The interaction of a stoichiometric, laminar premixed methane/air flame with a coolant jet is investigated using two-dimensional fully resolved simulations (FRSs). The flame is forced at the inlet with velocity modulation and the coolant is injected from a cooling hole located on the wall at the same temperature as the premixture. FRS cases featuring a combination of blowing ratios, forcing frequencies, position of the cooling hole and the coolant type (air and \(N_2\)) are studied to understand the effects of these parameters on flame dynamics and CO emissions. The results show a negligible impact of the forcing frequency on the exhaust CO emissions. However, increasing the blowing ratio and the cooling hole streamwise location both increase the exhaust CO emissions. Using air instead of nitrogen as the coolant reduces the CO emission by providing additional oxygen and therefore enhancing CO oxidation. Furthermore, analysis of the CO mass fraction in the near-wall, post-cooling hole region shows a strong dependence on the local temperature and the mixture fraction used as a measure of dilution. CO mass fraction—temperature (\(Y_{CO} - T\)) scatter plots reveal the same trends as those of one-dimensional (1D) freely-propagating flames at different equivalence ratios up to a limit, identified using a progress variable based on the \(CO_2\) mass fraction. The results of this work highlight the potential pathways for modelling the near-wall CO mass fraction in effusion cooled combustors.

使用二维完全解析模拟（FRS）研究了化学计量的层流预混甲烷/空气火焰与冷却剂射流的相互作用。火焰以速度调节作用在入口处，冷却剂从位于壁上的冷却孔以与预混合物相同的温度注入。研究了结合了吹风比，强制频率，冷却孔位置和冷却剂类型（空气和\（N_2 \））的FRS案例，以了解这些参数对火焰动力学和CO排放的影响。结果表明，强迫频率对废气CO排放的影响可忽略不计。但是，增加吹气比和冷却孔沿流向都增加了排气量一氧化碳排放量。使用空气代替氮气作为冷却剂可通过提供额外的氧气来减少CO排放，从而增强CO的氧化。此外，对近壁，冷却后孔区域中的CO质量分数的分析显示出对局部温度的强烈依赖性以及用作稀释度的混合物分数。CO质量分数-温度（\（Y_ {CO}-T \））散点图显示了与一维（1D）自由传播的火焰相同的趋势，其不同的当量比直至极限，使用进度变量确定基于\（CO_2 \）质量分数。这项工作的结果突显了用于模拟喷射冷却燃烧室中近壁CO质量分数的潜在途径。