Abstract: A heat transfer model combined conduction, radiation and phase change for multilayer composite insulation structure is built in this paper, radiative heat transfer in semitransparent participating material of the composite insulation structure is simulated by Monte Carlo method (MCM), and then be regarded as radiative source term of the energy equation, while energy equation is solved by finite volume method (FVM). Transient heat transfer characteristics of three different typical composite insulation structures, which are respectively composed of fiber blanket insulation and metal film, fiber blanket insulation, fiber reinforced aerogel and metal film, fiber blanket insulation, fiber reinforced aerogel, phase change insulation materials and metal film composite insulation structure, are analyzed and compared. Computational results show that the structures and components of the composite insulation significantly influence its transient heat transfer characteristics. The proposed research work can provide guidance for optimization design of the composite insulation structure.

Key words: multilayer composite insulation structure, transient heat transfer characteristics, phase change, Monte Carlo simulation, numerical analysis

摘要： 建立多层复合隔热结构辐射-导热与相变换热模型， 采用Monte Corlo方法模拟复合隔热结构内半透明介质的热辐射传递，有限体积法求解能量方程。分析比较了纤维隔热毡-金属膜复合结构、纤维隔热毡-纤维增强气凝胶材料-金属膜复合结构、纤维隔热毡-纤维增强气凝胶材料-相变隔热材料-金属膜复合结构等三类典型复合隔热结构的瞬态换热特性，研究表明不同的复合隔热结构组成其热特性差异显著，为复合隔热结构的设计、优化提供了指导思路。

关键词: 多层复合隔热, 瞬态热特性, 相变, Monte Carlo模拟, 数值分析