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dc.contributor.authorChoi, Byungchul
dc.contributor.authorChung, Suk Ho
dc.date.accessioned2015-08-02T09:14:08Z
dc.date.available2015-08-02T09:14:08Z
dc.date.issued2010-12
dc.identifier.issn00102180
dc.identifier.doi10.1016/j.combustflame.2010.06.011
dc.identifier.urihttp://hdl.handle.net/10754/561556
dc.description.abstractThe autoignition characteristics of laminar lifted flames of methane, ethylene, ethane, and n-butane fuels have been investigated experimentally in coflow air with elevated temperature over 800. K. The lifted flames were categorized into three regimes depending on the initial temperature and fuel mole fraction: (1) non-autoignited lifted flame, (2) autoignited lifted flame with tribrachial (or triple) edge, and (3) autoignited lifted flame with mild combustion. For the non-autoignited lifted flames at relatively low temperature, the existence of lifted flame depended on the Schmidt number of fuel, such that only the fuels with Sc > 1 exhibited stationary lifted flames. The balance mechanism between the propagation speed of tribrachial flame and local flow velocity stabilized the lifted flames. At relatively high initial temperatures, either autoignited lifted flames having tribrachial edge or autoignited lifted flames with mild combustion existed regardless of the Schmidt number of fuel. The adiabatic ignition delay time played a crucial role for the stabilization of autoignited flames. Especially, heat loss during the ignition process should be accounted for, such that the characteristic convection time, defined by the autoignition height divided by jet velocity was correlated well with the square of the adiabatic ignition delay time for the critical autoignition conditions. The liftoff height was also correlated well with the square of the adiabatic ignition delay time. © 2010 The Combustion Institute.
dc.description.sponsorshipThis work was supported by Saudi Aramco and CCRC in KAUST.
dc.publisherElsevier BV
dc.subjectAutoignition
dc.subjectIgnition delay
dc.subjectLiftoff height
dc.subjectMild combustion
dc.subjectSchmidt number
dc.subjectTribrachial flame
dc.titleAutoignited laminar lifted flames of methane, ethylene, ethane, and n-butane jets in coflow air with elevated temperature
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.journalCombustion and Flame
kaust.personChoi, Byungchul
kaust.personChung, Suk Ho


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