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Multi-scale high intensity turbulence generator applied to a high pressure turbulent burner

Romain Fragner
CNRS ICARE 1C, Avenue de la Recherche Scientifique, 45072 Orleans Cedex 2 France

Nicolas Mazellier
Laboratoire PRISME, Universite d'Orleans, 8, rue Leonard de Vinci, 45071 Orleans cedex 2, France

Fabien Halter
ICARE-CNRS, 1C Avenue de la Recherche Scientifique 45071 Orléans Cedex, France

Christian Chauveau
CNRS - INSIS, Institut de Combustion, Aérothermique, Réactivité, Environnement, 1C Avenue de la Recherche Scientifique, 45100 Orléans, France

Iskendar Gokalp
CNRS ICARE 1C, Avenue de la Recherche Scientifique, 45072 Orleans Cedex 2 France

Résumé

This study is performed to investigate the interactions between a turbulent flow field and a premixed flame. Comparisons between the turbulence generated by a multi grid turbulence generator and a single grid turbulence generator are made. For this comparison we used the data of Lachaux et al. (2005) for a methane-air premixed flame with an equivalent ratio of 0.6. The turbulence intensity is found to be 40% higher in the isotropic and homogeneous zone of the potential core for the multi grid configuration compared to the single grid configuration. It is also found that the isotropy and homogeneity levels are lower for the multi-grid than for the single grid turbulence generation. Kolmogorov scales are found 2 times lower for a multi grid generation than for a single grid generation at equivalent pressure conditions; Taylor length scales are found lower as well. The effects of multi-scale grid turbulence generation on the premixed