为了分析轨道炮静止条件下膛内磁场分布特性,建立了轨道炮二维计算模型,基于磁扩散方程与安培定律,得到导轨和电枢各区域电流密度值,并通过毕奥-萨伐尔定律对轨道炮电枢前端各考察点磁通密度进行理论计算,基于电磁感应法进行了膛内磁场测量实验,实验测量值与理论计算值基本一致,结果表明,膛内磁场大小主要由流经电枢和导轨的的电流决定,电枢前端中心轴线上各考察点,随着与电枢前端面距离的增大,磁通密度峰值呈衰减趋势,但衰减速度逐渐变小。研究结果有助于轨道炮膛内强磁场屏蔽与智能弹药设计。

In order to analysis the electromagnetic railgun in-bore magnetic field distribution characteristic at zero speed, a two-dimensional railgun computational model is built. Based on the magnetic diffusion equation and Ampere’s law, the current density in each part of the rail and armature is obtained. Through the Biot and Savart’s law, the magnetic flux density of the investigated point which locates in front of the armature is calculated, Based on the electromagnetic induction method, the magnetic field measurement experiments are carried out. The experimental values are in agreement with the calculation values. The results show that the magnitude of the magnetic field is determined by the current flowing through the armature and rails. To the investigated points in the central axis in front of the armature, the magnetic flux density decreases with the increase of the distance from the investigated point to armature, but the decay rate is gradually smaller. The results are helpful for the in-bore magnetic field shielding and intelligent ammunition design.