧计算结果
Figure 10. Displacements of flyer plate and cathode current-loading surfaces of experiment PTS-064 simulated by two-sided computational model
图 12 PTS-061实验飞片自由面速度的单、双侧计算结果
Figure 12. Flyer plate free-surface velocities of experiment TS-061 simulated by one-sided and two-sided computational models
图 13 PTS-061实验飞片和阴极电流加载面位移的双侧计算结果
Figure 13. Displacements of flyer plate and cathode current-loading surfaces of experiment PTS-061 simulated by two-sided computational model
表 1 磁驱动单侧飞片实验的负载参数
Table 1. Loading parameters for magnetically driven one-sided flyer plate experiments
实验 δf/mm δc/mm g0/mm W/mm PTS-061 0.972 5 2.0 15.0 PTS-064 1.041 5 1.2 12.5 
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