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ESTIMATE OF THE SUBGRID VARIANCE OF THE MIXTURE FRACTION IN SPRAY TURBULENT COMBUSTION

DOI: 10.1615/ICHMT.2008.CHT.1880
15 pages

Hicham Meftah
CORIA, University of Rouen, France; Ibn Zohr University, GEMS Laboratory, ENSA, B.P 1136, Agadir-Morocco

Julien Reveillon
CORIA UMR 6614, University of Rouen, Technopole du Madrillet, BP 12, 76801 Saint-Etienne-du-Rouvray Cedex, France

Francois-Xavier Demoulin
CORIA UMR 6614, University of Rouen, Technopole du Madrillet, BP 12, 76801 Saint-Etienne-du-Rouvray Cedex, France

Zakaria Bouali
UMR 6614 CNRS CORIA, Rouen University, bp 12−Site universitaire du Madrillet, 76801 St Etienne du Rouvray, France

Ahmed Mir
Laboratoire d'Ingénierie des Procédés, de l'Energie et de l'Environnement (LIP2E), Ecole Nationale des Sciences Appliquées, B.P. 1136, Agadir - Morocco

Abstrakt

Many industrial devices operate with turbulent combustion of an evaporating liquid phase. Progress in the design of such systems strongly relies on the accurate control of whole of the processes, starting from the injection of liquid fuel, evaporation and combustion. Depending on the chamber's geometry, the spray injection conditions and the mixing phenomena, various combustion regimes and flame structures may be observed, starting from premixed flames up to diffusion flames. However, partially premixed combustion is generally observed because of the triple interactions between spray, turbulence and combustion. The modeling of such chambers, involving the combustion of a two-phase flow or of a gaseous mixture released by the evaporation of a spray, is of primary importance to improve the output of the device considered and to predict pollutant formation while still maintaining a reasonable development cost. In this work we study the evolution of subgrid variance of mixture fraction and progress variable for the simulation of a spray turbulent combustion. We analyze the various terms of the equations, including the mass source terms due to the droplets evaporation. The coupling between the mixture fraction and progress variable equations and the propagating front flame is then analyzed. To do so a DNS of evaporating spray was carried out. The carrier phase is fully resolved; on the other hand a Lagrangian model was used for the dispersed phase.

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