固体材料高温基础辐射物性的实验测量与理论建模

介电函数是固体材料的本征属性，是真正意义上的热辐射传输基础物性参数。固体表面发射率和颗粒弥散介质吸收系数等辐射特性参数均可由材料的介电函数和结构形状唯一地确定。目前高温条件下固体材料介电函数数据极为缺乏，已成为制约热辐射过程分析研究的瓶颈问题。本课题瞄准本学科国际研究前沿，研究高温条件下固体材料介电函数的实验测量、固体材料介电函数模型及其温度修正方法、固体材料介电函数的第一性原理模拟方法等固体材料高温基础辐射物性研究中亟需解决的共性问题。组建高温光谱介电函数测试平台，通过大量实验测量建立高温固体材料介电函数数据库；分析固体材料介电函数内在的主要影响机制，建立能涵盖较宽温度范围的材料经典介电函数修正模型；研究第一性原理模拟过程中系统温度的建入和修正方法，发展高温固体材料介电函数的第一性原理模拟方法，为热辐射传递的理论和应用研究提供必要的高温基础辐射物性数据及其有效的模拟方法。

As one of the intrinsic parameters of soild, dielectic function is the basic physical property of materials using in the field of thermal radiative transfer. The parameters, such as the emissivity of solid surface and the absorption coefficient of solid particulates, can be uniquely determined by the dielectric function and geometry of materials. Recently, the data of dielectric function of solid at high-temperature is very scarce. This now becomes a bottleneck limiting the analysis and study of thermal radiation processes. This project aims at the frontier research in thermal radiation, studies the general problems in the basic radiative properties of solid materials at high temperature, such as the experimental measurement of dielectric function, the dielectric function models and their modification due to temperature, and the first-principles simulation of dielectric function. The content of this project is as following: building up the test equipment of dielectric function of solid materials at high temperature, setting up a databank of dielectric function of solid materials at high temperature, analyzing the mechanism that affects the dielectric function, setting up the modified classical dielectric function models, their modification due to temperature, and the first-principles simulation methods. This project will provide the basic radiative properties and its effective simulation method of materials at high temperature for the research of thermal radiation.