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首页> 外文期刊>Journal of the Brazilian Society of Mechanical Sciences and Engineering >Comparison of spectral models in the computation of radiative heat transfer in participating media composed of gases and soot
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Comparison of spectral models in the computation of radiative heat transfer in participating media composed of gases and soot

机译：光谱模型在气体和烟灰组成的参与介质中辐射传热计算中的比较

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摘要

Accurate combustion models are necessary to predict, among other effects, the production of pollutant gases and the heat transfer. As an important part of the combustion modeling, thermal radiation is often the dominant heat transfer mechanism, involving absorption and emission from soot and participating gases, such as water vapor and carbon dioxides. If the radiative heat transfer is not accurately predicted, the solution can lead to poor prediction of the temperature field and of the formation and distribution of the gases and soot. The modeling of the absorption coefficient of the gases is a very complex task due to its highly irregular dependence on the wavenumber. On the other hand, the absorption coefficient of the soot is known to behave linearly with the wavenumber, allowing for a simpler approach. Depending on the amount of soot, the more sophisticated and expensive gas models can be replaced by simpler ones, without considerable loss of accuracy. In this study, the radiative heat transfer for a medium composed of water vapor, carbon dioxide and soot is computed with the gray gas (GG), the weighted-sum-of-gray-gases model (WSGG), and the cumulative wavenumber (CW) models. The results are compared to benchmark line-by-line (LBL) calculations.
机译：精确的燃烧模型对于预测除其他影响外的污染物气体的产生和热传递是必要的。作为燃烧模型的重要组成部分，热辐射通常是主要的传热机制，涉及烟灰和参与气体（例如水蒸气和二氧化碳）的吸收和排放。如果不能精确预测辐射热传递，则解决方案可能导致对温度场以及气体和烟灰的形成和分布的不良预测。气体吸收系数的建模由于其对波数的高度不规则依赖性而非常复杂。另一方面，已知烟灰的吸收系数与波数成线性关系，从而允许更简单的方法。根据烟灰量的不同，可以用较简单的气体模型代替更复杂，更昂贵的气体模型，而不会造成很大的准确性损失。在这项研究中，使用灰气体（GG），加权灰色气体总和模型（WSGG）和累积波数（ CW）模型。将结果与基准逐行（LBL）计算进行比较。

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