中文摘要：

建立了基于光谱半球反射率和光谱半球透过率的二氧化硅气凝胶样品辐射特性参数的反演方法。采用离散坐标法、四通量法、二通量法计算了二氧化硅气凝胶样品内辐射传输问题,反演了样品的光谱辐射特性参数。结果表明,离散坐标法和四通量法反演结果几乎一致,二通量法反演结果小于离散坐标法和四通量法反演结果,而且误差较大,对于高孔隙率的二氧化硅气凝胶,界面反射对反演结果的影响很小,可以忽略。本文的研究工作对二氧化硅气凝胶辐射换热特性具有理论指导意义。

英文摘要：

The inverse method of radiative properties of silica aerogel based on the hemispherical reflectance and transmittance spectra was established.The radiative transfer problem of silica aerogel samples was calculated using discrete ordinates method,four-flux method and two-flux method respectively.The radiative properties of samples were obtained.Comparison of the discrete ordinates method,four-flux method and two-flux method indicated that the inverse results from the discrete ordinates method and the four-flux method were almost the same,the inverse results from the two-flux method were smaller than the values calculated by the discrete ordinates method and the four-flux method and the error is very large.The results also show that the interface reflection had little effect,can be neglected for high porosity silica aerogel.The research work of this paper has theoretical significance on radiative heat transfer of silica aerogel.