Numerical simulation of implosion of solid liner driven by disk explosive magnetic generator
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摘要: 根据电爆炸箔断路开关的简化数值模型和不可压缩固体套筒的零维模型，利用Matlab编写了用于模拟圆盘型发生器驱动固体套筒内爆的一体化程序D-Liner，对圆盘型发生器、电爆炸箔断路开关、固体套筒内爆的耦合过程进行了数值模拟，分析了电爆炸断路开关工作电压、套筒半径、套筒速度的变化过程以及电爆炸断路开关对发生器电流波形的影响，并对套筒参数进行了优化设计。计算结果表明，以直径400 mm的十单元圆盘型发生器为驱动源，采用长度72 cm、厚度120 m的铜箔作为脉冲锐化开关，当初始电流为5.9 MA时，圆盘型发生器能够获得35 MA的脉冲大电流，电爆炸箔断路开关在击穿与之并联的间隙开关之后可以在固体套筒上产生230 kV的高电压和31 MA、特征上升时间1.6 s的脉冲大电流，能够把50 g柱形铝套筒加速到13.7 km/s。Abstract: Based on the simplified model of electrically exploded opening switch(EEOS) and the zero-dimension model of solid liner, the code D-liner, which was designed to simulate implosion of solid liner driven by disk explosive magnetic generator(DEMG) with EEOS, was compiled with Matlab. To optimize the parameters of solid liner and analyze the variation of parameters, such as the voltage of EEOS, radius and velocity of liner and the effect of EEOS on DEMG current, the system with DEMG, EEOS and solid liner was simulated. The simulation results show that when the initial current is 5.9 MA, the 400 mm ten-element DEMG with EEOS, whose length is 72 cm and thickness is 120 m, can output 31 MA current on 50 g cylindrical aluminum liner with a characteristic rise time of 1.6 s, that the EEOS can transfer high voltage (230 kV) to the liner and that the 50 g cylindrical aluminum liner can be driven to 13.7 km/s.
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