电磁线圈炮计算程序的收敛性与实验验证

根据电磁线圈炮中推力线圈与电枢之间的感应耦合方程和电枢动态响应方程,考虑发射过程中推力线圈和电枢的欧姆加热,开发了电磁线圈炮的计算程序,给出了程序的算法和流程。分析了程序的收敛性,认为最大时间步长和电枢最大网格均依赖于驱动脉冲波形的上升时间。通过模拟结果与单级线圈炮实验测量结果的比较,验证了程序的有效性。模拟的线圈电流波形与实验波形吻合较好,模拟的出口速度比测量速度大约6.5%。程序收敛性和有效性的验证表明该程序可用于电磁线圈炮系统的初步设计。

Convergence of electromagnetic coilgun design code and its experimental validation

A coilgun design code is programmed according to the formulas describing the inductive coupling between the thrust coils and the armature, the dynamic response of the armature, and the ohmic heating in the thrust coils and armature. The algorithms determining the operation status of the driven pulse forming network are presented. The convergence of the code is analyzed. The maximum time-step and mesh size of the armature are dependent on the rise time of the driven pulse current. The code is validated by comparing the simulated results with the experimental ones. The calculated coil current wave is in agreement with the experimental results. However, the calculated velocity is higher than the measured one about 6.5%. The convergence and validation of the code indicate that it can be used for the primary design for a coilgun system.