线圈炮电枢电磁-热耦合仿真分析

 从麦克斯韦方程组和导热微分方程出发，导出了3维多级感应线圈炮电磁场、温度场分布的基本方程，并以电磁场和温度场有限元分析为基础，建立了3维有限元分析模型，忽略级间的相互影响，多级线圈炮中电枢温升可以等效为多个单级电枢的温升，运用通用有限元分析软件ANSYS的耦合计算流程，对单级感应线圈炮中电枢电磁场和温度场进行仿真。计算中考虑了材料物理参数随温度变化对温度场的影响。仿真结果表明：电枢内的温升主要分布在电枢的外表面和尾部；电枢的温度随着电容器组电压和电容增加而升高，这是因为总能量增大，电枢中涡流也增大，从而电枢的温度升高；电枢的触发位置和速度匹配关系，也会对电枢温升造成很大的影响;电枢的温度随着级数的增加逐渐升高，说明电枢在一定级数后达到了材料的熔点而被破坏。

Simulation analysis of electromagnetic-thermal coupling for armature in inductive coilgun

According to Maxwell's equations and heat-conduction differential equation,a mathematical model is developed to describe the distribution of electromagnetic field,inductive eddy current and thermal field for multi-stage induction coilgun.Based on the finite element method(FEM) analysis of electromagnetic and thermal fields,a three-dimensional FEM model is built.When ignoring the inter-stage effect,armature temperature rise calculated in multi-stage is equivalent to multiple armature temperature rise calcula...