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采用数值手段对贫甲烷/空气预混气体低速过滤燃烧火焰面倾斜动力学因素进行数值预测。确认多孔介质内局部孔隙率分布不均匀性、初始预热段预热不均匀性等因素是火焰面倾斜不稳定性发生的动因。火焰面倾斜演变的快慢与孔隙率分布不均匀性及初始预热段预热不均匀性具有相关性,孔隙率分布及初始预热越不均匀,火焰面倾斜不稳定性发展越快。此外,将数值预测结果与实验结果分析比较,确认实验中火焰面倾斜不稳定性发生及发展是多因素叠加扰动的结果。
The numerical method was used to numerically predict the kinetic factors of lean combustion of low methane / air premixed gas combustion flames. Confirmation of the heterogeneity of the local porosity distribution in the porous media and the non-uniformity of the preheating of the initial preheating zone are the motivations for the instability of the flame surface. The evolution of flame surface tilt is related to the heterogeneity of porosity distribution and the preheating nonuniformity of the initial preheating zone. The distribution of porosity and the nonuniformity of the initial preheating, the faster the flame surface tilt instability develops. In addition, numerical predictions and experimental results are compared to confirm that the occurrence and development of flame instability in the experiment is the result of multi-factor superposition perturbation.