Comptes Rendus
no. 6-7
Chemical kinetics modeling and LES combustion model effects on a perfectly premixed burner
[Effets de la modélisation de la cinétique chimique et des modèles de combustion LES sur un brûleur parfaitement prémélangé]
Guillaume Albouze1  ; Thierry Poinsot2  ; Laurent Gicquel1
1 CERFACS, 42, avenue Coriolis, 31057 Toulouse, France
2 IMFT, Allée du professeur Camille Soula, 31400 Toulouse, France
Comptes Rendus. Mécanique, Volume 337 (2009) no. 6-7, pp. 318-328.

La modélisation de la cinétique chimique et le couplage avec les modèles de combustion turbulente pour la simulation aux grandes échelles doivent être maîtrisés pour garantir les prédictions d'écoulements de chambres de combustion. Deux modèles de combustion turbulente sont utilisés. Le premier repose sur une approche de PDF présumée couplée à une table chimique obtenue avec une schéma cinétique réduit. Le second modèle utilise l'approche de flamme épaissie et le même schéma cinétique réduit, mais dont les taux de réactions sont calculés explicitement. Puis, pour estimer les effets de réduction de cinétique chimique, le premier modèle est comparé à un troisième, avec la même approche PDF, mais couplée à une table obtenue avec un schéma cinétique complet. Des mesures expérimentales complètes (température et de fractions massiques des espèces) réalisées sur un brûleur prémélangé pauvre sont comparées aux résultats de simulation. Tous les résultats LES sont proches les uns des autres, la différence principale se trouvant sur les fractions massiques de CO.

Chemical kinetics modeling and coupling with turbulent combustion models for compressible Large Eddy Simulations (LES) is a critical issue. Accurate flow predictions can only be guaranteed if the coupling is well mastered. In a first attempt to qualify the effect of each model, the case of a lean premixed swirled combustor with comprehensive measures is targeted (species mass fractions and temperature fields). For the investigation, two turbulent combustion models are considered. The first model relies on a presumed PDF approach coupled to a look-up chemistry table obtained with a reduced chemical scheme. The second model makes use of the thickened flame approach using the same reduced chemical scheme but with reaction rates computed explicitly as the computation advances. Then, to estimate kinetic schemes reduction effects, the first model is compared to a third one, with the same PDF approach, but coupled to a look-up chemistry table obtained with a complete chemical scheme. All LES are very close to each other. The main difference between the different predictions relies on CO mass fractions. Although they are all able to return good outlet mass fractions, CO values inside the flame are different depending on the model used.

Publié le :
DOI : 10.1016/j.crme.2009.06.010
Keywords: Combustion, Chemical kinetics, LES combustion model
Mot clés : Combustion, Cinétique chimique, Modèle de combustion LES
Guillaume Albouze 1 ; Thierry Poinsot 2 ; Laurent Gicquel 1

1 CERFACS, 42, avenue Coriolis, 31057 Toulouse, France
2 IMFT, Allée du professeur Camille Soula, 31400 Toulouse, France 
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Guillaume Albouze; Thierry Poinsot; Laurent Gicquel. Chemical kinetics modeling and LES combustion model effects on a perfectly premixed burner. Comptes Rendus. Mécanique, Volume 337 (2009) no. 6-7, pp. 318-328. doi : 10.1016/j.crme.2009.06.010. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2009.06.010/

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