电磁轨道炮电枢-导轨接触表面状况数值研究  

Numerical study of armature-rail contact interfacial conditions in electromagnetic railguns

作　　者：巩飞[1] 翁春生[1] 

机构地区：[1]南京理工大学瞬态物理国家重点实验室,江苏南京210094

出　　处：《南京理工大学学报》2014年第3期396-401,408,共7页Journal of Nanjing University of Science and Technology

基　　金：高等学校博士学科点专项科研基金(20093219110037)

摘　　要：为了了解电磁轨道炮电枢-导轨接触表面的电热特性,采用接触表面热流量模型,利用有限差分法模拟了非理想电接触的热效应。研究了不同结构的电枢对接触压力和接触表面温升过程的影响以及摩擦对电枢运动状态的影响。计算结果表明:C型电枢与块状电枢相比可以提供更高的接触压力,其接触表面温度峰值更低,降幅达到31%,温度分布更加均匀;电枢的臂角角度降低15°,接触表面的温度峰值下降超过10%;摩擦延缓了电枢运动,速度下降约9%,不利于提高发射效率。To understand the electrothermal properties of the armature-rail electrical contact interfaces in electromagnetic railguns exactly, the thermal effect of imperfect electrical contact （ImPEC） is modeled using the contact heat flux model and finite difference method. The friction effect and the effects of different geometry of armatures on the contact force and temperature rise are studied. The calculation results show that the C-shape armature can provide a higher contact force than the block one. The maximum temperature of the contact interface decreases by 31% ,and the temperature distribution is more uniform in the C-shape armature. With a decrease of 15° in the rear angle of the armature,the maximum temperature of the contact interface decreases by more than 10% . The friction delays the motion of the armature and the velocity decreases by 9% ,which is un-favorable for the transmitting efficiency.

关 键 词：电磁轨道炮 电枢-导轨 接触表面 电热特性 有限差分法 非理想电接触 热效应 接触压力 温升过程 摩擦效应 

分 类 号：O442[理学—电磁学]