In earlier experimental studies of the authors a previously unknown mechanism leading to flame flashback—combustion induced vortex breakdown (CIVB)—was discovered in premixed swirl burners. It exhibits the sudden formation of a recirculation bubble in vortical flows, which propagates upstream into the mixing zone after the equivalence ratio has exceeded a critical value. This bubble then stabilizes the chemical reaction and causes overheat with subsequent damage to the combustion system. Although it was shown earlier that the sudden change of the macroscopic character of the vortex flow leading to flashback can be qualitatively computed with three-dimensional as well as axisymmetric two-dimensional URANS-codes, the proper prediction of the flashback limits could not be achieved with this approach. For the first time, the paper shows quantitative predictions using a modified code with a combustion model, which covers the interaction of chemistry with vortex dynamics properly. Since the root cause for the macroscopic breakdown of the flow could not be explained on the basis of experiments or CFD results in the past, the vorticity transport equation is employed in the paper for the analysis of the source terms of the azimuthal component using the data delivered by the URANS-model. The analysis reveals that CIVB is initiated by the baroclinic torque in the flame and it is shown that CIVB is essentially a two-dimensional effect. As the most critical zone, the upstream part of the bubble was identified. The location and distribution of the heat release in this zone governs whether or not a flow field is prone to CIVB.
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October 2007
Technical Papers
Analysis of Combustion Induced Vortex Breakdown Driven Flame Flashback in a Premix Burner With Cylindrical Mixing Zone
F. Kiesewetter,
F. Kiesewetter
Lehrstuhl für Thermodynamik,
Technische Unversität München
, D-85748 Garching, Germany
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M. Konle,
M. Konle
Lehrstuhl für Thermodynamik,
e-mail: konle@td.mw.tum.de
Technische Unversität München
, D-85748 Garching, Germany
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T. Sattelmayer
T. Sattelmayer
Lehrstuhl für Thermodynamik,
Technische Unversität München
, D-85748 Garching, Germany
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F. Kiesewetter
Lehrstuhl für Thermodynamik,
Technische Unversität München
, D-85748 Garching, Germany
M. Konle
Lehrstuhl für Thermodynamik,
Technische Unversität München
, D-85748 Garching, Germanye-mail: konle@td.mw.tum.de
T. Sattelmayer
Lehrstuhl für Thermodynamik,
Technische Unversität München
, D-85748 Garching, GermanyJ. Eng. Gas Turbines Power. Oct 2007, 129(4): 929-936 (8 pages)
Published Online: April 3, 2007
Article history
Received:
June 7, 2006
Revised:
April 3, 2007
Citation
Kiesewetter, F., Konle, M., and Sattelmayer, T. (April 3, 2007). "Analysis of Combustion Induced Vortex Breakdown Driven Flame Flashback in a Premix Burner With Cylindrical Mixing Zone." ASME. J. Eng. Gas Turbines Power. October 2007; 129(4): 929–936. https://doi.org/10.1115/1.2747259
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