摘要
四轨电磁发射器的电流分布特性与其发射性能密切相关,较大的电流密度会导致枢轨的热烧蚀、磨损和转捩,严重制约发射器的使用寿命。为更好解决四轨电磁发射器电枢和轨道的热烧蚀问题,建立了3种不同构型的轨道和电枢,用有限元法对轨道和电枢的电流密度分布及电磁力进行比较分析,探讨枢轨凹凸值对电流分布和电磁力的影响。结果表明:凹椭圆型轨道提供较大电磁推力且枢轨接触面的电流密度分布最均匀,局部热损伤不明显;平面轨道提供的电磁推力较小,电流密度较大;凸椭圆型轨道电磁推力一般且枢轨接触面处电流分布不均;轨道电流密度大小与凹凸值负相关;而凹凸值对电磁推力的影响随枢轨构型不同而不同。
The current distribution characteristics of the four-rail electromagnetic launcher are closely related to its launch performance. The larger current density will lead to thermal ablation,wear and rotation of the rail and armature,which seriously restricts the service life of the launcher. In order to solve the thermal ablation problem of armature and rails of four-rail electromagnetic launcher,three different configurations of rail and armature were established. The current density distribution and electromagnetic force of rail and armature were compared and analyzed by finite element method. The results show that the concave elliptical rail can provide large electromagnetic thrust,the current density distribution of the contact surface between armature and rail is the most uniform,the local thermal damage is not obvious. The electromagnetic thrust provided by the plane rail is small and has the maximum current density. The electromagnetic trust provided by the convex elliptical rail is small and the current distribution of the contact surface is uneven. The rail current density is negatively correlated with the concave and convex values,while the influence of the concave and convex values on the electromagnetic thrust varies with the rail configuration.
作者
李腾达
冯刚
刘少伟
任师达
范成礼
LI Tengda;FENG Gang;LIU Shaowei;REN Shida;FAN Chengli(School of Air Defense and Missile Defense,Air Force Engineering University,Xi'an 710051,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2021年第5期5-11,共7页
Ordnance Material Science and Engineering
基金
国家自然科学基金(72001214)
国防科技基金(2201079)。
关键词
四轨电磁发射器
轨道构型
电流分布
电磁力
有限元仿真
four-rail electromagnetic launcher
rail configuration
current distribution
electromagnetic force
finite element simulation