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dc.contributor.authorAl-Noman, Saeed M.
dc.contributor.authorChoi, Sang Kyu
dc.contributor.authorChung, Suk Ho
dc.date.accessioned2016-01-19T14:44:10Z
dc.date.available2016-01-19T14:44:10Z
dc.date.issued2015-12
dc.identifier.citationAl-Noman SM, Choi SK, Chung SH (2015) Autoignition characteristics of laminar lifted jet flames of pre-vaporized iso-octane in heated coflow air. Fuel 162: 171–178. Available: http://dx.doi.org/10.1016/j.fuel.2015.09.006.
dc.identifier.issn0016-2361
dc.identifier.doi10.1016/j.fuel.2015.09.006
dc.identifier.urihttp://hdl.handle.net/10754/594241
dc.description.abstractThe stabilization characteristics of laminar non-premixed jet flames of pre-vaporized iso-octane, one of the primary reference fuels for octane rating, have been studied experimentally in heated coflow air. Non-autoignited and autoignited lifted flames were analyzed. With the coflow air at relatively low initial temperatures below 940 K, an external ignition source was required to stabilize the flame. These lifted flames had tribrachial edge structures and their liftoff heights correlated well with the jet velocity scaled by stoichiometric laminar burning velocity, indicating the importance of the edge propagation speed on flame stabilization. At high initial temperatures over 940 K, the autoignited flames were stabilized without requiring an external ignition source. These autoignited lifted flames exhibited either tribrachial edge structures or mild combustion behaviors depending on the level of fuel dilution. Two distinct transition behaviors were observed in the autoignition regime from a nozzle-attached flame to a lifted tribrachial-edge flame and then to lifted mild combustion as the jet velocity increased at a certain fuel dilution level. The liftoff data of the autoignited flames with tribrachial edges were analyzed based on calculated ignition delay times. Analysis of the experimental data suggested that ignition delay time may be much less sensitive to initial temperature under atmospheric pressure conditions as compared with predictions. © 2015 Elsevier Ltd. All rights reserved.
dc.publisherElsevier BV
dc.subjectAutoignition
dc.subjectIso-octane
dc.subjectLifted flame
dc.subjectMild combustion
dc.subjectTribrachial edge
dc.titleAutoignition characteristics of laminar lifted jet flames of pre-vaporized iso-octane in heated coflow air
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentCombustion and Laser Diagnostics Laboratory
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalFuel
dc.contributor.institutionEnvironmental and Energy Systems Research Division, KOR Institute of Machinery and Materials, Daejeon, South Korea
kaust.personAlnoman, Saeed
kaust.personChung, Suk Ho


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