Early structure of LPG partially premixed conically stabilized flames

Handle URI:
http://hdl.handle.net/10754/562564
Title:
Early structure of LPG partially premixed conically stabilized flames
Authors:
Elbaz, Ayman M.
Abstract:
This paper presents experimental investigation of LPG partially premixed turbulent flames stabilized within a conical nozzle burner under constant degree of partial premixing. The stability limits and mean flame structure are presented based on the mean gas temperature and the concentration of CO, O 2, NO, and HC at the flame early region of reaction. The investigation covered the influence of the nozzle cone angle, the jet exit velocity and the jet equivalence ratio. The stability results show that the flames with cone are more stable than those without cone. For conical stabilized flames, the stability results exhibit three different sensitivity regions between the jet velocity and equivalence ratio. The inflame measurements prove that the flame stability could be attributed to the triple flame structure at the flame leading edge. The data show that the triple flame structure is influenced by cone angle, the jet velocity and the equivalence ratio. The flame is believed to be controlled by the recirculation flow inside the cone. Increasing the cone angle induced higher air entrainment to the reaction zone as depicted by a higher O 2 concentration within the flame leading edge. Increasing the jet velocity to a certain limit enhances the intensity of combustion at the flame leading edge, while excessive increase in jet velocity reduces this intensity. At a fixed jet velocity the higher the equivalence ratio, the higher the amount of fuel diffused and engulfed to the reaction zone, the more delay of the combustion completion and the higher the emission concentrations of the flame. © 2012 Elsevier Inc.
KAUST Department:
Clean Combustion Research Center
Publisher:
Elsevier
Journal:
Experimental Thermal and Fluid Science
Issue Date:
Jan-2013
DOI:
10.1016/j.expthermflusci.2012.08.021
Type:
Article
ISSN:
08941777
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorElbaz, Ayman M.en
dc.date.accessioned2015-08-03T10:42:56Zen
dc.date.available2015-08-03T10:42:56Zen
dc.date.issued2013-01en
dc.identifier.issn08941777en
dc.identifier.doi10.1016/j.expthermflusci.2012.08.021en
dc.identifier.urihttp://hdl.handle.net/10754/562564en
dc.description.abstractThis paper presents experimental investigation of LPG partially premixed turbulent flames stabilized within a conical nozzle burner under constant degree of partial premixing. The stability limits and mean flame structure are presented based on the mean gas temperature and the concentration of CO, O 2, NO, and HC at the flame early region of reaction. The investigation covered the influence of the nozzle cone angle, the jet exit velocity and the jet equivalence ratio. The stability results show that the flames with cone are more stable than those without cone. For conical stabilized flames, the stability results exhibit three different sensitivity regions between the jet velocity and equivalence ratio. The inflame measurements prove that the flame stability could be attributed to the triple flame structure at the flame leading edge. The data show that the triple flame structure is influenced by cone angle, the jet velocity and the equivalence ratio. The flame is believed to be controlled by the recirculation flow inside the cone. Increasing the cone angle induced higher air entrainment to the reaction zone as depicted by a higher O 2 concentration within the flame leading edge. Increasing the jet velocity to a certain limit enhances the intensity of combustion at the flame leading edge, while excessive increase in jet velocity reduces this intensity. At a fixed jet velocity the higher the equivalence ratio, the higher the amount of fuel diffused and engulfed to the reaction zone, the more delay of the combustion completion and the higher the emission concentrations of the flame. © 2012 Elsevier Inc.en
dc.publisherElsevieren
dc.subjectConical flamesen
dc.subjectPartial premixing flameen
dc.titleEarly structure of LPG partially premixed conically stabilized flamesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalExperimental Thermal and Fluid Scienceen
dc.contributor.institutionMechanical Power Engineering Department, Faculty of Engineering, Helwan University, P.O. Box 11718, Egypten
kaust.authorElbaz, Ayman M.en
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