根据Maxwell方程推导出电磁场参数与速度之间的关系,建立了直角坐标下的电磁场和温度场扩散2维偏微分方程,分析了固体电枢电磁轨道炮的速度趋肤效应.以矩形固体电枢为例,给出了边界条件和激励源函数.采用有限差分法对方程进行求解,并对数据进行了分析,得到轨道和电枢中磁感应强度、温度和电流密度的分布曲线.计算结果表明:电枢的运动使得电流密度集中在电枢和轨道交界面的尾部,使得该局部地区温度增加,进而引起电枢尾部的熔融与烧蚀.%To study the velocity skin effect of railgun with solid armature, the relationships between the electromagnetic pa-rameters and armature moving velocity were presented by Maxwell electromagnetic theory. The two-dimensional partial differenti-al equations for electromagnetic field and temperature field in Cartesian coordinate system were set up; For a rectangular solid ar-mature, the boundary conditions and excitation functions were described for the equations, the partial differential equations were resolved using finite difference method, the results were analyzed and the distributions of magnetic induction, temperature and current density within the rail and armature were obtained. The final results show that, the armature movement causes a high cur-rent density concentrating on the tail end of the interface of rail and armature, and subsequently increases the local temperature dramatically, melts and ablates the tail end of the armature.
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