固体电枢轨道炮非理想电接触的热效应分析
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摘要
为了避免接触转捩的发生,实现电磁发射技术的提高,更好地理解非理想电接触的物理本质以及模拟其热效应。根据点接触理论,建立了静态二维非理想电接触的计算模型,采用有限差分法模拟了接触电阻的热效应。计算结果表明,非理想电接触的表面温升高于理想接触,接触电阻层厚度和电导参数随温度变化的特性是影响其热效应的重要因素。研究结果为更准确地计算电接触表面的热扩散,进而更好地预测接触面处的材料状态提供了理论依据。
To avoid contact transition and achieve the advancement in electromagnetic launching technology,a better understanding of the underlying physics of imperfect electrical contact(ImPEC) and the abi-lity to simulate its thermal effect are very important and indispensable.Based on the point contact theory,a two-dimensional stationary model was developed,and the thermal effect of contact resistance was simulated with the help of finite difference method.The calculation results showed that temperature rise of imperfect electrical contact is higher than that of perfect contact,and the thickness of contact zone and temperature-dependent electrical conductivity of material are the main parameters for the thermal effect analysis.The study results can provide the theory basis for more accurate calculation of the thermal expansion and better prediction of the material state on the interface.
To avoid contact transition and achieve the advancement in electromagnetic launching technology,a better understanding of the underlying physics of imperfect electrical contact(ImPEC) and the abi-lity to simulate its thermal effect are very important and indispensable.Based on the point contact theory,a two-dimensional stationary model was developed,and the thermal effect of contact resistance was simulated with the help of finite difference method.The calculation results showed that temperature rise of imperfect electrical contact is higher than that of perfect contact,and the thickness of contact zone and temperature-dependent electrical conductivity of material are the main parameters for the thermal effect analysis.The study results can provide the theory basis for more accurate calculation of the thermal expansion and better prediction of the material state on the interface.
引文
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