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Flame dynamics during intermittency in a turbulent combustor
Published in Elsevier Ltd
2017
Volume: 36
   
Issue: 3
Pages: 3791 - 3798
Abstract
The dynamic characteristics of the intermittency exhibited by turbulent combustors using LPG as fuel before and after the occurrence of thermoacoustic instability were compared. The unsteady pressure fluctuations analysis suggested that the intermittency before and after thermoacoustic instability are of type II. The flame dynamics during either state were also compared through a high speed Mie scattering images acquired simultaneously with unsteady pressure. During both regimes of intermittency the flame switches between an oscillation where the flame oscillates in a periodic manner due to the inherent turbulent fluctuations and an oscillation where the flame exhibits periodic roll-up as a consequence of the periodic vortex shedding at the dump plane. The flame dynamics during intermittency before and after thermoacoustic instability varied. The flame along the inner shear layer was stabilized by the stagnation point flow behind the bluff body during intermittency before the occurrence of thermoacoustic instability while the flame along the inner shear layer was stabilized by the recirculation zone created by the bluff body during intermittency after the occurrence of thermoacoustic instability.
About the journal
JournalData powered by TypesetProceedings of the Combustion Institute
PublisherData powered by TypesetElsevier Ltd
ISSN15407489
Open AccessNo
Concepts (11)
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    Combustors
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    Dynamics
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    Shear flow
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    Stability
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    Thermoacoustics
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    Flame dynamics
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    Flow dynamics
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    Intermittency
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    Reactive
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    Turbulent combustion
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    Combustion