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Based on the assumption of a local non-equilibrium of heat transfer between a solid matrix and gas,a mathematic model of coal mine methane combustion in a porous medium was established,as well the solid-gas boundary conditions.We simulated numerically the flame propagation characteristics.The results show that the flame velocity in ceramic foam is higher than that of free laminar flows;the maximum flame velocity depends on the combined effects of a radiation extinction coefficient and convection heat transfer in ceramic foam and rises with an increase in the chemical equivalent ratio.The radiation extinction coefficient cannot be used alone to determine the heat regeneration effects in the design of ceramic foam burners.
Based on the assumption of a local non-equilibrium of heat transfer between a solid matrix and gas, a mathematic model of coal mine methane combustion in a porous medium was established, as well as solid-gas boundary conditions. We simulated numerically the flame propagation the results show that the flame velocity in ceramic foam is higher than that of free laminar flows; the maximum flame velocity depends on the combined effects of a radiation extinction coefficient and convection heat transfer in ceramic foam and rises with an increase in the chemical equivalent ratio.The radiation extinction coefficient can not be used alone to determine the heat regeneration effects in the design of ceramic foam burners.