Abstract
The reasonably accurate numerical simulation of methane–air combustion is important for engineering purposes. In the present work, the validations of sub-models were carried out on a laboratory-scale turbulent jet flame, Sandia Flame D, in comparison with experimental data. The eddy dissipation concept (EDC), which assumes that the molecular mixing and subsequent combustion occur in the fine structures, was used for the turbulence–chemistry interaction. The standard k-ε model (SKE) with the standard or the changed model constant C1ε, the realizable k-ε model (RKE), the shear-stress transport k-ω model (SST), and the Reynolds stress model (RSM) were compared with the detailed chemical kinetic mechanism of GRI-Mech 3.0. Different reaction treatments for the methane–air combustion were also validated with the available experimental data from the literature. In general, there were good agreements between predictions and measurements, which gave a good indication of the adequacy and accuracy of the method and its further applications for industry-scale turbulent combustion simulations. The differences between predictions and measured data might have come from the simplifications of the boundary settings, the turbulence model, the turbulence–reaction interaction, and the radiation heat transfer model. For engineering predictions of methane–air combustion, the mixture fraction probability density function (PDF) model for the partially premixed combustion with RSM is recommended due to its relatively low simulation expenses, acceptable accuracy predictions, and quantitatively good agreement with the experiments.
Highlights
D than by the commonly used simple turbulence–chemistry interaction models coupled with global reaction kinetics in the simulations of industry-scale natural gas combustion furnaces
The eddy dissipation concept (EDC) and the probability density function (PDF) models were applied to Reynoldsaveraged simulations (RAS) of the turbulent methane–air combustion for the Sandia Flame D
For the validation of turbulence models, the predicted profiles by Reynolds stress model (RSM) with the EDCbased detailed chemical kinetic mechanism of GRI-Mech 3.0 more closely agreed with the experiments than those by standard k-ε model (SKE) and stress transport (SST)
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. An extended version of the EBU approach, known as the EDC, has been developed to incorporate detailed chemical kinetics in turbulent flows This model has shown adequate predictions for premixed, partially premixed, and non-premixed combustion regimes [26]. For applications of industry-scale natural gas combustion furnaces, the computational domains are, often much bigger (containing more grid cells) than those in experimental burners used to validate combustion models This makes simulations with detailed chemistry and complicated turbulence models, such as GRI-Mech 3.0, DES, and LES, very time consuming and sometimes impossible; a computationally inexpensive treatment of the chemical kinetics and turbulence models is sought for engineering applications. This work intends to provide a validated basis for these applications with acceptable expenses
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