通过二维双温多孔介质模型和燃料燃烧的详细化学反应机理,考虑气体在多孔介质的弥散效应,研究扩散过滤燃烧器内的温度分布、组分分布和辐射热效率等。数值预测的火焰结构与实验吻合的非常好。小球直径为3 18 mm,甲烷质量分数为0.2,随流速的增大,辐射热效率从78 2%减小到47.7%。同时,预测的污染物CO和NO_x排放很低,说明扩散过滤燃烧器作为辐射换热器是可行的。 Through the two-dimensional bi-temperature porous media model and the detailed chemical reaction mechanism of fuel combustion, the diffusion effect of gas in porous media is considered, and the temperature distribution, component distribution and radiant thermal efficiency in diffusion-filtered combustor are studied. The numerical prediction of the flame structure is in good agreement with the experiment. The diameter of pellets is 3 18 mm and the mass fraction of methane is 0.2. With the increase of flow rate, the radiant thermal efficiency decreases from 78 2% to 47.7%. At the same time, the predicted emissions of CO and NO_x are very low, indicating that diffusion filter burners are feasible as radiant heat exchangers.