电爆炸过程中金属丝阻抗的变化  

Wire resistance variation during its electrical explosion

作　　者：杨家志[1] 刘钟阳[1] 许东卫[1] 刘天杰[1] 

机构地区：[1]大连理工大学电气工程与应用电子技术系,辽宁大连116024

出　　处：《爆炸与冲击》2009年第2期205-208,共4页Explosion and Shock Waves

摘　　要：为了掌握金属丝阻抗的变化规律,通过分压器和罗氏线圈分别测量出电爆炸过程中金属丝上的电压和电流,并由此计算出金属丝阻抗等相关电参数随时间变化的规律;采用F.D.Bennett和A.Hobson模型对金属丝阻抗进行了数值模拟,得到金属丝阻抗随时间的变化规律。实验结果和模拟结果的比较表明:两个模型的模拟结果均在金属丝气化前和部分初始放电电压下有效;当放电时电容器初始电压较大时,能量沉积速度更快,金属丝液化、气化、完全气化所用的时间更短;在金属丝爆炸过程中,金属丝阻抗存在一个最大值。The voltage and current of an exploding wire before its complete evaporation was obtained experimentally, and the variation of wire resistance and other parameters were calculated based on the experimental results. Bennett and Hobson＇s models were applied in simulating the resistance variation under the experimental parameters. The comparison between the experimental and simulated results shows that these two models are useful to guide the practice. These two models are both effective before the complete evaporation of the wire and under certain initial voltages of the capacitor. When the initial voltage of the capacitor is higher, the energy deposition velocity is faster, the time needed for the wire to melt and vaporize is shorter, and there＇lies a maximum resistance of the wire during its electrical explosion.

关 键 词：爆炸力学 阻抗变化 数值模拟 金属丝电爆炸 

分 类 号：O389[理学—流体力学]