RANS simulation of methane-air burner using local extinction approach within eddy dissipation concept by OpenFOAM

Non-premixed turbulent reacting flow in a methane-fuelled coaxial jet combustor has been studied numerically employing Reynolds Averaged Navier–Stokes (RANS) models. A local extinction approach for treating chemical reaction kinetics within the eddy dissipation concept (EDC) has been examined. It applies a database of pre-calculated chemical time scales, which contains the influence of chemical kinetics that is otherwise time-consuming to calculate. Simulations were carried out using standard k-epsilon, RNG k-epsilon and k-Omega SST turbulence models by open-source CFD-toolbox OpenFOAM. The results were compared to available numerical results and experimental data for predicting velocity, and temperature fields. All simulations were conducted with a reasonable number of meshes to demonstrate the accuracy of different turbulent RANS models in OpenFOAM solver which has a wide range of engineering applications in such type of flows.