A Combustion Regime-Based Model for Large Eddy Simulation

Eugenio Giacomazzi and Donato Cecere
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Eugenio Giacomazzi: Laboratory of Processes and Systems Engineering for Energy Decarbonisation, ENEA, 00124 Rome, Italy
Donato Cecere: Laboratory of Processes and Systems Engineering for Energy Decarbonisation, ENEA, 00124 Rome, Italy

Energies, 2021, vol. 14, issue 16, 1-23

Abstract: The aim of this work is to propose a unified (generalized) closure of the chemical source term in the context of Large Eddy Simulation able to cover all the regimes of turbulent premixed combustion. Turbulence/combustion scale interaction is firstly analyzed: a new perspective to look at commonly accepted combustion diagrams is provided based on the evidence that actual turbulent flames can experience locally several combustion regimes although global non-dimensional numbers would locate such flames in a single specific operating point of the standard combustion diagram. The deliverable is a LES subgrid scale model for turbulent premixed flames named Localized Turbulent Scales Model (LTSM). This is founded on the estimation of the local reacting volume fraction of a computational cell that is related to the local turbulent and laminar flame speeds and to the local flame thickness.

Keywords: premixed turbulent combustion; premixed combustion regimes; micro-scale interaction; subgrid scale model; large eddy simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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