Simulation of Z-pinch experiments with a reflux hood structure
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摘要: 采用二维磁驱动数值模拟程序（MDSC2）对大电流脉冲功率装置FP-2上的回流罩结构Z-箍缩实验exp90和exp60进行了数值模拟。数值模拟表明，回流罩结构Z-箍缩实验测量电流/回路电流不是负载套筒电流，回流罩结构Z-箍缩实验中回路电流不完全从负载套筒通过，回路电流和负载套筒电流之间存在一个结构系数，提出了边界磁场强度与回路电流关系的新公式。采用具有结构系数的边界磁场强度公式和磁流体力学程序能正确模拟exp90和exp60两个回流罩结构Z-箍缩实验，模拟的套筒内径运动速度和实验测量速度相一致。回流罩结构Z-箍缩实验的结构系数为一常数，仅由回流罩的初始结构确定。90 mm和60 mm内直径套筒的结构系数分别为0.87和0.90。在套筒初始厚度、绝缘材料等其它条件相同的情况下，套筒内径越大，回流罩结构Z-箍缩实验的结构系数越小。
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关键词:
- 二维磁驱动数值模拟程序 /
- 回流罩结构Z-箍缩实验 /
- 磁流体力学 /
- 结构系数 /
- 数值模拟
Abstract: The Z-pinch experiments with a reflux hood structure, exp90 or exp60, were carried out in an intense pulsed power device FP-2 and simulated and analyzed by the two-dimensional magnetically driven simulation code (MDSC2). The numerical simulations show that the measured current/loop current is not a load current of liner in the Z-pinch experiment with the reflux hood structure. There is a structure coefficient between the measured current/loop current and the load current. A new formula for the relation between the boundary magnetic field and the loop current is presented. The new boundary magnetic field formula with the structure coefficient and the MDSC2 code can correctly simulate the Z-pinch experiments with a reflux hood structure. The simulated inner diameter velocity is consistent with the measured one by Velocity Interferometry System for Any Reflector (VISAR). The structure coefficients is a constant, which is determined only by the initial structure of Z-pinch with reflux hood structure. In the Z-pinch experiments with the reflux hood structure, the structure coefficients for the 90 mm inner diameter liner and the 60 mm one are 0.87 and 0.90 respectively. When the initial thickness of liner, insulation material and other conditions are the same, the larger the inner diameter of liner, the smaller the structure coefficient of Z-pinch with reflux hood structure. -
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