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dc.contributor.authorMansour, Morkous S.
dc.contributor.authorAl Khesho, Issam
dc.contributor.authorChung, Suk Ho
dc.date.accessioned2015-09-06T14:10:02Z
dc.date.available2015-09-06T14:10:02Z
dc.date.issued2015-08-31
dc.identifier.citationStabilization and structure of N-heptane flame on CWJ-spray burner with kHZ SPIV and OH-PLIF 2015 Experimental Thermal and Fluid Science
dc.identifier.issn08941777
dc.identifier.doi10.1016/j.expthermflusci.2015.08.019
dc.identifier.urihttp://hdl.handle.net/10754/576856
dc.description.abstractA curved wall-jet (CWJ) burner was employed to stabilize turbulent spray flames that utilized a Coanda effect by supplying air as annular-inward jet over a curved surface, surrounding an axisymmetric solid cone fuel spray. The stabilization characteristics and structure of n-heptane/air turbulent flames were investigated with varying fuel and air flow rates and the position of pressure atomizer (L). High-speed planar laser-induced fluorescence (PLIF) of OH radicals delineated reaction zone contours and simultaneously stereoscopic particle image velocimetry (SPIV) quantified the flow field features, involving turbulent mixing within spray, ambient air entrainment and flame-turbulence interaction. High turbulent rms velocities were generated within the recirculation zone, which improved the flame stabilization. OH fluorescence signals revealed a double flame structure near the stabilization edge of lifted flame that consisted of inner partially premixed flame and outer diffusion flame front. The inner reaction zone is highly wrinkled and folded due to significant turbulent mixing between the annular-air jet and the fuel vapor generated from droplets along the contact interface of this air jet with the fuel spray. Larger droplets, having higher momentum are able to penetrate the inner reaction zone and then vaporized in the low-speed hot region bounded by these reaction zones; this supports the outer diffusion flame. Frequent local extinctions in the inner reaction zone were observed at low air flow rate. As flow rate increases, the inner zone is more resistant to local extinction despite of its high wrinkling and corrugation degree. However, the outer reaction zone exhibits stable and mildly wrinkled features irrespective of air flow rate. The liftoff height increases with the air mass flow rate but decreases with L.
dc.language.isoen
dc.publisherElsevier BV
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0894177715002307
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, 31 August 2015. DOI: 10.1016/j.expthermflusci.2015.08.019
dc.subjectTurbulent spray flame
dc.subjectCWJ burner
dc.subjectFlame structure
dc.subjectSPIV
dc.subjectOH-PLIF
dc.titleStabilization and structure of N-heptane flame on CWJ-spray burner with kHZ SPIV and OH-PLIF
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.identifier.journalExperimental Thermal and Fluid Science
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Mechanical Engineering, Helwan University, Cairo, Egypt
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personMansour, Morkous S.
kaust.personAl Khesho, Issam
refterms.dateFOA2017-08-31T00:00:00Z
dc.date.published-online2015-08-31
dc.date.published-print2016-05


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