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首页> 外文期刊>International Journal of Heat and Mass Transfer >Evaluation of flame emission models combined with the discrete transfer method for combustion system simulation
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Evaluation of flame emission models combined with the discrete transfer method for combustion system simulation

机译：结合离散传递方法评估燃烧模型的火焰发射模型

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摘要

This article considers the application of flame emission models used for predicting the thermal radiation fluxes from flames and fires within a computational fluid dynamic framework, used in conjunction with the discrete transfer method. The flame emission models differ in their generality, sophistication, accuracy and computational cost, and are assessed in terms of their ability to predict radiation transfer in idealised situations, as well as flames in tubes representative of burner systems, laboratory-scale jet flames and wind-blown jet fires. It is concluded that the implementation of simple flame emission models, based on the grey gas assumption, must be treated with caution due to convergence problems. The key problem occurs when the grey absorption coefficient is based on a length scale linked to the size of the control volume. This issue is well known in the radiation modelling community, but not so in the combustion modelling community. Use of models based on the banded mixed grey gas, TTNH, wide and narrow band approaches yield satisfactory results for all the simulated flames and fires considered, typically being within 20% of the measured radiation heat flux.
机译：本文考虑了火焰发射模型的应用，该模型用于预测在计算流体动力学框架内与离散传递方法结合使用的火焰和火的热辐射通量。火焰发射模型的通用性，复杂性，准确性和计算成本各不相同，并根据它们在理想情况下预测辐射传输的能力以及代表燃烧器系统的管内火焰，实验室规模的喷射火焰和风的能力进行评估喷火。结论是，由于收敛问题，基于灰气体假设的简单火焰排放模型的实现必须谨慎对待。当灰度吸收系数基于与控制体积大小相关的长度比例时，会出现关键问题。这个问题在辐射建模社区中是众所周知的，但在燃烧建模社区中却不是。使用基于带状混合灰气体，TTNH，宽带和窄带方法的模型，对于所有考虑的模拟火焰和火灾，通常会在所测辐射热通量的20％以内，从而得出令人满意的结果。

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