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采用多孔介质内的一维反应流模型和详细的化学反应机理GRI3.0,数值模拟多孔介质内的预混燃烧过程.通过对能量方程中各项大小的考察,以及对火焰传播速度随火焰位置、相间对流换热系数、固体导热系数、消光系数等参数的敏感性分析,深入浅出地阐述了多孔介质中浸没火焰和表面火焰的传播和驻定机理.结果表明,多孔介质中浸没火焰的传播机理与有预热的层流预混自由火焰传播机理相似,表面火焰传播机理与反应区有热损失的层流预混自由火焰传播机理相似.
The one-dimensional reaction flow model in porous media and the detailed chemical reaction mechanism (GRI3.0) were used to numerically simulate the premixed combustion process in porous media.According to the investigation of various sizes in the energy equation and the correlation between the flame propagation velocity and the flame position , Convective heat transfer coefficient between phases, solid thermal conductivity, extinction coefficient and other parameters of sensitivity analysis, explain profound theories in simple language to expound the porous medium immersion flame and surface flame propagation and resident mechanism.The results show that the porous medium immersion flame propagation mechanism Similar to the prefired laminar prefixed free flame propagation mechanism, the surface flame propagation mechanism is similar to the laminar prefixed free flame propagation mechanism with heat loss in the reaction zone.