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Acoustically Induced Flashback in a Staged Swirl-Stabilized Combustor

Lapeyre, Corentin J. and Mazur, Marek and Scouflaire, Philippe and Richecoeur, Franck and Ducruix, Sébastien and Poinsot, Thierry Acoustically Induced Flashback in a Staged Swirl-Stabilized Combustor. (2016) Flow Turbulence and Combustion, 97 (289). 1-18. ISSN 1386-6184

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Official URL: http://dx.doi.org/10.1007/s10494-016-9745-2

Abstract

This paper describes a joint experimental and numerical investigation of the inter- action between thermoacoustics and flashback mechanisms in a swirled turbulent burner. An academic air/propane combustor terminated by a choked nozzle is operated up to 2.5 bars. Experiments show that the flame can stabilize either within the combustion chamber or flashback inside the injection duct, intermittently or permanently. The present study focuses on the mechanisms leading to flashback: this phenomenon can occur naturally, depending on the swirl level which can be adjusted in the experiment by introducing axial flow through the upstream inlet. It can also be triggered by acoustic waves, either through acoustic forc- ing or self-excited thermoacoustic instability. Flashback is difficult to study experimentally, but it can be investigated numerically using LES: in a first configuration, the outlet of the chamber is treated as a non-reflecting surface through which harmonic waves can be intro- duced. In this case, a 20 kPa acoustic forcing is sufficient to trigger permanent flashback after a few cycles. When the LES computational domain includes the choked nozzle used experimentally, no forcing is needed for flashback to occur. Self-excited oscillations reach high levels rapidly, leading to flame flashback, as observed experimentally. These results also suggest a simple method to avoid flashback by using fuel staging, which is then tested successfully in both LES and experiments.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at : http://link.springer.com/ The original PDF of the article can be found at: http://link.springer.com/article/10.1007%2Fs10494-016-9745-2
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)
Other partners > Ecole Supérieure d'Electricité - SUPELEC (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:17 Jun 2016 08:54

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