Characterization of the coherent structures in swirling flames stabilized in a two-staged multi-injection burner: Influence of the staging factor

Theodore Providakis; Laurent Zimmer; Philippe Scouflaire; Sébastien Ducruix

doi:10.1016/j.crme.2012.10.010

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 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

Comptes Rendus. Mécanique, Combustion, spray and flow dynamics for aerospace propulsion, Volume 341 (2013) no. 1-2, pp. 4-14.

Résumé
Abstract

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 : 2013-01-01

DOI : 10.1016/j.crme.2012.10.010

Keywords: Combustion, Swirling flame, Staging factor
Mots-clés : Combustion, Flamme swirlée, Étagement

Affiliations des auteurs :

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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     author = {Theodore Providakis and Laurent Zimmer and Philippe Scouflaire and S\'ebastien Ducruix},
     title = {Characterization of the coherent structures in swirling flames stabilized in a two-staged multi-injection burner: {Influence} of the staging factor},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {4--14},
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     doi = {10.1016/j.crme.2012.10.010},
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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, Combustion, spray and flow dynamics for aerospace propulsion, 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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