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Simulation analysis on interface thermal characteristic between rail and armature for electromagnetic railgun

机译：电磁轨道轨道与电枢界面热特性的仿真分析

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The interface thermal characteristic between rail and armature affects significantly the launch performance of electromagnetic railgun. In this paper, the friction coefficient f between brass and aluminum is discussed; it is found that under hypervelocity and electrical contact condition, f maintains an order of magnitude with 10−2, which is smaller than that under normal conditions. A further simulation model is developed to demonstrate concretely the order of magnitude of f when armature was launching in bore. Then, according to simulation results of interface temperature distribution, the thermal effect on armature wear and contact performance was analyzed. For an electromagnetic railgun with hypervelocity and high current, it is concluded that the heat on rail and armature interface mostly comes from friction, which can cause armature surface to melt and wear. The aluminum film is benefit for the contact performance as armature sliding.
机译：轨道和电枢之间的界面热特性显着影响电磁轨道的发射性能。在本文中，讨论了黄铜和铝之间的摩擦系数F;发现在超高速和电接触条件下，F维持10个幅度，其中10 -2 小于正常条件下的10个 -2 。开发了一种进一步的仿真模型，以在孔中发射电枢时具体地展示F的幅度。然后，根据界面温度分布的仿真结果，分析了对电枢磨损和接触性能的热效果。对于具有超高速和高电流的电磁轨道，得出结论是，导轨和电枢界面上的热量主要来自摩擦，这可能导致电枢表面熔化和磨损。铝膜有利于接触性能作为电枢滑动。

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