Turbulence-radiation interactions are studied in this work for large-eddy simulations (LES) of an artificially scaled configuration based on the Sydney bluff-body burner. This investigation is performed by applying the combustion model flamelet generated manifolds, and the transported PDF Eulerian stochastic field method is employed to account for turbulence-chemistry interaction. The radiative transfer equation is solved with the finite volume method, while the gas radiative properties are calculated using the non-gray weighted-sum-of-gray-gases (WSGG) model. For the solution of the energy conservation equation in LES, the filtered radiative source term, which is the difference between the filtered absorption term and the filtered emission term, is required. The absorption term is modelled with the optically thin fluctuation approximation and the emission term is computed by either omitting or considering the subgrid-scale contribution. The results indicate that the difference between the emission term calculated with these two procedures is significant only in the regions where the emission term is relatively small. Moreover, no relevant differences in the profiles of mean temperature computed for those two cases were found. These results suggest that the subgrid-scale contribution may be neglected for LES investigation of the considered configuration.

中文翻译：

---

具有辐射传热的钝体稳定非预混火焰的大涡模拟

在这项基于悉尼钝体燃烧器的人工缩放配置的大涡模拟 (LES) 中，研究了湍流-辐射相互作用。这项研究是通过应用燃烧模型火焰生成的流形来进行的，并且采用传输的 PDF 欧拉随机场方法来解释湍流-化学相互作用。辐射传递方程采用有限体积法求解，而气体辐射特性采用非灰色灰度加权和（WSGG）模型计算。为了求解 LES 中的能量守恒方程，需要过滤辐射源项，即过滤吸收项和过滤发射项之间的差值。吸收项用光学薄波动近似建模，发射项通过忽略或考虑亚网格尺度贡献来计算。结果表明，这两种程序计算的排放项之间的差异仅在排放项相对较小的地区才显着。此外，没有发现为这两种情况计算的平均温度曲线存在相关差异。这些结果表明，对于所考虑配置的 LES 调查，可以忽略亚网格尺度的贡献。结果表明，这两种程序计算的排放项之间的差异仅在排放项相对较小的地区才显着。此外，没有发现为这两种情况计算的平均温度曲线存在相关差异。这些结果表明，对于所考虑配置的 LES 调查，可以忽略亚网格尺度的贡献。结果表明，这两种程序计算的排放项之间的差异仅在排放项相对较小的地区才显着。此外，没有发现为这两种情况计算的平均温度曲线存在相关差异。这些结果表明，对于所考虑配置的 LES 调查，可以忽略亚网格尺度的贡献。