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

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