静止条件下轨道发射器瞬态电磁场分布有限元模拟

在电枢静止条件下建立了简单轨道发射器及块状电枢的三维有限元模型。利用ANSYS模拟得到了轨道及电枢内的瞬态电流密度分布。结果显示，在通电过程中电流趋向轨道内侧表面，并在电枢尾部与轨道接触处集中，电流线聚集是造成轨道和电枢之间放电烧蚀的最主要原因。同时得到的还有轨道发射器周围空间的瞬态磁场分布，其结果表明，感应磁场主要集中分布在靠近电枢尾部一侧的两轨道间，并向后延续到约等于4倍口径的长度，电枢所在的位置正好是磁场激增区域。

Finite Element Analysis of Electromagnetic Rail Launchers in Static Condition

A three-dimensional transient state finite element model of simple electromagnetic rail launcher and monolithic armature was built with software Ansys in zero speed condition. The results show that the current is concentrated within a thin layer at the inner side of the rail and ar- mature and in the back corners of the armature interface during the process of transmitting. As is known, the current concentration causes the discharge erosion between the rails and the armature. And the magnetic field is concentrated in the vicinity of armature＇s back between the two rails, which cover a length of about four times the calibers.