Present study focuses on numerical investigation of two important partially-premixed inhomogeneous types of flames using REDIM-PFDF sub-grid scale combustion model. REDIM-PFDF model is based on the reaction-diffusion manifold (REDIM) technique and presumed filtered density function (PFDF) method. The detailed chemical kinetics is reduced into a two-dimensional chemistry table which is using the mass fractions of CO₂ ($Y_{C{O}_2}$) and N₂ ($Y_{N_2}$) as the reduced coordinates. The shapes of the Filtered Density Function (FDF) for $Y_{C{O}_2}$ and $Y_{N_2}$ are presumed to be clipped Gaussian and top-hat, respectively. We find that the top-hat function, in context of LES, is a suitable option to deal with multi-stream mixing problem. The comparison between LES and experimental data shows that the mixture fraction and mass fractions of several species are in a good agreement with the experimental data. The characteristics of two flames are also analyzed by comparing their OH mass fractions and CO₂ production rates.

目前的研究重点是使用REDIM-PFDF亚网格规模燃烧模型对两种重要的部分预混非均匀火焰类型进行数值研究。REDIM-PFDF模型基于反应扩散流形（REDIM）技术和假定的滤波密度函数（PFDF）方法。详细的化学动力学被简化为二维化学表格，该表格使用的是CO ₂（${ÿ}_{C{Ø}_2}$）和N ₂（${ÿ}_{{ñ}_2}$）作为精简坐标。过滤密度函数（FDF）的形状${ÿ}_{C{Ø}_2}$ 和 ${ÿ}_{{ñ}_2}$假定分别被裁剪为高斯和高帽。我们发现，在LES的上下文中，礼帽功能是处理多流混合问题的合适选择。LES与实验数据的比较表明，几种菌种的混合分数和质量分数与实验数据吻合良好。还通过比较两个火焰的OH质量分数和CO ₂产生率来分析其特征。