The flow field structure of highly stabilized partially premixed flames in a concentric flow conical nozzle burner with coflow

Handle URI:
http://hdl.handle.net/10754/576858
Title:
The flow field structure of highly stabilized partially premixed flames in a concentric flow conical nozzle burner with coflow
Authors:
Elbaz, Ayman M.; Zayed, M.F.; Samy, M.; Roberts, William L. ( 0000-0003-1999-2831 ) ; Mansour, Mohy S.
Abstract:
The stability limits, the stabilization mechanism, and the flow field structure of highly stabilized partially premixed methane flames in a concentric flow conical nozzle burner with air co-flow have been investigated and presented in this work. The stability map of partial premixed flames illustrates that the flames are stable between two extinction limits. A low extinction limit when partial premixed flames approach non-premixed flame conditions, and a high extinction limit, with the partial premixed flames approach fully premixed flame conditions. These two limits showed that the most stable flame conditions are achieved at a certain degree of partial premixed. The stability is improved by adding air co-flow. As the air co-flow velocity increases the most stable flames are those that approach fully premixed. The turbulent flow field of three flames at 0, 5, 10 m/s co-flow velocity are investigated using Stereo Particle Image Velocimetry (SPIV) in order to explore the improvement of the flame stability due to the use of air co-flow. The three flames are all at a jet equivalence ratio (Φj) of 2, fixed level of partial premixing and jet Reynolds number (Rej) of 10,000. The use of co-flow results in the formation of two vortices at the cone exit. These vortices act like stabilization anchors for the flames to the nozzle tip. With these vortices in the flow field, the reaction zone shifts toward the reduced turbulence intensity at the nozzle rim of the cone. Interesting information about the structure of the flow field with and without co-flow are identified and reported in this work.
KAUST Department:
Clean Combustion Research Center
Citation:
The flow field structure of highly stabilized partially premixed flames in a concentric flow conical nozzle burner with coflow 2015 Experimental Thermal and Fluid Science
Publisher:
Elsevier BV
Journal:
Experimental Thermal and Fluid Science
Issue Date:
29-Aug-2015
DOI:
10.1016/j.expthermflusci.2015.08.016
Type:
Article
ISSN:
08941777
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0894177715002277
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorElbaz, Ayman M.en
dc.contributor.authorZayed, M.F.en
dc.contributor.authorSamy, M.en
dc.contributor.authorRoberts, William L.en
dc.contributor.authorMansour, Mohy S.en
dc.date.accessioned2015-09-07T06:56:41Zen
dc.date.available2015-09-07T06:56:41Zen
dc.date.issued2015-08-29en
dc.identifier.citationThe flow field structure of highly stabilized partially premixed flames in a concentric flow conical nozzle burner with coflow 2015 Experimental Thermal and Fluid Scienceen
dc.identifier.issn08941777en
dc.identifier.doi10.1016/j.expthermflusci.2015.08.016en
dc.identifier.urihttp://hdl.handle.net/10754/576858en
dc.description.abstractThe stability limits, the stabilization mechanism, and the flow field structure of highly stabilized partially premixed methane flames in a concentric flow conical nozzle burner with air co-flow have been investigated and presented in this work. The stability map of partial premixed flames illustrates that the flames are stable between two extinction limits. A low extinction limit when partial premixed flames approach non-premixed flame conditions, and a high extinction limit, with the partial premixed flames approach fully premixed flame conditions. These two limits showed that the most stable flame conditions are achieved at a certain degree of partial premixed. The stability is improved by adding air co-flow. As the air co-flow velocity increases the most stable flames are those that approach fully premixed. The turbulent flow field of three flames at 0, 5, 10 m/s co-flow velocity are investigated using Stereo Particle Image Velocimetry (SPIV) in order to explore the improvement of the flame stability due to the use of air co-flow. The three flames are all at a jet equivalence ratio (Φj) of 2, fixed level of partial premixing and jet Reynolds number (Rej) of 10,000. The use of co-flow results in the formation of two vortices at the cone exit. These vortices act like stabilization anchors for the flames to the nozzle tip. With these vortices in the flow field, the reaction zone shifts toward the reduced turbulence intensity at the nozzle rim of the cone. Interesting information about the structure of the flow field with and without co-flow are identified and reported in this work.en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0894177715002277en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Experimental Thermal and Fluid Science. 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 Experimental Thermal and Fluid Science, 29 August 2015. DOI: 10.1016/j.expthermflusci.2015.08.016en
dc.subjectPartially premixeden
dc.subjectFlamesen
dc.subjectCombustionen
dc.subjectStabilityen
dc.subjectFlow fielden
dc.titleThe flow field structure of highly stabilized partially premixed flames in a concentric flow conical nozzle burner with coflowen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalExperimental Thermal and Fluid Scienceen
dc.eprint.versionPost-printen
dc.contributor.institutionMechanical Power Engineering Department, Helwan University, Cairo, Egypten
dc.contributor.institutionMechanical Power Engineering Department, Cairo University, Giza, Egypten
dc.contributor.institutionNational Institute of Laser Enhanced Sciences, Cairo University, Giza, Egypten
dc.contributor.institutionMechanical Engineering Department, The American University in Cairo, Egypten
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorElbaz, Ayman M.en
kaust.authorRoberts, William L.en
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