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首页> 外文期刊>International Journal of Heat and Mass Transfer >Wide band cumulative absorption coefficient distribution model for overlapping absorption in H_2O and CO_2 mixtures
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Wide band cumulative absorption coefficient distribution model for overlapping absorption in H_2O and CO_2 mixtures

机译：H_2O和CO_2混合物中重叠吸收的宽带累积吸收系数分布模型。

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摘要

An accurate wide band cumulative absorption coefficient distribution, g(k), model for thermal radiative transfer in gaseous media containing H_2O and CO_2 is presented. Assuming that the convoluted g(k) function for gas mixture retains the same functional form as the individual gases, the model treats overlapping bands as a "single", complex band with scaled parameters. Corresponding scaling algorithms are proposed for specific overlapping regions. Predictions of the mixture g(k) function and the band absorptance are in good agreement with the line-by-line calculation over a wide range of temperatures from 500 to 2500 K, and pressures up to 10.0 atm. The g(k) model is generally more accurate than the exponential wide band model, and provides comparable accuracy to the statistical narrowband model in predicting the total emissivity along an isothermal and homogeneous gas column under typical combustion conditions. In addition, this approach significantly enhances the computational efficiency.
机译：提出了一种精确的宽带累积吸收系数分布g（k）模型，用于在含H_2O和CO_2的气态介质中进行热辐射传递。假设混合气体的卷积g（k）函数保留与单个气体相同的函数形式，则该模型将重叠的带视为具有缩放参数的“单个”复杂带。针对特定的重叠区域提出了相应的缩放算法。混合物g（k）函数和谱带吸收率的预测与在500至2500 K的宽温度范围和最高10.0 atm的压力范围内的逐行计算非常吻合。 g（k）模型通常比指数宽带模型更准确，并且在预测典型燃烧条件下沿着等温和均质气柱的总发射率时，可以提供与统计窄带模型相当的准确性。另外，这种方法大大提高了计算效率。

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