Conical quarl swirl stabilized non-premixed flames: flame and flow field interaction

Handle URI:
http://hdl.handle.net/10754/625487
Title:
Conical quarl swirl stabilized non-premixed flames: flame and flow field interaction
Authors:
Elbaz, Ayman M.; Roberts, William L. ( 0000-0003-1999-2831 )
Abstract:
The flame-flow field interaction is studied in non-premixed methane swirl flames stabilized in quartz quarl via simultaneous measurements of the flow field using a stereo PIV and OH-PLIF at 5 KHz repetition rate. Under the same swirl intensity, two flames with different fuel jet velocity were investigated. The time-averaged flow field shows a unique flow pattern at the quarl exit, where two recirculation vortices are formed; a strong recirculation zone formed far from the quarl exit and a larger recirculation zone extending inside the quarl. However, the instantaneous images show that, the flow pattern near the quarl exit plays a vital role in the spatial location and structure of the reaction zone. In the low fuel jet velocity flame, a pair of vortical structures, located precisely at the corners of the quarl exit, cause the flame to roll up into the central region of low speed flow, where the flame sheet then tracks the axial velocity fluctuations. The vorticity field reveals a vortical structure surrounding the reaction zones, which reside on a layer of low compressive strain adjacent to that vortical structure. In the high fuel jet velocity flame, initially a laminar flame sheet resides at the inner shear layer of the main jet, along the interface between incoming fresh gas and high temperature recirculating gas. Further downstream, vortex breakdown alters the flame sheet path toward the central flame region. The lower reaction zones show good correlation to the regions of maximum vorticity and track the regions of low compressive strain associated with the inner shear layer of the jet flow. In both flames the reactions zones conform the passage of the large structure while remaining inside the low speed regions or at the inner shear layer.
KAUST Department:
Clean Combustion Research Center
Citation:
Elbaz AM, Roberts WL (2017) Conical quarl swirl stabilized non-premixed flames: flame and flow field interaction. Energy Procedia 120: 206–213. Available: http://dx.doi.org/10.1016/j.egypro.2017.07.166.
Publisher:
Elsevier BV
Journal:
Energy Procedia
Issue Date:
19-Sep-2017
DOI:
10.1016/j.egypro.2017.07.166
Type:
Article
ISSN:
1876-6102
Additional Links:
http://www.sciencedirect.com/science/article/pii/S1876610217327364
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorElbaz, Ayman M.en
dc.contributor.authorRoberts, William L.en
dc.date.accessioned2017-09-21T09:12:12Z-
dc.date.available2017-09-21T09:12:12Z-
dc.date.issued2017-09-19en
dc.identifier.citationElbaz AM, Roberts WL (2017) Conical quarl swirl stabilized non-premixed flames: flame and flow field interaction. Energy Procedia 120: 206–213. Available: http://dx.doi.org/10.1016/j.egypro.2017.07.166.en
dc.identifier.issn1876-6102en
dc.identifier.doi10.1016/j.egypro.2017.07.166en
dc.identifier.urihttp://hdl.handle.net/10754/625487-
dc.description.abstractThe flame-flow field interaction is studied in non-premixed methane swirl flames stabilized in quartz quarl via simultaneous measurements of the flow field using a stereo PIV and OH-PLIF at 5 KHz repetition rate. Under the same swirl intensity, two flames with different fuel jet velocity were investigated. The time-averaged flow field shows a unique flow pattern at the quarl exit, where two recirculation vortices are formed; a strong recirculation zone formed far from the quarl exit and a larger recirculation zone extending inside the quarl. However, the instantaneous images show that, the flow pattern near the quarl exit plays a vital role in the spatial location and structure of the reaction zone. In the low fuel jet velocity flame, a pair of vortical structures, located precisely at the corners of the quarl exit, cause the flame to roll up into the central region of low speed flow, where the flame sheet then tracks the axial velocity fluctuations. The vorticity field reveals a vortical structure surrounding the reaction zones, which reside on a layer of low compressive strain adjacent to that vortical structure. In the high fuel jet velocity flame, initially a laminar flame sheet resides at the inner shear layer of the main jet, along the interface between incoming fresh gas and high temperature recirculating gas. Further downstream, vortex breakdown alters the flame sheet path toward the central flame region. The lower reaction zones show good correlation to the regions of maximum vorticity and track the regions of low compressive strain associated with the inner shear layer of the jet flow. In both flames the reactions zones conform the passage of the large structure while remaining inside the low speed regions or at the inner shear layer.en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S1876610217327364en
dc.rightsUnder a Creative Commons licenseen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectConical swirl stabilizeden
dc.subjectnon-premixed flamesen
dc.subjectPIV/OH-PLIFen
dc.titleConical quarl swirl stabilized non-premixed flames: flame and flow field interactionen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalEnergy Procediaen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionFaculty of Engineering Mataria, Helwan University, Cairo, Egypten
kaust.authorElbaz, Ayman M.en
kaust.authorRoberts, William L.en
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