Show simple item record

dc.contributor.authorGuiberti, Thibault
dc.contributor.authorBoyette, Wesley
dc.contributor.authorKrishna, Yedhu
dc.contributor.authorRoberts, William L.
dc.contributor.authorMasri, Assaad R.
dc.contributor.authorMagnotti, Gaetano
dc.date.accessioned2020-01-22T11:21:21Z
dc.date.available2020-01-22T11:21:21Z
dc.date.issued2020-01-22
dc.date.submitted2019-08-18
dc.identifier.citationGuiberti, T. F., Boyette, W. R., Krishna, Y., Roberts, W. L., Masri, A. R., & Magnotti, G. (2020). Assessment of the stabilization mechanisms of turbulent lifted jet flames at elevated pressure using combined 2-D diagnostics. Combustion and Flame, 214, 323–335. doi:10.1016/j.combustflame.2020.01.001
dc.identifier.doi10.1016/j.combustflame.2020.01.001
dc.identifier.urihttp://hdl.handle.net/10754/661124
dc.description.abstractThe stabilization mechanisms of turbulent lifted jet flames in a co-flow have been investigated at a pressure of 7 bar. The structure of the flame base was measured with combined OH and CH2O planar laser induced fluorescence (PLIF) and the spatial distribution of equivalence ratio was imaged, simultaneously, with CH4 Raman scattering. The velocity field was also measured with particle imaging velocimetry (PIV). Different bulk jet velocities Uj and co-flow velocities Uc were examined. Data show that flames with Uc = 0.6 m/s stabilize much further away from the nozzle than those with Uc = 0.3 m/s and that their structure does not resemble that of the edge-flames found closer to the nozzle. In addition, for Uc = 0.6 m/s, the measured lift-off height decreases with increasing bulk jet velocity, which is opposite to what is typically observed for lifted flames. Statistical examination of CH4 Raman images shows that the flames with Uc = 0.6 m/s propagate through regions of the flow where the equivalence ratio is not always stoichiometric but, instead, spans the whole flammability range. This is not consistent with edge-flames and is, instead, indicative of premixed burning. This is corroborated by PIV results which show that the flame base velocity exceeds that typically reported for edge-flames. Measurements of relevant flow properties were also conducted in non-reacting jets to predict the turbulent burning velocity of these lifted flames burning in a premixed mode. For Uc = 0.6 m/s and relatively large bulk jet velocities (Uj = 10 and 15 m/s), the predicted turbulent burning velocities are sufficiently high to counter the incoming flow of reactants and, in turn, allow flame stabilization. However, for a lower bulk jet velocity of Uj = 5 m/s, the predicted turbulent burning velocity is much less, leading to blow-out. This explains why the lift-off height decreases with increasing jet velocity for methane at 7 bar and Uc = 0.6 m/s. Data also shows that increasing pressure promotes transition from edge-flames to premixed flames due to reduced laminar burning velocity and enhanced mixing.
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). Prof. Masri is supported by the Australian Research Council (ARC-DP160105023).
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0010218020300031
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, [[Volume], [Issue], (2020-01-22)] DOI: 10.1016/j.combustflame.2020.01.001 . © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleAssessment of the stabilization mechanisms of turbulent lifted jet flames at elevated pressure using combined 2-D diagnostics
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmenthigh-pressure combustion (HPC) Research Group
dc.identifier.journalCombustion and Flame
dc.rights.embargodate2022-01-22
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionSchool of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia.
kaust.personGuiberti, Thibault
kaust.personBoyette, Wesley
kaust.personKrishna, Yedhu
kaust.personRoberts, William L.
kaust.personMagnotti, Gaetano
dc.date.accepted2010-01-01
refterms.dateFOA2020-01-22T11:22:45Z
dc.date.published-online2020-01-22
dc.date.published-print2020-04


Files in this item

Thumbnail
Name:
Accepted_CNF_S_19_00945_KAUST_Repository.pdf
Size:
1.502Mb
Format:
PDF
Description:
Published version
Embargo End Date:
2022-01-22

This item appears in the following Collection(s)

Show simple item record

NOTICE: 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, [[Volume], [Issue], (2020-01-22)] DOI: 10.1016/j.combustflame.2020.01.001 . © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Except where otherwise noted, this item's license is described as NOTICE: 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, [[Volume], [Issue], (2020-01-22)] DOI: 10.1016/j.combustflame.2020.01.001 . © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/