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RADIATIVE TRANSFER - VI. Proceedings of the 6th International Symposium on Radiative Transfer
June, 13-19, 2010, Antalya, Turkey

DOI: 10.1615/ICHMT.2010.RAD-6


ISBN Print: 978-1-56700-269-0

ISSN Online: 2642-5629

ISSN Flash Drive: 2642-5661

COUPLING RADIATION MODELLING WITH TURBULENT COMBUSTION IN LARGE EDDY SIMULATION

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

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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