气体与粒子混合物辐射特性宽带k分布模型

Wide band k distribution model for radiative properties of gas and particle mixtures

建立了一种新的宽带k分布模型,用多项式拟合了水蒸气和二氧化碳气体10个重要谱带的k分布吸收系数。粒子的吸收和散射在各宽谱带上近似为灰体。用该模型计算了气体混合物以及气体与粒子混合物的辐射热通量,并与逐线计算进行比较。结果表明,宽带k分布模型和逐线计算结果吻合很好。本文提出的宽带k分布模型及拟合关系式大大提高了气体辐射特性的计算精度和计算速度,且对混合物的处理简单易行。

A new wide band k-distribution model was developed, in which the k-distribution absorption coefficients of carbon dioxide and vapor in ten main bands were expressed in polynomial functions.The absorption coefficient and scattering coefficient of particle were assumed gray in each band.The heat flux for gas and particle mixtures was computed by using the wide band k-distribution model and compared with that obtained by using line-by-line calculations.Comparison result showed that the relative errors of the wide band k-distribution model were very small.The new wide band k-distribution model and the polynomial functions could be used to calculate radiative properties of gases with higher accuracy while the time for calculation was reduced significantly.Furthermore, the wide bank k-distribution model could also be used for gas and particle mixtures.