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LEAN PREMIXED TURBULENT COMBUSTION MODELING USING FLAME TABULATED CHEMISTRY AND A PRESUMED PDF APPROACH

Julien Savre
Department of Fundamental and Applied Energetics, ONERA 29, Avenue de la Division Leclerc, 92322 - Chatillon, France

Nicolas Bertier
Department of Fundamental and Applied Energetics, ONERA 29, Avenue de la Division Leclerc, 92322 - Chatillon, France

Daniel Gaffie
Department of Fundamental and Applied Energetics, ONERA 29, Avenue de la Division Leclerc, 92322 - Chatillon, France

Yves D'Angelo
Institut National des Sciences Appliquees, Complexe de Recherche Interprofessionnel en Aerothermochimie. INSA/CORIA CNRS UMR 6614, 76801 St Etienne du Rouvray, Rouen, France

Abstract

A tabulated chemistry approach (FPI) is used within an LES context to compute the turbulent reacting flow inside a lean premixed swirl-burner. Chemical informations such as species reaction rates and species mass fractions are directly interpolated in the chemical database as a function of a unique progress variable. Furthermore, the effects of SGS fluctuations on the flame are accounted for using a presumed PDF approach (β-PDF), valid in the thin reaction zone regime. The evaluation of those PDFs requires the knowledge of the first two statistical moments of the progress variable (those two variables have thus to be modeled). The flow inside the model combustor is eventually successfully computed, and the profiles of averaged and RMS quantities are compared to experimental measurements. Using those comparisons, the ability of the model to predict pollutant species formation such as CO and CO2 is assessed, and possible improvements of the model are discussed.