A flame particle tracking analysis of turbulence–chemistry interaction in hydrogen–air premixed flames

Handle URI:
http://hdl.handle.net/10754/583294
Title:
A flame particle tracking analysis of turbulence–chemistry interaction in hydrogen–air premixed flames
Authors:
Uranakara, Harshavardhana A.; Chaudhuri, Swetaprovo; Dave, Himanshu L.; Arias, Paul G.; Im, Hong G. ( 0000-0001-7080-1266 )
Abstract:
Interactions of turbulence, molecular transport, and energy transport, coupled with chemistry play a crucial role in the evolution of flame surface geometry, propagation, annihilation, and local extinction/re-ignition characteristics of intensely turbulent premixed flames. This study seeks to understand how these interactions affect flame surface annihilation of lean hydrogen–air premixed turbulent flames. Direct numerical simulations (DNSs) are conducted at different parametric conditions with a detailed reaction mechanism and transport properties for hydrogen–air flames. Flame particle tracking (FPT) technique is used to follow specific flame surface segments. An analytical expression for the local displacement flame speed (Sd) of a temperature isosurface is considered, and the contributions of transport, chemistry, and kinematics on the displacement flame speed at different turbulence-flame interaction conditions are identified. In general, the displacement flame speed for the flame particles is found to increase with time for all conditions considered. This is because, eventually all flame surfaces and their resident flame particles approach annihilation by reactant island formation at the end of stretching and folding processes induced by turbulence. Statistics of principal curvature evolving in time, obtained using FPT, suggest that these islands are ellipsoidal on average enclosing fresh reactants. Further examinations show that the increase in Sd is caused by the increased negative curvature of the flame surface and eventual homogenization of temperature gradients as these reactant islands shrink due to flame propagation and turbulent mixing. Finally, the evolution of the normalized, averaged, displacement flame speed vs. stretch Karlovitz number are found to collapse on a narrow band, suggesting that a unified description of flame speed dependence on stretch rate may be possible in the Lagrangian description.
KAUST Department:
Clean Combustion Research Center
Citation:
A flame particle tracking analysis of turbulence–chemistry interaction in hydrogen–air premixed flames 2015 Combustion and Flame
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
21-Nov-2015
DOI:
10.1016/j.combustflame.2015.09.033
Type:
Article
ISSN:
00102180
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0010218015003466
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorUranakara, Harshavardhana A.en
dc.contributor.authorChaudhuri, Swetaprovoen
dc.contributor.authorDave, Himanshu L.en
dc.contributor.authorArias, Paul G.en
dc.contributor.authorIm, Hong G.en
dc.date.accessioned2015-12-06T08:42:34Zen
dc.date.available2015-12-06T08:42:34Zen
dc.date.issued2015-11-21en
dc.identifier.citationA flame particle tracking analysis of turbulence–chemistry interaction in hydrogen–air premixed flames 2015 Combustion and Flameen
dc.identifier.issn00102180en
dc.identifier.doi10.1016/j.combustflame.2015.09.033en
dc.identifier.urihttp://hdl.handle.net/10754/583294en
dc.description.abstractInteractions of turbulence, molecular transport, and energy transport, coupled with chemistry play a crucial role in the evolution of flame surface geometry, propagation, annihilation, and local extinction/re-ignition characteristics of intensely turbulent premixed flames. This study seeks to understand how these interactions affect flame surface annihilation of lean hydrogen–air premixed turbulent flames. Direct numerical simulations (DNSs) are conducted at different parametric conditions with a detailed reaction mechanism and transport properties for hydrogen–air flames. Flame particle tracking (FPT) technique is used to follow specific flame surface segments. An analytical expression for the local displacement flame speed (Sd) of a temperature isosurface is considered, and the contributions of transport, chemistry, and kinematics on the displacement flame speed at different turbulence-flame interaction conditions are identified. In general, the displacement flame speed for the flame particles is found to increase with time for all conditions considered. This is because, eventually all flame surfaces and their resident flame particles approach annihilation by reactant island formation at the end of stretching and folding processes induced by turbulence. Statistics of principal curvature evolving in time, obtained using FPT, suggest that these islands are ellipsoidal on average enclosing fresh reactants. Further examinations show that the increase in Sd is caused by the increased negative curvature of the flame surface and eventual homogenization of temperature gradients as these reactant islands shrink due to flame propagation and turbulent mixing. Finally, the evolution of the normalized, averaged, displacement flame speed vs. stretch Karlovitz number are found to collapse on a narrow band, suggesting that a unified description of flame speed dependence on stretch rate may be possible in the Lagrangian description.en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0010218015003466en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Combustion and Flame. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Combustion and Flame, 21 November 2015. DOI: 10.1016/j.combustflame.2015.09.033en
dc.subjectDirect numerical simulationen
dc.subjectTurbulent premixed flamesen
dc.subjectDisplacement flame speeden
dc.subjectFlame particle trackingen
dc.titleA flame particle tracking analysis of turbulence–chemistry interaction in hydrogen–air premixed flamesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalCombustion and Flameen
dc.eprint.versionPost-printen
dc.contributor.institutionDepartment of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, Indiaen
dc.contributor.institutionNational Center for Combustion Research and Development, Indian Institute of Science, Bangalore 560012, Indiaen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorArias, Paul G.en
kaust.authorIm, Hong G.en
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