Contribution à la modélisation des écoulements turbulent réactifs partiellement prémélangés

Abstract : The present study is devoted to the numerical modeling of turbulent reactive flows in situations where reactants are not ideally premixed. In this case, the description of the local thermochemistry requires at least two variables. Here we chose the mixture fraction » to describe the local composition of fresh mixture and the fuel mass fraction Y to evaluate the progress of the chemical reaction. The numerical model is based on the LW-P analysis but here the joint velocity-scalar discrete PDF made of Dirac delta functions is considered in the context of a second order modeling. New algebraic closures for the scalar dissipation terms are proposed to represent the mixing at small scales. Special attention is paid to the closure of pressure fluctuating terms which appear in the turbulent transport equations. The proposed closure is able to take into account the counter-gradient di®usion and flame generated turbulence effects.
Numerical simulations are performed with the CFD code Code-Saturne and the model is validated using first the experimental configuration ORACLES from LCD and second the turbulent V-shaped flame studied at CORIA. Numerical results obtained for these two configurations are in good agreement with experimental data in both cases of perfectly and partially premixed turbulent reactive flows.
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Submitted on : Friday, February 22, 2008 - 1:55:04 PM
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Vincent Robin. Contribution à la modélisation des écoulements turbulent réactifs partiellement prémélangés. Energie électrique. Université de Poitiers; ENSMA, 2007. Français. ⟨tel-00258526⟩

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