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Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers

Wolf, Pierre and Balakrishnan, Ramesh and Staffelbach, Gabriel and Gicquel, Laurent Y.M. and Poinsot, Thierry Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers. (2012) Flow, Turbulence and Combustion, vol. 88 (n° 1-2). pp. 191-206. ISSN 1386-6184

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Official URL: http://dx.doi.org/10.1007/s10494-011-9367-7

Abstract

Great prominence is put on the design of aeronautical gas turbines due to increasingly stringent regulations and the need to tackle rising fuel prices. This drive towards innovation has resulted sometimes in new concepts being prone to combustion instabilities. In the particular field of annular combustion chambers, these instabilities often take the form of azimuthal modes. To predict these modes, one must compute the full combustion chamber, which remained out of reach until very recently and the development of massively parallel computers. Since one of the most limiting factors in performing Large Eddy Simulation (LES) of real combustors is estimating the adequate grid, the effects of mesh resolution are investigated by computing full annular LES of a realistic helicopter combustion chamber on three grids, respectively made of 38, 93 and 336 million elements. Results are compared in terms of mean and fluctuating fields. LES captures self-established azimuthal modes. The presence and structure of the modes is discussed. This study therefore highlights the potential of LES for studying combustion instabilities in annular gas turbine combustors.

Item Type:Article
Additional Information:Thanks to Springer editor. The original publication is available at www.springerlink.com
HAL Id:hal-00812024
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)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > United States Department of Energy (USA)
Other partners > University of Chicago (USA)
Laboratory name:
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Deposited By: Thierry POINSOT
Deposited On:22 Mar 2013 10:56

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