Blow-out limits of nonpremixed turbulent jet flames in a cross flow at atmospheric and sub-atmospheric pressures

Handle URI:
http://hdl.handle.net/10754/567061
Title:
Blow-out limits of nonpremixed turbulent jet flames in a cross flow at atmospheric and sub-atmospheric pressures
Authors:
Wang, Qiang; Hu, Longhua; Yoon, Sung Hwan; Lu, Shouxiang; Delichatsios, Michael; Chung, Suk-Ho ( 0000-0001-8782-312X )
Abstract:
The blow-out limits of nonpremixed turbulent jet flames in cross flows were studied, especially concerning the effect of ambient pressure, by conducting experiments at atmospheric and sub-atmospheric pressures. The combined effects of air flow and pressure were investigated by a series of experiments conducted in an especially built wind tunnel in Lhasa, a city on the Tibetan plateau where the altitude is 3650 m and the atmospheric pressure condition is naturally low (64 kPa). These results were compared with results obtained from a wind tunnel at standard atmospheric pressure (100 kPa) in Hefei city (altitude 50 m). The size of the fuel nozzles used in the experiments ranged from 3 to 8 mm in diameter and propane was used as the fuel. It was found that the blow-out limit of the air speed of the cross flow first increased (“cross flow dominant” regime) and then decreased (“fuel jet dominant” regime) as the fuel jet velocity increased in both pressures; however, the blow-out limit of the air speed of the cross flow was much lower at sub-atmospheric pressure than that at standard atmospheric pressure whereas the domain of the blow-out limit curve (in a plot of the air speed of the cross flow versus the fuel jet velocity) shrank as the pressure decreased. A theoretical model was developed to characterize the blow-out limit of nonpremixed jet flames in a cross flow based on a Damköhler number, defined as the ratio between the mixing time and the characteristic reaction time. A satisfactory correlation was obtained at relative strong cross flow conditions (“cross flow dominant” regime) that included the effects of the air speed of the cross flow, fuel jet velocity, nozzle diameter and pressure.
KAUST Department:
Clean Combustion Research Center
Citation:
Blow-out limits of nonpremixed turbulent jet flames in a cross flow at atmospheric and sub-atmospheric pressures 2015 Combustion and Flame
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
22-Jul-2015
DOI:
10.1016/j.combustflame.2015.06.012
Type:
Article
ISSN:
00102180
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0010218015001935
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorWang, Qiangen
dc.contributor.authorHu, Longhuaen
dc.contributor.authorYoon, Sung Hwanen
dc.contributor.authorLu, Shouxiangen
dc.contributor.authorDelichatsios, Michaelen
dc.contributor.authorChung, Suk-Hoen
dc.date.accessioned2015-08-17T07:42:41Zen
dc.date.available2015-08-17T07:42:41Zen
dc.date.issued2015-07-22en
dc.identifier.citationBlow-out limits of nonpremixed turbulent jet flames in a cross flow at atmospheric and sub-atmospheric pressures 2015 Combustion and Flameen
dc.identifier.issn00102180en
dc.identifier.doi10.1016/j.combustflame.2015.06.012en
dc.identifier.urihttp://hdl.handle.net/10754/567061en
dc.description.abstractThe blow-out limits of nonpremixed turbulent jet flames in cross flows were studied, especially concerning the effect of ambient pressure, by conducting experiments at atmospheric and sub-atmospheric pressures. The combined effects of air flow and pressure were investigated by a series of experiments conducted in an especially built wind tunnel in Lhasa, a city on the Tibetan plateau where the altitude is 3650 m and the atmospheric pressure condition is naturally low (64 kPa). These results were compared with results obtained from a wind tunnel at standard atmospheric pressure (100 kPa) in Hefei city (altitude 50 m). The size of the fuel nozzles used in the experiments ranged from 3 to 8 mm in diameter and propane was used as the fuel. It was found that the blow-out limit of the air speed of the cross flow first increased (“cross flow dominant” regime) and then decreased (“fuel jet dominant” regime) as the fuel jet velocity increased in both pressures; however, the blow-out limit of the air speed of the cross flow was much lower at sub-atmospheric pressure than that at standard atmospheric pressure whereas the domain of the blow-out limit curve (in a plot of the air speed of the cross flow versus the fuel jet velocity) shrank as the pressure decreased. A theoretical model was developed to characterize the blow-out limit of nonpremixed jet flames in a cross flow based on a Damköhler number, defined as the ratio between the mixing time and the characteristic reaction time. A satisfactory correlation was obtained at relative strong cross flow conditions (“cross flow dominant” regime) that included the effects of the air speed of the cross flow, fuel jet velocity, nozzle diameter and pressure.en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0010218015001935en
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, 22 July 2015. DOI: 10.1016/j.combustflame.2015.06.012en
dc.subjectNonpremixed turbulent jet flameen
dc.subjectCross flowen
dc.subjectBlow-out limiten
dc.subjectPressure effecten
dc.titleBlow-out limits of nonpremixed turbulent jet flames in a cross flow at atmospheric and sub-atmospheric pressuresen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalCombustion and Flameen
dc.eprint.versionPost-printen
dc.contributor.institutionState Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, Chinaen
dc.contributor.institutionDivision of Mechanical and Space Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido, Japanen
dc.contributor.institutionFireSERT, School of Built Environment, University of Ulster, Newtownabbey BT38 8GQ, Irelanden
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorChung, Suk-Hoen
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