Large Eddy Simulation (LES) is now an attractive and widely used model for predicting turbulent combustion that finds increasing use in studies of IC-engines, gas turbines, and dual-mode ramjet engines as well as in other applications. Several parameters, e.g. which subgrid turbulence model, reaction mechanism, and filtered reaction-rate model is used, determines the accuracy and robustness of the LES model, together with the choice of numerical methods and grids. Extensive studies are ongoing to further elucidate these issues, and to develop more accurate and robust models. However, most often are thermal-radiation and conjugate heat-transfer overlooked. This may be due to the challenges associated with the physics and modeling of thermal-radiation heat-transfer. Only a handful studies deal with this topic, suggesting that although the global effects in terms of power are small, the energy redistribution by thermal-radiation is important. Here, we apply finite-rate chemistry LES to a well-known bluff-body stabilized flame, for which experimental data is available to analyze the influence of thermal-radiation and conjugate heat-transfer on the flow/flame. Two thermal-radiation models, the P1 and fvDOM models, are used to examine the sensitivity of this modeling, and comparisons are made with experimental velocity, temperature and CO mass-fraction profiles, with and without conjugate heat-transfer. The results show that the LES results taking thermal-radiation and conjugate heat-transfer into account are in better agreement with the experimental data than the LES results not taking these effects into account. Also, the differences between the P1 and fvDOM models are small, but with the results using the fvDOM model in better agreement with the experimental data. The LES results are also used to elucidate the flow/flame physics, and the influence of thermal-radiation and conjugate heat-transfer that should not be overlooked in studies of turbulent combustion.

大型涡流模拟（LES）现在是用于预测湍流燃烧的一种有吸引力且广泛使用的模型，该模型在IC发动机，燃气轮机和双模冲压发动机的研究以及其他应用中得到越来越多的使用。使用几个参数，例如使用哪个子网格湍流模型，反应机理和滤波后的反应速率模型，可以确定LES模型的准确性和鲁棒性，并选择数值方法和网格。正在进行广泛的研究，以进一步阐明这些问题，并开发更准确，更可靠的模型。但是，最常见的是忽略了热辐射和共轭传热。这可能是由于与热辐射传热的物理和建模相关的挑战。只有很少的研究涉及这个主题，这表明尽管在功率方面的总体影响很小，但通过热辐射进行的能量重新分配却很重要。在这里，我们将有限速化学LES应用于著名的钝体稳定火焰，对于该火焰，实验数据可用于分析热辐射和共轭传热对流动/火焰的影响。使用两个热辐射模型P1和fvDOM模型来检查此模型的敏感性，并在有和没有共轭传热的情况下，对实验速度，温度和CO质量分数分布进行了比较。结果表明，与不考虑这些影响的LES结果相比，考虑热辐射和共轭传热的LES结果与实验数据更加吻合。也，P1模型和fvDOM模型之间的差异很小，但是使用fvDOM模型的结果与实验数据更加吻合。LES的结果还用于阐明流动/火焰物理，以及在湍流燃烧研究中不容忽视的热辐射和共轭传热的影响。