Comptes Rendus
Progress and challenges in swirling flame dynamics
Comptes Rendus. Mécanique, Volume 340 (2012) no. 11-12, pp. 758-768.

In many continuous combustion processes the flame is stabilized by swirling the injected flow. This is the case for example in aeroengine combustors or in gas turbines where aerodynamic injectors impart a rotating component to the flow to create a central recirculation zone which anchors the flame. Swirling flame dynamics is of technical interest and also gives rise to interesting scientific issues. Some of the recent progress in this field will be reviewed. It is first shown that the swirler response to incident acoustic perturbations generates a vorticity wave which is convected by the flow. A result of this process is that the swirl number fluctuates. It is then shown that the flame response is defined by a combination of heat release rate fluctuations induced by the incoming acoustic and convective perturbations. This is confirmed by experimental measurements and by large eddy simulations of the reactive flow. Measured flame describing functions (FDFs) are then used to characterize the nonlinear response of swirling flames to incident perturbations and determine the regimes of instability of a generic system comprising an upstream manifold, an injector equipped with a swirler and a combustion chamber confining the flame. The last part of this article is concerned with interactions of the precessing vortex core (PVC) with incoming acoustic perturbations. The PVC is formed at high swirl number and this hydrodynamic helical instability gives rise to some interesting nonlinear interactions between the acoustic frequency, the PVC frequency and their difference frequency.

Published online:
DOI: 10.1016/j.crme.2012.10.024
Keywords: Combustion dynamics, Swirling flames, Flame describing function, Swirl fluctuations

Sébastien Candel 1, 2; Daniel Durox 1, 2; Thierry Schuller 1, 2; Paul Palies 1, 2; Jean-François Bourgouin 1, 2, 3; Jonas P. Moeck 4

1 CNRS, UPR 288, Laboratoire dʼénergétique moléculaire et macroscopique combustion (EM2C), 92295 Châtenay-Malabry, France
2 Ecole Centrale Paris, 92295 Châtenay-Malabry, France
3 SNECMA (Safran Group), Centre de Villaroche, 77550 Moissy-Cramayel, France
4 Institut für Strömungsmechanik und Technische Akustik, Technische Universität Berlin, 10623 Berlin, Germany
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Sébastien Candel; Daniel Durox; Thierry Schuller; Paul Palies; Jean-François Bourgouin; Jonas P. Moeck. Progress and challenges in swirling flame dynamics. Comptes Rendus. Mécanique, Volume 340 (2012) no. 11-12, pp. 758-768. doi : 10.1016/j.crme.2012.10.024. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2012.10.024/

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