针对多孔基材复合液固相变反应器在运行过程中出现的过冷及相分离现象，本项目拟引入孔隙结构作为PCM材料热物性和PCM单元储/释热性能的调控手段之一。采用多学科、多尺度的研究方法，将数学建模、数值模拟与实验测量相结合，利用LBM模拟REV和孔隙尺度上多孔介质内液固相变换热过程，分析液固相变糊状区演化特性，认识孔隙结构对液固相变换热的影响机理，建立有效导热系数和相变特性瞬态模型，将其输入到REV尺度控制方程，建立多孔介质内流动、相变和传热非稳态模型，形成耦合多孔介质液固相变机理的PCM蓄热单元内液固相变和多相流模型及数值方法，确立PCM材料热物性和PCM单元储/释热性能的调控方法，为PCM材料制备与调控和PCM单元的设计与强化提供理论依据。

In view of the supercooling and phase separation phenomena during the operation of the phase change reactor of liquid-solid phase change materials (PCM) based on porous substrates, the porous structure of the porous media will be introduced as one of the ways to regulate and control the thermal physical properties of PCM and the storage/release properties and charging-discharging rates of PCM thermal energy storage unit. Using multidisciplinary and multi-scale research methods, combining mathematical modeling, numerical simulation and experimental measurements, LBM is used to simulate the thermal process of liquid-solid phase transformation on REV and pore scale. Evolution characteristics of liquid-solid phase transition zone are analyzed and mechanism of influence of pore structure on liquid-solid phase transition heat is explored. Transient models of effective thermal conductivity and phase transition characteristics are built up, and are brought into governing equations on REV scale so the unsteady models of flow, phase change and heat transfer in porous media are established completely. Liquid-solid phase change, multi-phase flow models and numerical methods in PCM thermal storage unit coupled with the mechanism of liquid-solid phase change in porous media are formed, and we can regulate and control thermophysical properties of PCM materials and charging-discharging properties of PCM thermal storage unit, which provide theoretical basis for the preparation and control of PCM materials and the design and strengthening of PCM thermal storage unit.