基于重接原理的三级电磁发射系统

Experimental system and numerical simulation of 3-stage reconnection electromagnetic launch

为了揭示多级重接式电磁发射发射体的运动特性及规律,设计建立了用于实验研究的小型三级重接式电磁发射系统并进行仿真分析.介绍了重接式电磁发射的工作原理及运动模型,设计建立了用于实验研究的小型三级重接式电磁发射系统.整个系统包括3个相同的子系统和一个集中控制系统.在对实验模型数据实测并拟合的基础上,确定运动模型所需电感梯度和放电回路电参数,最终建立了发射体运动的数值仿真模型.对数值仿真模型包含的电路和运动方程采用四阶Runge-Kutta法进行数值求解,得到了三级发射的运动特性仿真结果.结果表明,当发射体速度不高时,加速过程完成于在电容器组向线圈放电起始很短的时间和距离内;加速的效果取决于适当的发射体初始位置;发射体终速度和发射整体效率都随电容器组存储能量的增加而增大;多级发射中后级效率高于前级,整体效率也随着发射级数的增加而增高.

In order to reveal the kinetic properties of projectile in multi-stage reconnection electromagnetic launch, a small-scale 3-stage reconnection electromagnetic launch system was designed and built for experimental research and simulation. The operation mechanism and kinetic model were introduced. A small-scale 3-stage reconnection electromagnetic launch system was designed and built for experimental research. The system consists of three same subsystems and a central control system. Based on the data measured from the experimental model, inductance gradient and other electrical parameters were acquired by curve fitting and computation, thus the kinetic model was set up for simulated calculations. The kinetic properties were obtained by solving the model＇ s circuit equation and motion equation with four-order Runge-Kutta method. The results show that the accelerating is completed within the initial short time and short distance after the capacitor bank discharges to the coil when the velocity of projectile is low. The effect of accelerating depends on a proper initial position of the projectile. Both the final velocity of projectile and the overall launch efficiency rise with the increased stored energy of capacitor banks. The efficiency of each stage rises in sequence during a multi-stage launch and the latter stage has a higher efficiency than the anterior one.