Numerical simulation of methane-air turbulent diffusion flame using Generalized finite rate approach

The numerical output of modeling a swirling natural gas diffusion flame confined in an axial symmetric furnace is presented in this paper. The flow modeling was done using Fluent software along with Gambit for mesh generation. CFD is based on the finite volume method for 2D axial symmetric problem , k,ε standard as a turbulence model, SIMPLE algorithm for coupling the velocity and pressure fields, P-1 radiation model, species conservative equations for combustion , and Eddy dissipation model for considering the effects of turbulence/chemistry interaction. The heat release of methane/air combustion was computed based on an integral, fast, one-step reaction: CH 4 + 2 O 2 → CO 2 + 2 H 2 O To verify the numerical results, The axial temperature distribution obtained from CFD analysis was compared with the corresponding experimental data. The importance of turbulence/chemistry interaction and the air swirl effects as well as the molecular concentration of species were then analyzed. The importance of considering radiation ,at walls and participating media, in the flow temperature distribution was shown.

کلیدواژه ها:

Methane/air diffusion flame ، Computational fluid dynamics ، Species transport ، Swirl ، P-1 radiation model