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电磁轨道炮滑动电接触的热效应

DOI: 10.11858/gywlxb.2014.01.015, PP. 91-96

Keywords: 电磁轨道炮,滑动电接触,数值模拟,有限差分法,热效应

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Abstract:

为了更准确地反映滑动电接触面的温升过程,建立了电磁轨道炮高速滑动条件下非理想电接触的计算模型,采用有限差分法,对接触电阻热效应进行了计算。计算结果表明:非理想电接触的表面温升明显高于理想接触,接触电阻层的厚度越大,电接触面的温升越快;由于速度趋肤效应的影响,接触电阻热的作用范围主要集中在接触面尾部区域;材料的热导率及输入电流的波形均对接触面温度峰值有重要的影响。研究结果为预测接触表面的材料状态,进而预测接触转捩的发生提供了理论依据。

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