Effect of burner geometry on swirl stabilized methane/air flames: A joint LES/OH-PLIF/PIV study

Handle URI:
http://hdl.handle.net/10754/625658
Title:
Effect of burner geometry on swirl stabilized methane/air flames: A joint LES/OH-PLIF/PIV study
Authors:
Liu, X.; Elbaz, Ayman M.; Gong, C.; Bai, X.S.; Zheng, H.T.; Roberts, William L. ( 0000-0003-1999-2831 )
Abstract:
Large eddy simulation (LES) using a transported PDF model and OH-PLIF/PIV experiments were carried out to investigate the quarl effects on the structures of swirl stabilized methane/air flames. Two different quarls were investigated, one straight cylindrical quarl and one diverging conical quarl. The experiments show that the flames are significantly different with the two quarls. With the straight cylindrical quarl a compact blue flame is observed while with the diverging conical quarl the flame appears to be long and yellow indicating a sooty flame structure. The PIV results show the formation of a stronger flow recirculation inside the diverging conical quarl than that in the straight quarl. LES results reveal further details of the flow and mixing process inside the quarl. The results show that with the diverging quarl vortex breakdown occurs much earlier towards the upstream of the quarl. As a result the fuel is convected into the air flow tube and a diffusion flame is stabilized inside the air flow tube upstream the quarl. With the straight quarl, vortex breakdown occurs at a downstream location in the quarl. The scalar dissipation rate in the shear layer of the fuel jet is high, which prevents the stabilization of a diffusion flame in the proximity of the fuel nozzle; instead, a compact partially premixed flame with two distinct heat release layers is stablized in a downstream region in the quarl, which allows for the fuel and air to mix in the quarl before combustion and a lower formation rate of soot. The results showed that the Eulerian Stochastic Fields transported PDF method can well predict the details of the swirl flame dynamics.
KAUST Department:
Clean Combustion Research Center
Citation:
Liu X, Elbaz AM, Gong C, Bai XS, Zheng HT, et al. (2017) Effect of burner geometry on swirl stabilized methane/air flames: A joint LES/OH-PLIF/PIV study. Fuel 207: 533–546. Available: http://dx.doi.org/10.1016/j.fuel.2017.06.092.
Publisher:
Elsevier BV
Journal:
Fuel
Issue Date:
4-Jul-2017
DOI:
10.1016/j.fuel.2017.06.092
Type:
Article
ISSN:
0016-2361
Sponsors:
The experimental work was supported by competitive research funding from King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The LES work was partly sponsored by Swedish Research Council (VR), and the Swedish Energy Agency (STEM) through the National Center for Combustion Science and Technologies (CeCOST) and Lund University Competence Center for Combustion Process (KC-FP). X. Liu and C. Gong were sponsored by China Scholarship Council (CSC).
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0016236117307986
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorLiu, X.en
dc.contributor.authorElbaz, Ayman M.en
dc.contributor.authorGong, C.en
dc.contributor.authorBai, X.S.en
dc.contributor.authorZheng, H.T.en
dc.contributor.authorRoberts, William L.en
dc.date.accessioned2017-10-03T12:49:32Z-
dc.date.available2017-10-03T12:49:32Z-
dc.date.issued2017-07-04en
dc.identifier.citationLiu X, Elbaz AM, Gong C, Bai XS, Zheng HT, et al. (2017) Effect of burner geometry on swirl stabilized methane/air flames: A joint LES/OH-PLIF/PIV study. Fuel 207: 533–546. Available: http://dx.doi.org/10.1016/j.fuel.2017.06.092.en
dc.identifier.issn0016-2361en
dc.identifier.doi10.1016/j.fuel.2017.06.092en
dc.identifier.urihttp://hdl.handle.net/10754/625658-
dc.description.abstractLarge eddy simulation (LES) using a transported PDF model and OH-PLIF/PIV experiments were carried out to investigate the quarl effects on the structures of swirl stabilized methane/air flames. Two different quarls were investigated, one straight cylindrical quarl and one diverging conical quarl. The experiments show that the flames are significantly different with the two quarls. With the straight cylindrical quarl a compact blue flame is observed while with the diverging conical quarl the flame appears to be long and yellow indicating a sooty flame structure. The PIV results show the formation of a stronger flow recirculation inside the diverging conical quarl than that in the straight quarl. LES results reveal further details of the flow and mixing process inside the quarl. The results show that with the diverging quarl vortex breakdown occurs much earlier towards the upstream of the quarl. As a result the fuel is convected into the air flow tube and a diffusion flame is stabilized inside the air flow tube upstream the quarl. With the straight quarl, vortex breakdown occurs at a downstream location in the quarl. The scalar dissipation rate in the shear layer of the fuel jet is high, which prevents the stabilization of a diffusion flame in the proximity of the fuel nozzle; instead, a compact partially premixed flame with two distinct heat release layers is stablized in a downstream region in the quarl, which allows for the fuel and air to mix in the quarl before combustion and a lower formation rate of soot. The results showed that the Eulerian Stochastic Fields transported PDF method can well predict the details of the swirl flame dynamics.en
dc.description.sponsorshipThe experimental work was supported by competitive research funding from King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The LES work was partly sponsored by Swedish Research Council (VR), and the Swedish Energy Agency (STEM) through the National Center for Combustion Science and Technologies (CeCOST) and Lund University Competence Center for Combustion Process (KC-FP). X. Liu and C. Gong were sponsored by China Scholarship Council (CSC).en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0016236117307986en
dc.subjectPIV/OH-PLIFen
dc.subjectLESen
dc.subjectFlame structuresen
dc.subjectSwirl stabilized flamesen
dc.subjectBurner quarlen
dc.titleEffect of burner geometry on swirl stabilized methane/air flames: A joint LES/OH-PLIF/PIV studyen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalFuelen
dc.contributor.institutionCollege of Power and Energy Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, Chinaen
dc.contributor.institutionDivision of Fluid Mechanics, Lund University, 221 00, Swedenen
dc.contributor.institutionMechanical Power Engineering Department, Faculty of Engineering, Mataria, Helwan University, P.O. Box 11718, Egypten
kaust.authorElbaz, Ayman M.en
kaust.authorRoberts, William L.en
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