氩气环境中铝单丝电爆炸空间形态演化特性  

Structural Characteristics of Electrical Explosion of Single Aluminum Wire in Argon Gas

作　　者：刘浩宇[1] 赵军平[1] 裴哲浩 张锐 张乔根[1] LIU Haoyu;ZHAO Junping;PEI Zhehao;ZHANG Rui;ZHANG Qiaogen(State Key Laboratory of Electrical Insulation and Power Equipment(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China)

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市710049

出　　处：《中国电机工程学报》2020年第10期3377-3384,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51577153)。

摘　　要：搭建用于研究气氛环境中电爆炸过程的光–电联合诊断平台,对直径20μm铝丝在20~400kPa氩气中电爆炸过程的电参数及空间形态进行观测。根据电压、电流及辐射强度测量结果,对2种模式(内部击穿与外部分流)下的爆炸过程进行分析,计算得到比沉积能量、峰值功率、击穿场强等电参数随气压的变化规律。通过分幅图像与基于激光探针的阴影、纹影及干涉图像相结合,对泡沫状结构、分层现象及轴向分布不均匀性进行观测,同时分析得到3种典型形态的径向分布特征。通过阴影图像确定高密度丝核边界及冲击波的位置,重建不同气压下丝核与冲击波的扩散轨迹,并计算得到了其扩散速度。该文的研究结果对气氛环境中金属丝电爆炸机制的研究及其在应用中的参数优化具有参考价值。In this paper, a set of optical-electrical combined diagnostic platform was constructed for investigating electrical explosion of aluminum wires(with 20μm diameter) in 20~400 kPa argon gas. According to voltage, current and radiance intensity, two modes of electrical explosion, i.e. internal and shunting, were analyzed by stage division. The dependence of several electrical parameters, e.g. specific energy deposition, maximum power, breakdown electric field, on ambient pressure was also obtained. By combining multi-frame photographs and laser-based shadow, schlieren, interference images, foam-like structure, stratification phenomenon and inhomogeneity of spatial distribution of EEW were observed. Through interference fringe shift and its contrast with shadow and schlieren images, radial distribution of exploding wires under three circumstances were illustrated. The positions of shockwave and boundaries of metal cores were derived from shadowgraphs, and expansion trajectories were also reconstructed. It is hoped that this study will aid in better understanding of mechanisms of electrical explosion in atmosphere and act as a reference for parameter optimization in its applications.

关 键 词：金属丝电爆炸 空间形态 分幅成像 激光探针 干涉测量 

分 类 号：O461[理学—电子物理学]