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本文根据气固两相局部非热平衡假设,建立了甲烷/空气预混气在惰性多孔介质内的一维层流燃烧数学模型。分别采用附加导热、Rossland模型和二通量法模型求解固体能量方程中的辐射源项,研究了热辐射模型和弥散效应对多孔介质内燃烧火焰结构的影响。结果表明,多孔固体表面辐射的影响不可忽略,辐射模型对火焰温度的预测影响显著,而弥散效应对气体温度的分布及反应热影响则较小。
Based on the assumption of local non-thermal equilibrium of gas-solid two-phase, a mathematical model of one-dimensional laminar flow combustion of methane / air pre-mixed gas in inert porous media was established. Addition of heat conduction, Rossland model and two-pass model were used to solve the radiation source term in the solid energy equation. The effects of thermal radiation model and dispersion on the combustion flame structure in porous media were studied. The results show that the influence of radiation on porous solid surface can not be neglected. Radiation model has a significant effect on the prediction of flame temperature, while the dispersion effect has little influence on gas temperature distribution and reaction heat.