孔隙尺度下仿生等级孔的相干散射判据建立及光谱辐射传输机制的研究

具有变孔径、三维微纳米跨尺度贯通特征的仿生等级孔可解决太阳能热化学、光催化等领域中存在的高效光子捕获与组分快速扩散的双重需求问题。光谱辐射传输机制不明晰是制约准确分析仿生等级孔在太阳能领域中应用时的能量传输及转换过程的瓶颈问题。拟开展孔隙尺度下三维仿生等级孔光谱辐射传输的研究：1）显微扫描结合图像重构法搭建精细化仿生等级孔的孔隙结构模型，电磁理论计算结合数值分析和实验测试建立全面的、系统的仿生等级孔相干散射判据；2）构建元胞肋筋间远场和近场相干散射效应的表征方法，建立考虑元胞内相干散射的光谱辐射传输方程的修正模型，解决现有孔隙尺度下仿生等级孔光谱辐射传输研究方法存在的计算能力与计算精度无法兼容的矛盾；3）厘清孔隙尺度下仿生等级孔的光谱辐射传输机制，构建由孔结构、元胞几何特征、材料等参数预测其等效辐射特性参数的高精度计算关联式。研究成果可为准确预测仿生等级孔内的能量传输及转换过程奠定基础。

Biomimetic hieratical porous has the advantages of variable pore size and three-dimensional micro nano cross-scale penetration. Biomimetic hieratical porous medium can solve the dual demanding of high-efficiency sunlight capture and rapid component diffusion, which are encountered in solar thermochemical reaction and photocatalysis. The unclear spectral radiative transfer mechanism is the bottleneck thermal problem that restricts the accurately analysis of the energy transmission and transfer in biomimetic hieratical porous when it is utilized in solar applications. This study will carry out the research on the pore level spectral radiative transfer: 1) building a pore level structure model of biomimetic hieratical porous, establish a comprehensive and systematic coherent scattering criterion of biomimetic hieratical porous by electromagnetic theoretical calculation combined with numerical analysis and experimental test; 2) carry out the far-field and near-field coherent scattering between cellular ribs of biomimetic hieratical porous, and propose a modified model of classical radiative transfer equation with the consideration of coherent scattering based on the geometrical optics approximation, which can solve the contradiction between the calculation ability and the calculation accuracy of the existing research methods of pore level spectral radiative transfer of biomimetic hieratical porous; 3) clarify the pore level spectral radiative transfer mechanism of biomimetic hieratical porous, and predict the equivalent radiative characteristics of biomimetic hieratical porous using correlations with the consideration of pore structure, cell geometry and material. The above researches can provide theoretical fundamentals of accurately predicting the energy transmission and transfer in biomimetic hieratical porous.