Simulations of the coupling between combustion and radiation in a turbulent line fire using an unsteady flamelet model

The general objective of this study is to evaluate the potential of advanced combustion and radiation models for large eddy simulations (LES) of fires. We adopt here an unsteady laminar flamelet model that includes: detailed information on combustion chemistry through a tabulated chemistry approach;...

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Bibliographic Details
Published in:Fire safety journal 2021-03, Vol.120, p.103101, Article 103101
Main Authors: Xu, Rui, Le, Van Minh, Marchand, Alexis, Verma, Salman, Rogaume, Thomas, Richard, Franck, Luche, Jocelyn, Trouvé, Arnaud
Format: Article
Language:English
Subjects:
Acoustics
Automatic
Biomechanics
Buoyant turbulent diffusion flame
CFD
Chemical Sciences
Combustion
Combustion chemistry
Coupling
Electric power
Electromagnetism
Engineering Sciences
Evaluation
Finite rate chemistry
Flamelet combustion
Fluid mechanics
Gas radiation
Large eddy simulation
Material chemistry
Materials and structures in mechanics
Mathematical Physics
Mechanics
Modeling
Physics
Polymers
Quantum Physics
Radiation
Radiation effects
Radiation heat transfer
Radiative transfer
Reactive fluid environment
Solvers
Thermics
Turbulence
Vibrations
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Summary:The general objective of this study is to evaluate the potential of advanced combustion and radiation models for large eddy simulations (LES) of fires. We adopt here an unsteady laminar flamelet model that includes: detailed information on combustion chemistry through a tabulated chemistry approach; a careful description of the combustion-radiation coupling (local radiation phenomena are treated by the flamelet solver while non-local radiation phenomena are treated by the LES solver through the radiative transfer equation); a description of subgrid-scale turbulence-radiation interactions; and a description of non-grey radiation effects (through a Weighted-Sum-of-Grey-Gases – WSGG model). The new flamelet-based combustion/radiation model is incorporated into the LES solver FireFOAM and is evaluated by comparisons with experimental data obtained in a turbulent line burner experiment previously studied at the University of Maryland. Comparisons between simulated and measured temperatures show relatively good agreement (and significant improvements compared to our previous work). In addition, comparisons between simulated and measured values of the global radiant fraction show that provided that the WSGG option is used, the flamelet model is capable of simulating changes in the flame radiative emissions that result from changes in the oxygen strength of the coflow.
ISSN:0379-7112
1873-7226
DOI:10.1016/j.firesaf.2020.103101