电磁轨道炮瞬态磁场测量与数值模拟  

Measurement and Numerical Simulation of Transient Electromagnetic Field in Railgun

作　　者：林庆华[1] 栗保明[1] 

机构地区：[1]南京理工大学瞬态物理国家重点实验室,江苏南京210094

出　　处：《兵工学报》2016年第10期1788-1794,共7页Acta Armamentarii

摘　　要：为研究电磁轨道炮的磁场特性,建立三维瞬态电磁场计算模型,采用时域有限元/边界元耦合方法进行求解,获得了电枢的膛内运动过程,以及电流密度和磁通密度的时空分布,讨论电枢与轨道间的滑动电接触在电流扩散过程中产生的速度趋肤效应。在发射实验中,用B探针测量电枢运动及磁场,分析了发射过程中的瞬态磁场变化特点,与数值模拟结果进行对比,验证了电磁轨道炮三维瞬态电磁场计算模型的有效性。A 3D transient electromagnetic field model is developed to investigate the characteristics of magnetic field in railgun. The proposed model is solved by a time-domain finite element and boundary-element coupling method. The kinematic process of armature in bore and the space-time distributions of current density and magnetic flux density were obtained. Velocity shin effect due to sliding electrical contact between armature and rails during current diffusion is discussed. In the launch experiment,a B-dot probe is used to measure the armature motion and magnetic filed. The characteristics of change in transient magnetic filed during launch are analyzed. 3D transient electromagnetic filed model of railgun is validated by comparison of experimental results with numerical simulation.

关 键 词：兵器科学与技术 轨道炮 电磁场 B探针 有限元 数值计算 

分 类 号：TM153.1[电气工程—电工理论与新技术] TJ012.15[兵器科学与技术—兵器发射理论与技术]