Experimental and Numerical Study of Premixed Combustion Within Nonhomogeneous Porous Ceramics

TLDR: In this paper, an experimental and numerical investigation of premixed methane combustion within a nonhomogeneous porous ceramic was performed and the results demonstrated that porous ceramic burners provided a range of stable burning rates at a constant φ, the maximum flame speed inside the burners was much higher than the premixed, freely burning adiabatic laminar flame (free flame) speed.

Abstract: An experimental and numerical investigation of premixed methane combustion within a nonhomogeneous porous ceramic was performed. The burner consisted of two porous ceramic cylinders of equal length and diameter that were stacked together and insulated around the circumference. Four series of experiments were carried out to determine the lean limit using three different pore sizes in the downstream ceramic cylinder (SBR). The pore size in the upstream ceramic cylinder was constant in all four cases. A new definition of the lean limit was introduced to account for the effects of the porous ceramic. The burners were tested over the range of lean limit 0.41 < φ≤ 0.68 and the numerical simulations were performed over 0.43 < φ ≤ 1.0. The results demonstrated that porous ceramic burners provide a range of stable burning rates at a constant φ, The maximum flame speed inside the burners was much higher than the premixed, freely burning adiabatic laminar flame (free flame) speed. The lean limits in the por...