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DNS of Intrinsic ThermoAcoustic modes in laminar premixed flames

Courtine, Emilien and Selle, Laurent and Poinsot, Thierry DNS of Intrinsic ThermoAcoustic modes in laminar premixed flames. (2015) Combustion and Flame, 162 (11). 4331-4341. ISSN 0010-2180

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Official URL: http://dx.doi.org/10.1016/j.combustflame.2015.07.002

Abstract

Recent studies [Hoeijmakers et al. 2014, Emmert et al. 2015] suggest that thermoacoustic modes can appear in combustors with anechoic terminations, which have no acoustic eigenmodes. These modes, called here Intrinsic ThermoAcoustic (ITA), can be predicted with simple theoretical arguments, but have been ignored for a long time. They are reproduced in this paper using Direct Numerical Simulation (DNS) of a laminar premixed Bunsen type flame. DNS results and theory are compared showing very good agreement in terms of both frequency and mode structure. DNS confirms that the frequency of ITA modes does not depend on any acoustic characteristic of the burner. Based on a numerical evaluation of the Flame Transfer Function, stability limits of ITA modes predicted by theory are also recovered in the DNS with reasonable accuracy. Finally, DNS is used to analyze the mechanisms of ITA modes.

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 Combustion and Flame website : http://dx.doi.org/10.1016/j.combustflame.2015.07.002
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 - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Funders:
European Commission - CINES (France)
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Deposited On:30 Nov 2015 10:10

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