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Influence of Heat Transfer and Material Temperature on Combustion Instabilities in a Swirl Burner

Kraus, Christian and Selle, Laurent and Poinsot, Thierry and Arndt, Christoph M. and Bockhorn, Henning Influence of Heat Transfer and Material Temperature on Combustion Instabilities in a Swirl Burner. (2016) Journal Of Engineering For Gas Turbines And Power, 139 (5). 051503/1-051503/10. ISSN 0742-4795

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Official URL: http://dx.doi.org/10.1115/1.4035143

Abstract

The current work focuses on the large eddy simulation (LES) of combustion instability in a laboratory-scale swirl burner. Air and fuel are injected at ambient conditions. Heat conduction from the combustion chamber to the plenums results in a preheating of the air and fuel flows above ambient conditions. The paper compares two computations: In the first computation, the temperature of the injected reactants is 300 K (equivalent to the experiment) and the combustor walls are treated as adiabatic. The frequency of the unstable mode ( 635 Hz) deviates significantly from the measured frequency ( 750 Hz). In the second computation, the preheating effect observed in the experiment and the heat losses at the combustion chamber walls are taken into account. The frequency ( 725 Hz) of the unstable mode agrees well with the experiment. These results illustrate the impor- tance of accounting for heat transfer/losses when applying LES for the prediction of com- bustion instabilities. Uncertainties caused by unsuitable modeling strategies when using computational fluid dynamics for the prediction of combustion instabilities can lead to an improper design of passive control methods (such as Helmholtz resonators) as these are often only effective in a limited frequency range.

Item Type:Article
Additional Information:Thanks to American Society of Mechanical Engineers editor. The original PDF of the article can be found at http://gasturbinespower.asmedigitalcollection.asme.org/article.aspx?articleid=2580911
HAL Id:hal-01688648
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)
Other partners > Universität Karlsruhe (GERMANY)
Other partners > Deutsches Zentrum für Luft- und Raumfahrt - DLR (GERMANY)
Laboratory name:
Funders:
European Research Council
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Deposited On:03 Jul 2017 11:48

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