Comptes Rendus
Dynamics of premixed confined swirling flames
Comptes Rendus. Mécanique, Volume 337 (2009) no. 6-7, pp. 395-405.

Considerable effort is currently being extended to examine the fundamental mechanisms of combustion instabilities and develop methods allowing predictions of these phenomena. One central aspect of this problem is the dynamical response of the flame to incoming perturbations. This question is examined in the present article, which specifically considers the response of premixed swirling flames to perturbations imposed on the upstream side of the flame in the feeding manifold. The flame response is characterized by measuring the unsteady heat release induced by imposed velocity perturbations. A flame describing function is defined by taking the ratio of the relative heat release rate fluctuation to the relative velocity fluctuation. This quantity is determined for a range of frequencies and for different levels of incoming velocity perturbations. The flame dynamics is also documented by calculating conditional phase averages of the light emission from the flame and taking the Abel transform of these average images to obtain the flame geometry at various instants during the cycle of oscillation. These data can be useful to the determination of possible regimes of instability.

Un effort de recherche important est actuellement effectué pour comprendre les mćanismes fondamentaux qui contrôlent les instabilitś de combustion et pour développer des méthodes permettant de prévoir ces phénomènes. Un aspect central de ce probléme est la réponse dynamique des flammes à des perturbations amont. Cette question est abordé dans cet article qui considère spécifiquement la réponse de flammes prémélangées et swirlées à des perturbations de vitesse imposées en amont du brûleur. Cette réponse de flamme est caractérisée par la mesure du taux de dégagement de chaleur de la flamme induit par les perturbations de vitesses. Une fonction de transfert généralisée (FDF pour “Flame Describing Function”) est alors définie en prenant le rapport du dégagement de chaleur relatif et de la fluctuation de vitesse relative. Cette quantité est déterminé pour une gamme de fréquence et pour plusieurs amplitudes de la fluctuation de vitesse. La dynamique de flamme est aussi étudiée à l'aide des images d'émission moyennes conditionnées par la phase et traitées par transformé d'Abel pour obtenir la géométrie de la flamme à différents instants du cycle d'excitation. L'ensemble de ces résultats peuvent être utiles à la détermination des régimes d'instabilités possibles.

Published online:
DOI: 10.1016/j.crme.2009.06.001
Keywords: Combustion, Swirl, Flame describing function, Acoustic coupling, Confinement
Mot clés : Combustion, Swirl, Fonction de transfert généralisés, Couplage acoustique, Confinement

P. Palies 1; D. Durox 1; T. Schuller 1; P. Morenton 2; S. Candel 1, 3

1 Laboratoire EM2C CNRS, École centrale Paris, grande voie des vignes, 92295 Châtenay Malabry, France
2 Laboratoire génie industriel, École centrale Paris, grande voie des vignes, 92295 Châtenay Malabry, France
3 Institut Universitaire de France
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P. Palies; D. Durox; T. Schuller; P. Morenton; S. Candel. Dynamics of premixed confined swirling flames. Comptes Rendus. Mécanique, Volume 337 (2009) no. 6-7, pp. 395-405. doi : 10.1016/j.crme.2009.06.001. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2009.06.001/

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