Pore-level numerical simulation of methane-air combustion in a simplified two-layer porous burner

Abstract

A simplified two-dimensional model of two-layer porous burner based on pore level is developed. The heat transfer of solid phase in porous burner is seen as the synergistic effects of conduction through connecting bridges and surface radiation between the solid particles in the model. A numerical simulation study on the characteristics of flow, combustion and heat transfer in the two-layer porous burner is carried out using the pore level model, and the effects of the control parameters such as the inlet velocity and solid thermal conductivity on thermal non-equilibrium are investigated. The results show that the flame structure is highly two-dimensional based on pore level. Obvious thermal non-equilibrium in the burner for the two phases and solid phase are observed, the largest temperature difference between the gas and solid phases is observed in combustion zone, while the temperature difference inside the solid particles is largest near the flame front. The results also reveal that thermal non-equilibrium of porous burner is much affected by the inlet velocity and solid thermal conductivity.