Abstract: The objective of the study was to investigate the mechanisms and heat transfer characteristics of phase-change thermal control unit during the flight of aircraft.Considering the conduction in the solid and natural convection in the liquid，the physical and mathematical model for the heat transfer was formulated.The governing conservation equations were solved using the finite-volume method on fixed grids.An enthalpy-porosity method was used for modeling the melting phenomena of phase-change thermal control unit.The time and space movement of the phase front，the temperature distribution，and the heat dissipation rate has been analyzed based on the model.The influence of the unit geometry，heat source location，type of phase change materials，as well as the boundary condition on the thermal performance of the thermal control unit was investigated.This model and numerical method was evaluated by comparing the numerical predictions with the experimental results.The results from the analysis elucidate the thermal performance of phase-change thermal control unit and will provide the bases to the design and optimization of thermal control unit.

Key words: thermal control, phase-change, fluid-solid coupling, heat transfer

摘要： 针对舱内热控用相变热控装置内部的传热特点，研究装置内相变材料吸热过程的相变传热及流固耦合传热规律，建立了相应的数理模型及数值计算方法，进行了实验验证，并在此基础上分析了典型热控单元吸热特性的影响因素及作用规律。相关研究成果将为相变热控装置吸热及热控特性的有效预测，以及为装置的设计及优化提供参考。

关键词: 热控制, 相变, 流固耦合, 传热