Investigating the effects of several profiles of varying porousity on performance and emission of pollutants in the porous media burner

In this paper, a two-dimensional axisymmetric model for premixed methane/ air combustion in porous media has been developed.In this goal,a numerical model with chemkinII library is used along with its database. This code solves the continuity, navier stokes, the solid and gas energy and the chemical species transport equations using finite volume method. The pressure and velocity have been coupled with the simple algorithm. The burner under the study is a burner with two different zones in which the first one is a preheating zone and second one is a combustion zone. In this paper we try to apply the profile of porousity instead of constant porousity for two zones of burner. The results showed that by applying the varying porousity along the burner,the peak temperature can be decreased about 4.5%,subsequently, the amount of exhaust pollutants such as NOx can also be decreased while increase pressure losses along the burner is negligible.