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基于多点接触理论建立了行波管慢波结构接触热阻的计算模型,模型的基本尺寸取自双频段毫米波螺旋慢波结构的设计模型,该模型综合考虑了界面粗糙度、界面压力、界面温度、镀膜与否等参量对界面接触热阻的影响,同时也考虑到了材料热导率随温度变化的特点以及通过界面间隙的辐射换热效应。在此基础上,利用ANSYS模拟仿真在不同参数下,由接触热阻引起的温差随接触间隙比以及接触凸体高度的变化趋势。该文所建立的计算模型及软件模拟方法能有效的仿真不同条件下行波管接触热阻的变化规律,也为以后行波管慢波结构的热分析提供给了一种新途径。
Based on the multi-point contact theory, the calculation model of the contact thermal resistance of the TWT slow-wave structure is established. The basic dimension of the model is taken from the design model of the dual-band millimeter-wave spiral slow-wave structure. The model considers the interface roughness, interface pressure, Interface temperature, coating parameters such as the impact on the contact resistance of the interface, but also taking into account the characteristics of the thermal conductivity of materials with temperature changes and the effect of radiation through the interface gap heat transfer. On this basis, using ANSYS simulation under different parameters, the temperature difference caused by the contact thermal resistance with the contact gap ratio and the trend of contact protrusion height. The calculation model and software simulation method established in this paper can effectively simulate the variation of contact thermal resistance of TWTs under different conditions and also provide a new approach for the thermal analysis of SWWs.