水蒸气和CO_2混合气体辐射特性宽带k分布模型

A Wide Band k-Distribution Model for the Radiative Property of Water Vapor and Carbon Dioxide Gas Mixture

针对水蒸气和二氧化碳混合气体辐射,建立了一种新的宽带k分布模型。从高温气体数据库HITEMP获取气体光谱辐射特性参数,用多项式拟合二氧化碳和水蒸气的吸收系数。用该模型计算不同温度与浓度下两无限大冷黑平板间充有N2-CO2-H2O混合气体时的壁面热流量,并与逐线计算、全光谱关联k分布模型和全光谱标定k分布模型的计算结果进行了比较。结果表明:该文提出的宽带k分布模型结果与逐线计算结果吻合较好,较全光谱关联k分布模型和全光谱标定k分布模型计算精度大大提高,且对于混合气体的处理相对简单。

A new wide band k-distribution model is developed to calculate the radiative properties of water vapor and carbon dioxide gas mixtures. The absorption coefficients of water vapor and carbon dioxide are expressed in polynomial functions based on the line parameters in HITEMP database. Results of wall flux between two cold and black parallel plates departed by water vapor and carbon dioxide gas mixtures are compared with that of line-by-line calculations, full-spectrum correlated k-distribution model and full-spectrum scaled k-distribution model, which shows that the relative error of wide band k-distribution model is much smaller than that of full-spectrum correlated k-distribution model and fuU-spectrum scaled k-dlstribution model. Furthermore, the wide k- distribution model can easily deal with gas mixtures.