Comptes Rendus
Combustion, flow and spray dynamics for aerospace propulsion
Numerical investigation of a helicopter combustion chamber using LES and tabulated chemistry
Comptes Rendus. Mécanique, Volume 341 (2013) no. 1-2, pp. 257-265.

This article presents Large Eddy Simulations (LES) of a realistic aeronautical combustor device: the chamber CTA1 designed by TURBOMECA. Under nominal operating conditions, experiments show hot spots observed on the combustor walls, in the vicinity of the injectors. These high temperature regions disappear when modifying the fuel stream equivalence ratio.

In order to account for detailed chemistry effects within LES, the numerical simulation uses the recently developed turbulent combustion model F-TACLES (Filtered TAbulated Chemistry for LES). The principle of this model is first to generate a lookup table where thermochemical variables are computed from a set of filtered laminar unstrained premixed flamelets. To model the interactions between the flame and the turbulence at the subgrid scale, a flame wrinkling analytical model is introduced and the Filtered Density Function (FDF) of the mixture fraction is modeled by a β function. Filtered thermochemical quantities are stored as a function of three coordinates: the filtered progress variable, the filtered mixture fraction and the mixture fraction subgrid scale variance. The chemical lookup table is then coupled with the LES using a mathematical formalism that ensures an accurate prediction of the flame dynamics. The numerical simulation of the CTA1 chamber with the F-TACLES turbulent combustion model reproduces fairly the temperature fields observed in experiments. In particular the influence of the fuel stream equivalence ratio on the flame position is well captured.

Published online:
DOI: 10.1016/j.crme.2012.10.021
Keywords: Turbulent combustion modeling, Large Eddy Simulation, Tabulated chemistry

Pierre Auzillon 1, 2; Eléonore Riber 3; Laurent Y.M. Gicquel 3; Olivier Gicquel 1, 2; Nasser Darabiha 1, 2; Denis Veynante 1, 2; Benoît Fiorina 1, 2

1 CNRS, UPR 288, Laboratoire dʼénergétique moléculaire et macroscopique, combustion (EM2C), grande voie des vignes, 92290 Châtenay-Malabry, France
2 École centrale Paris, grande voie des vignes, 92290 Châtenay-Malabry, France
3 CERFACS, CFD Team, 42, avenue G. Coriolis, 31057 Toulouse cedex 01, France
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     journal = {Comptes Rendus. M\'ecanique},
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Pierre Auzillon; Eléonore Riber; Laurent Y.M. Gicquel; Olivier Gicquel; Nasser Darabiha; Denis Veynante; Benoît Fiorina. Numerical investigation of a helicopter combustion chamber using LES and tabulated chemistry. Comptes Rendus. Mécanique, Volume 341 (2013) no. 1-2, pp. 257-265. doi : 10.1016/j.crme.2012.10.021. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2012.10.021/

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