磁压对级联爆磁压缩脉冲发生器性能的影响
Influence of magnetic pressure on performance of cylinder-taper cascaded HMFCGs
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摘要: 为了研究负载为mH量级的间接馈电两级级联柱-锥构型的爆磁压缩产生器的基本物理过程和能量转换机理，利用描述爆磁压缩物理过程的2维爆轰磁流体力学程序MFCG(Ⅴ)，以实验模型结构参数为基础模拟计算了一系列模型，分析了磁压对金属套筒径向膨胀速度及膨胀过程的影响。计算结果表明：套筒的径向膨胀速度取决于爆轰压与磁压的共同作用，在爆磁压缩过程的绝大部分时间里，向外膨胀的爆轰压都远大于向内压缩的磁压，因而套筒的径向膨胀速度主要是由爆轰压决定;但是在功率放大级的后半段，也就是发生器电流增长最快阶段，磁压也迅速增长，它的增长大大降低了套筒的径向膨胀速度；在功率放大级的后期，磁压已经超过爆轰压，它对系统设计的影响已经不能完全忽略。Abstract: In order to study the basic physical process and energy conversion mechanism of helical magnetic flux compression generators (HMFCG) of the two-stage cylinder-taper configuration, a series of HMFCG models were simulated and analyzed using the code MFCG(Ⅴ). The influence of the magnetic pressure on the radial velocity and the expanding process of the armature were particularly analyzed. The simulation results show that during most time of the magnetic flux compression process, the radial velocity of the expanding armature is determined by detonation pressure, but with the current increase the effects of magnetic pressure become more and more important, which should be considered in designing the second stage of the HMFCG.
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