Stabilization and structure of n-heptane tribrachial flames in axisymmetric laminar jets

Handle URI:
http://hdl.handle.net/10754/566169
Title:
Stabilization and structure of n-heptane tribrachial flames in axisymmetric laminar jets
Authors:
Bisetti, Fabrizio ( 0000-0001-5162-7805 ) ; Sarathy, Mani ( 0000-0002-3975-6206 ) ; Toma, Milan; Chung, Suk-Ho ( 0000-0001-8782-312X )
Abstract:
A set of tribrachial flames of n-heptane/air is simulated with finite rate chemistry and detailed transport in a realistic laminar jet configuration for which experimental data are available. The flames differ by the temperature of the unburnt mixture and stabilization height, which controls the mixture fraction gradient ahead of the flame front. The simulations reproduce the lift-off heights in the experiments, showing that the flame stabilizes further downstream as the unburnt temperature decreases. For the lowest unburnt temperature, resulting in a weak mixture fraction gradient at the tribrachial point, positive stretch along the rich premixed wing leads to an increase in the rate of chemical reaction in the whole flame. The tribrachial flame burning velocity exceeds that in the unstretched, one-dimensional flame. For the highest temperature, the flame stabilizes closest to the nozzle. Large flame tilt, large mixture fraction gradient, and small radius of curvature lead to a reduction in the heat release rate and the flame propagates slower than its one-dimensional counterpart. The observed behavior is explained with a detailed analysis of the flame geometry, differential diffusion effects, flame stretch, and transport of heat and mass from the burnt gases to the flame front. © 2014 The Combustion Institute.
KAUST Department:
Clean Combustion Research Center
Publisher:
Elsevier BV
Journal:
Proceedings of the Combustion Institute
Issue Date:
2015
DOI:
10.1016/j.proci.2014.06.077
Type:
Article
ISSN:
15407489
Sponsors:
The research reported in this publication was supported by Saudi Aramco and by King Abdullah University of Science and Technology (KAUST).
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorBisetti, Fabrizioen
dc.contributor.authorSarathy, Manien
dc.contributor.authorToma, Milanen
dc.contributor.authorChung, Suk-Hoen
dc.date.accessioned2015-08-12T09:30:55Zen
dc.date.available2015-08-12T09:30:55Zen
dc.date.issued2015en
dc.identifier.issn15407489en
dc.identifier.doi10.1016/j.proci.2014.06.077en
dc.identifier.urihttp://hdl.handle.net/10754/566169en
dc.description.abstractA set of tribrachial flames of n-heptane/air is simulated with finite rate chemistry and detailed transport in a realistic laminar jet configuration for which experimental data are available. The flames differ by the temperature of the unburnt mixture and stabilization height, which controls the mixture fraction gradient ahead of the flame front. The simulations reproduce the lift-off heights in the experiments, showing that the flame stabilizes further downstream as the unburnt temperature decreases. For the lowest unburnt temperature, resulting in a weak mixture fraction gradient at the tribrachial point, positive stretch along the rich premixed wing leads to an increase in the rate of chemical reaction in the whole flame. The tribrachial flame burning velocity exceeds that in the unstretched, one-dimensional flame. For the highest temperature, the flame stabilizes closest to the nozzle. Large flame tilt, large mixture fraction gradient, and small radius of curvature lead to a reduction in the heat release rate and the flame propagates slower than its one-dimensional counterpart. The observed behavior is explained with a detailed analysis of the flame geometry, differential diffusion effects, flame stretch, and transport of heat and mass from the burnt gases to the flame front. © 2014 The Combustion Institute.en
dc.description.sponsorshipThe research reported in this publication was supported by Saudi Aramco and by King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.subjectDifferential diffusionen
dc.subjectFlame stretchen
dc.subjectLifted flameen
dc.subjectn-Heptaneen
dc.subjectTribrachial flameen
dc.titleStabilization and structure of n-heptane tribrachial flames in axisymmetric laminar jetsen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalProceedings of the Combustion Instituteen
kaust.authorBisetti, Fabrizioen
kaust.authorSarathy, Manien
kaust.authorToma, Milanen
kaust.authorChung, Suk-Hoen
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