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Sensitivity of LES-based harmonic flame response model for turbulent swirled flames and impact on the stability of azimuthal modes

Bauerheim, Michaël and Staffelbach, Gabriel and Worth, Nick A. and Dawson, James and Gicquel, Laurent Y.M. and Poinsot, Thierry Sensitivity of LES-based harmonic flame response model for turbulent swirled flames and impact on the stability of azimuthal modes. (2015) Proceedings of the Combustion Institute, vol. 35 (n° 3). pp. 3355-3363. ISSN 1540-7489

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Official URL: http://dx.doi.org/10.1016/j.proci.2014.07.021

Abstract

This paper describes a numerical study of azimuthal unstable modes in the annular combustor of Cambridge. LES is used to compute Flame Transfer Functions (FTF) and a Helmholtz solver to predict the overall stability of the combustor. FTF quantify the interaction between acoustics and the turbulent swirled flames. They must be known with precision because instabilities are very sensitive to subtle changes. The effects of azimuthal confinement (corresponding to the annular combustor equipped with 12 or 18 burners), thermal boundary conditions and fuel type (methane or ethylene) on FTFs are simulated here using LES of a single 20 degree (N = 18) or 30 degree (N = 18) sector. A double-sector LES is also computed to investigate flame / flame interactions. These LES-based FTFs are then used as inputs for a Helmholtz solver and results show that 1) subgrid-scale LES models lead to marginal effects on FTF while 2) azimuthal confinement, thermal conditions and fuel type strongly affect the flame response to acoustics and therefore control the stability of the azimuthal mode. Computations show that the annular experiment performed with methane

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Thermochimica Acta website : http://www.sciencedirect.com/science/journal/00406031
HAL Id:hal-01116162
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Norwegian University of Science and Technology - NTNU (NORWAY)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Société nationale d'étude et de constructions de moteurs d'avion - SNECMA (FRANCE)
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Deposited By: Thierry POINSOT
Deposited On:12 Feb 2015 15:54

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