Autoignited laminar lifted flames of methane/hydrogen mixtures in heated coflow air

Handle URI:
http://hdl.handle.net/10754/562140
Title:
Autoignited laminar lifted flames of methane/hydrogen mixtures in heated coflow air
Authors:
Choi, Byungchul; Chung, Suk-Ho ( 0000-0001-8782-312X )
Abstract:
Autoignited lifted flame behavior in laminar jets of methane/hydrogen mixture fuels has been investigated experimentally in heated coflow air. Three regimes of autoignited lifted flames were identified depending on initial temperature and hydrogen to methane ratio. At relatively high initial temperature, addition of a small amount of hydrogen to methane improved ignition appreciably such that the liftoff height decreased significantly. In this hydrogen-assisted autoignition regime, the liftoff height increased with jet velocity, and the characteristic flow time - defined as the ratio of liftoff height to jet velocity - correlated well with the square of the adiabatic ignition delay time. At lower temperature, the autoignited lifted flame demonstrated a unique feature in that the liftoff height decreased with increasing jet velocity. Such behavior has never been observed in lifted laminar and turbulent jet flames. A transition regime existed between these two regimes at intermediate temperature. © 2011 The Combustion Institute.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Combustion and Laser Diagnostics Laboratory
Publisher:
Elsevier
Journal:
Combustion and Flame
Issue Date:
Apr-2012
DOI:
10.1016/j.combustflame.2011.11.016
Type:
Article
ISSN:
00102180
Sponsors:
This work was supported by Saudi Aramco through KAUST CCRC. We are thankful to Drs. Tidjani Niass and Amer Amer for their helpful suggestions.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorChoi, Byungchulen
dc.contributor.authorChung, Suk-Hoen
dc.date.accessioned2015-08-03T09:45:44Zen
dc.date.available2015-08-03T09:45:44Zen
dc.date.issued2012-04en
dc.identifier.issn00102180en
dc.identifier.doi10.1016/j.combustflame.2011.11.016en
dc.identifier.urihttp://hdl.handle.net/10754/562140en
dc.description.abstractAutoignited lifted flame behavior in laminar jets of methane/hydrogen mixture fuels has been investigated experimentally in heated coflow air. Three regimes of autoignited lifted flames were identified depending on initial temperature and hydrogen to methane ratio. At relatively high initial temperature, addition of a small amount of hydrogen to methane improved ignition appreciably such that the liftoff height decreased significantly. In this hydrogen-assisted autoignition regime, the liftoff height increased with jet velocity, and the characteristic flow time - defined as the ratio of liftoff height to jet velocity - correlated well with the square of the adiabatic ignition delay time. At lower temperature, the autoignited lifted flame demonstrated a unique feature in that the liftoff height decreased with increasing jet velocity. Such behavior has never been observed in lifted laminar and turbulent jet flames. A transition regime existed between these two regimes at intermediate temperature. © 2011 The Combustion Institute.en
dc.description.sponsorshipThis work was supported by Saudi Aramco through KAUST CCRC. We are thankful to Drs. Tidjani Niass and Amer Amer for their helpful suggestions.en
dc.publisherElsevieren
dc.subjectAutoignitionen
dc.subjectIgnition delayen
dc.subjectLiftoff heighten
dc.subjectMild combustionen
dc.subjectSchmidt numberen
dc.subjectTribrachial flameen
dc.titleAutoignited laminar lifted flames of methane/hydrogen mixtures in heated coflow airen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentCombustion and Laser Diagnostics Laboratoryen
dc.identifier.journalCombustion and Flameen
dc.contributor.institutionEnvironment and Plant Team, Korean Register of Shipping, Daejeon, South Koreaen
kaust.authorChoi, Byungchulen
kaust.authorChung, Suk-Hoen
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