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COUPLING RADIATION MODELLING WITH TURBULENT COMBUSTION IN LARGE EDDY SIMULATION

DOI: 10.1615/ICHMT.2010.RAD-6.520
pages 53-55

Damien Poitou
Centre RAPSODEE - Ecole des Mines d’Albi - Campus Jarlard - 81013 ALBI - France

Jorge Amaya
CERFACS - 42, Avenue Gaspard Coriolis - 31057 Toulouse Cedex 01 - France

Mouna El Hafi
Centre Energetique-Environnement CNRS - Faculté des Sciences et Techniques; Laboratoire de Géenie des Procédés des Solides Divisés, Ecole des Mines d'Albi, Carmaux, France

Benedicte Cuenot
CERFACS-CFC/Combustion, 42 Avenue G. Coriolis, 31057 Toulouse, France

Sinopsis

Simulation of turbulent combustion has gained high potential with the Large Eddy Simulation (LES) approach, allowing to predict unsteady turbulent reactive flows. In this approach only the largest scales of the turbulence are solved while the smallest scales are modelled. This approach permits to simulate complex industrial geometries on a wide range of Reynolds numbers. Previous works have shown the ability of LES to predict unsteady combustion behaviors such as: instabilites, ignitions and extinctions in industrial systems [1, 2, 3].
It has been demonstrated [4] that it is necessary to take into account thermal radiation losses in combustion caculations to increase their level of accuracy. The radiation is important as well for an accurate prediction of the temperature and the wall heat fluxes. Because the chemistry of polluting species is very sensitive to the temperature, the radiation is a key point for good predictions of the polluting species (CO, NOx, soot, ...). Radiation has also an influence on the life time of combustion chambers, so it is necessary to predict accurately the wall fluxes.
In this context, taking into account radiation rises new fundamental and practical questions. The physics involved in radiation and combustion are completely different: combustion is controlled by local exchanges and finite times whereas radiation is instantaneous and based on non-local exchanges. In order to couple radiation with turbulent combustion a methodology is needed regarding both physical and numerical aspects.

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