[Structure des flammes étirées multidimensionnelles transcritiques]
Les flammes étirées sont courrament utilisées pour analyser la structure de couches réactives et déterminer les propriétés locales d'une combustion turbulente. Ce modèle est pratique car la structure des flammes étirées ne dépend que de la coordonnée transverse et peut être traitée comme un problème unidimensionnel. Cette configuration est envisagée ici dans un contexte multidimensionnel dans lequel l'écoulement étiré est obtenu par deux jets réactifs à contre-courant. Elle est utilisée ici pour examiner la structure de flammes transcritiques dans lesquelles un au moins un des réactifs est injecté à une pression supérieure à la valeur critique mais à une température inférieure à la température critique. Les calculs réalisés dans un domaine bidimensionnel permettent de tester des méthodes numériques développés pour la simulation multi-dimensionnelle de la combustion transcritique. Ces calculs permettent de valider une nouvelle version d'un code de calcul Navier–Stokes (AVBP) adaptée au calcul d'écoulements réactifs transcritiques typiques des conditions de fonctionnement des moteurs-fusées à propulsion liquide. La méthodologie de calcul de tels écoulements est décrite et les résultats obtenus montrent que les flammes étirées transcritiques possèdent les propriétés attendues en termes de structure et de réponse à l'étirement.
Strained flames are commonly used to study the structure of reactive layers and describe the local properties of turbulent combustion. This model is attractive because constant strain rate flames only depend on a transverse coordinate and can be treated as a one-dimensional problem. This configuration is considered in a multidimensional context in which the strained flow is obtained by two counterflowing streams of reactants. It is used to examine the structure of transcritical strained flames in which one or two reactants are injected at a high pressure exceeding the critical value while their temperature is below the critical value. Calculations are carried out in a two-dimensional domain to test numerical models developed for multidimensional simulations and test thermodynamic and transport models devised to deal with high pressure real gas effects. Multidimensional strained flame calculations carried out in this study serve to check the validity of a new version of a Navier–Stokes flow solver (AVBP) conceived to deal with transcritical combustion of interest to liquid propellant rocket applications. This article describes the basic elements of such simulations and discusses results of calculations. It is shown that the calculated multidimensional strained flames have the expected features in terms of structure and response to the imposed strain rate.
Mot clés : Combustion, Combustion transcritique, Flamme étirée, Haute pression
L. Pons 1 ; N. Darabiha 1 ; S. Candel 1, 2 ; T. Schmitt 3 ; B. Cuenot 3
@article{CRMECA_2009__337_6-7_517_0,
author = {L. Pons and N. Darabiha and S. Candel and T. Schmitt and B. Cuenot},
title = {The structure of multidimensional strained flames under transcritical conditions},
journal = {Comptes Rendus. M\'ecanique},
pages = {517--527},
publisher = {Elsevier},
volume = {337},
number = {6-7},
year = {2009},
doi = {10.1016/j.crme.2009.06.023},
language = {en},
}
TY - JOUR AU - L. Pons AU - N. Darabiha AU - S. Candel AU - T. Schmitt AU - B. Cuenot TI - The structure of multidimensional strained flames under transcritical conditions JO - Comptes Rendus. Mécanique PY - 2009 SP - 517 EP - 527 VL - 337 IS - 6-7 PB - Elsevier DO - 10.1016/j.crme.2009.06.023 LA - en ID - CRMECA_2009__337_6-7_517_0 ER -
%0 Journal Article %A L. Pons %A N. Darabiha %A S. Candel %A T. Schmitt %A B. Cuenot %T The structure of multidimensional strained flames under transcritical conditions %J Comptes Rendus. Mécanique %D 2009 %P 517-527 %V 337 %N 6-7 %I Elsevier %R 10.1016/j.crme.2009.06.023 %G en %F CRMECA_2009__337_6-7_517_0
L. Pons; N. Darabiha; S. Candel; T. Schmitt; B. Cuenot. The structure of multidimensional strained flames under transcritical conditions. Comptes Rendus. Mécanique, Volume 337 (2009) no. 6-7, pp. 517-527. doi : 10.1016/j.crme.2009.06.023. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2009.06.023/
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