Comptes Rendus
no. 1-2
Combustion, flow and spray dynamics for aerospace propulsion
Characterization of the coherent structures in swirling flames stabilized in a two-staged multi-injection burner: Influence of the staging factor
[Caractérisation des structures cohérentes dans des flammes swirlées dans un injecteur multipoint étagé : Influence de lʼétagement]
Theodore Providakis1, 2  ; Laurent Zimmer1, 2  ; Philippe Scouflaire1, 2  ; Sébastien Ducruix1, 2
1 CNRS, UPR 288, Laboratoire EM2C, 92290 Châtenay-Malabry, France
2 École Centrale Paris, 92290 Châtenay-Malabry, France
Comptes Rendus. Mécanique, Volume 341 (2013) no. 1-2, pp. 4-14.

Les injecteurs multipoints étagés semblent de bons candidats pour faire face aux problèmes de stabilité de flamme (instabilités de combustion, flashback, extinction de flamme) rencontrés dans les brûleurs à combustion prémélangée prévaporisée pauvre. Les procédures dʼétagement permettent de contrôler la distribution de carburant tandis que lʼinjection multipoint peut conduire à un mélange plus rapide et plus efficace. Dans cette étude un injecteur multipoint étagé à échelle de laboratoire est caractérisé à lʼaide de la Vélocimétrie par Image de Particules à haute cadence et la Fluorescence Induite par Laser. Les résultats montrent que les processus de stabilisation de flamme sont fortement influencés par la distribution de carburant, conduisant à des instabilités thermo-acoustiques plus ou moins élevées. Par ailleurs, les résultats révèlent la présence dʼune structure aerodynamique en précession, qui, sous certaines conditions, améliore la stabilisation de la flamme.

Staged multi-injection combustors seem good candidates to face flame stabilization problems (combustion instabilities, flashback, flame extinction), encountered in lean premixed prevaporized (LPP) burners. Staging procedures enable fuel distribution control while multipoint injection can lead to a fast and efficient mixing. In the present study, a laboratory-scale staged multipoint combustor is characterized using High Speed Particle Image Velocimetry and Planar Laser Induced Fluorescence measurements. It is shown that the fuel distribution strongly affects the flame stabilization processes, modifying the thermo-acoustic coupling. Furthermore, results reveal the presence of a precessing vortex core (PVC), that can lead to a better flame stabilization in particular cases.

Publié le :
DOI : 10.1016/j.crme.2012.10.010
Keywords: Combustion, Swirling flame, Staging factor
Mot clés : Combustion, Flamme swirlée, Étagement
Theodore Providakis 1, 2 ; Laurent Zimmer 1, 2 ; Philippe Scouflaire 1, 2 ; Sébastien Ducruix 1, 2

1 CNRS, UPR 288, Laboratoire EM2C, 92290 Châtenay-Malabry, France
2 École Centrale Paris, 92290 Châtenay-Malabry, France 
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     journal = {Comptes Rendus. M\'ecanique},
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Theodore Providakis; Laurent Zimmer; Philippe Scouflaire; Sébastien Ducruix. Characterization of the coherent structures in swirling flames stabilized in a two-staged multi-injection burner: Influence of the staging factor. Comptes Rendus. Mécanique, Volume 341 (2013) no. 1-2, pp. 4-14. doi : 10.1016/j.crme.2012.10.010. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2012.10.010/

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