多层隔热材料的热设计方法研究

摘要

基于多层隔热材料稳态辐射导热耦合传热提出一种多层隔热材料热设计方法,可以根据反射屏分布规律实现多层隔热材料热设计,给出最优反射屏数目和每层隔热材料的厚度.采用提出的热设计方法开展了热设计算例研究,结果表明:对按照层等温降和层等厚度规律设计的多层隔热材料,等厚度规律设计比等温降规律设计更能降低隔热材料的总质量,研究结果对多层隔热材料热设计研究具有一定的指导作用.%In this study a thermal design method based upon steady state conduction and radiation coupled heat transfer process is presented for multilayer thermal insulations.With the presented method the optimal number of reflecting foils and the thickness of each insulation layer could be obtained when the foil distribution characteristics in the multilayer thermal insulation was defined.Case studies for multilayer insulations thermal design under specified conditions were conducted.Results showed that the multilayer insulation designed with unvaried thickness in each insulation layer had less mass than the multilayer insulation designed with unvaried temperature drop in each insulation layer.Results obtained in this study may be useful in the thermal design of high temperature multilayer insulations.