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Large eddy simulation of MILD combustion

par Amaduzzi, Ruggero ;Pequin, Arthur ;Parente, Alessandro
Référence Fundamentals of Low Emission Flameless Combustion and Its Applications
Publication Publié, 2022-01

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Résumé :

Moderate or intense low-oxygen dilution (MILD) combustion can deliver appealing features such as reduced pollutant emissions, elevated thermal efficiency, and fuel flexibility. Turbulence-chemistry interactions (TCI) in MILD combustion are enhanced due to the intense internal recirculation of combustion products, and complex unsteady phenomena may occur. Jet-in-hot-coflow burners emulate MILD conditions with highly diluted coflows, thus simplifying the fluid patterns. Industrial systems employ confined or reverse-flow configurations to enhance mixing and trigger MILD conditions in the combustion chamber, where the hot flue gases dilute the fresh reactant mixture. Despite successfully characterizing the flow field, Reynolds-averaged Navier-Stokes computations suffer at predicting turbulent mixing and nonequilibrium phenomena such as local extinction and reignition. Large eddy simulation (LES) can accurately capture turbulent mixing and unsteady flow structures. This chapter aims at presenting LES investigations in the context of MILD combustion along with the models employed for TCIs. General best-practice guidelines for MILD LES modeling are also discussed.