一种瞬态接触热导数值模拟方法

A Numerical Simulation Method of Transient Thermal Contact Conductance

航天器的热工作环境是周期性的高低温交替,这要求结构具有较高的热防护性,而部件之间的接触热导对传热效率起到十分重要的作用。利用解析的法向接触模型模拟接触面微凸体变形,考虑热流在细通道传热的热流收缩,计算得出由接触面变形造成的接触热导值,将此值代入有限元软件,通过二次开发模拟高温情况下热辐射的影响,从而得出瞬态高温下接触热导估计值。这种新的估算高温接触热导的方法填补了之前研究低温接触热导不考虑热辐射影响的空白,为热防护结构的设计及可靠性评估提供参考。

Spacecraft＇s thermal operating environment is cyclical alternating high and low temperatures, which requires structures with high thermal protective, wherein the thermal contact conductivity between the components has played a very important role with the heat transfer efficiency. To simulates the micro convex surface deformation of the contact area by using analytical normal contact model. It calculates thermal contact resistance under the influence of elastic or plasticity contact deformation by considering thermal contraction in micro passageway, then puts the value into the finite element software to simulate thermal radiation at high temperature, at last estimates transient thermal contact conductance. The new method of estimating high-temperature thermal contact conductivity to fill the blank in the study of low-temperature thermal contact conductivity without considering the impact of thermal radiation, to provide reference for the design and reliability assessment of thermal protection structures.