Three-dimensional modelling of a two-layer porous burner for household applications

Abstract

A finite-volume calculation of the three-dimensional reacting flow in a porous burner is presented. The Navier-Stokes, energy and species transport equations are solved, and radiative heat transfer under local thermal non-equilibrium between the solid and gas phases is considered. Strong dissipation of the jets from the perforated plate is observed, contributing to the flame stabilization inside the ceramic foam. Simulation results for several operating conditions point to the potential for damage of the perforated plate, owing to the high radiative and conductive fluxes, and to the necessity of using smaller pore diameters to avoid flashback.

Propagation, dynamics and control of laminar premixed flames

“…If the heat transfer is not well established or controlled, flash-back (ignition of the mixture in the upstream part) might occur. To prevent this from happening, additional layers of materials have been added to the upstream part of the PIM in practical systems (see for instance [47]) as flame arrestor and/or flow distributor.…”

Combustion in porous media and its applications – A comprehensive survey

“…A finite-volume calculation of the three-dimensional reacting flow in a two-layer porous burner was presented by Hayashi et al (2004). The Navier-Stokes, energy and species transport equations were solved, and radiative heat transfer under local thermal nonequilibrium between the solid and gas phases was considered.…”

Experimental analysis of the effects of porous wall on flame stability and temperature distribution in a premixed natural gas/air combustion

“…The porous burner has several advantages compared with conventional burners, such as increasing flame stability, reducing pollutant emissions, uniform heat distribution, and preheating of unburned mixture 12 . These burners are first examined in a single layer; 13‐15 however, because of the unfavorable flashback phenomenon, multilayer porous medium is replaced 16‐20 . The effective parameters on the flame stability in porous burner are the incoming velocity mixture, the equivalence ratio, the porosity, and the thermophysical properties of the porous medium 21 .…”