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dc.contributor.authorAl-Noman, Saeed M.*
dc.contributor.authorChoi, Byung Chul*
dc.contributor.authorChung, Suk-Ho*
dc.date.accessioned2018-05-17T11:18:22Z
dc.date.available2018-05-17T11:18:22Z
dc.date.issued2018-05-16en
dc.identifier.citationAl-Noman SM, Choi BC, Chung SH (2018) Autoignited lifted flames of dimethyl ether in heated coflow air. Combustion and Flame. Available: http://dx.doi.org/10.1016/j.combustflame.2018.04.020.en
dc.identifier.issn0010-2180en
dc.identifier.doi10.1016/j.combustflame.2018.04.020en
dc.identifier.urihttp://hdl.handle.net/10754/627915
dc.description.abstractAutoignited lifted flames of dimethyl ether (DME) in laminar nonpremixed jets with high-temperature coflow air have been studied experimentally. When the initial temperature was elevated to over 860 K, an autoignition occurred without requiring an external ignition source. A planar laser-induced fluorescence (PLIF) technique for formaldehyde (CH2O) visualized qualitatively the zone of low temperature kinetics in a premixed flame. Two flame configurations were investigated; (1) autoignited lifted flames with tribrachial edge having three distinct branches of a lean and a rich premixed flame wings with a trailing diffusion flame and (2) autoignited lifted flames with mild combustion when the fuel was highly diluted. For the autoignited tribrachial edge flames at critical autoignition conditions, exhibiting repetitive extinction and re-ignition phenomena near a blowout condition, the characteristic flow time (liftoff height scaled with jet velocity) was correlated with the square of the ignition delay time of the stoichiometric mixture. The liftoff heights were also correlated as a function of jet velocity times the square of ignition delay time. Formaldehydes were observed between the fuel nozzle and the lifted flame edge, emphasizing a low-temperature kinetics for autoignited lifted flames, while for a non-autoignited lifted flame, formaldehydes were observed near a thin luminous flame zone.For the autoignited lifted flames with mild combustion, especially at a high temperature, a unique non-monotonic liftoff height behavior was observed; decreasing and then increasing liftoff height with jet velocity. This behavior was similar to the binary mixture fuels of CH4/H2 and CO/H2 observed previously. A transient homogeneous autoignition analysis suggested that such decreasing behavior with jet velocity can be attributed to partial oxidation characteristics of DME in producing appreciable amounts of CH4/CO/H2 ahead of the edge flame region.en
dc.description.sponsorshipThis work was supported by King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0010218018301780en
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, (2018) DOI: 10.1016/j.combustflame.2018.04.020. © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectAutoignitionen
dc.subjectTribrachial flameen
dc.subjectDMEen
dc.titleAutoignited lifted flames of dimethyl ether in heated coflow airen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division*
dc.contributor.departmentMechanical Engineering Program*
dc.contributor.departmentClean Combustion Research Center*
dc.identifier.journalCombustion and Flameen
dc.eprint.versionPost-printen
dc.contributor.institutionResearch and Development Department, Saudi Electricity Company, Riyadh, Saudi Arabia*
dc.contributor.institutionResearch and Development Center, Korean Register of Shipping, Busan, Republic of Korea*
kaust.authorChung, Suk-Ho*


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NOTICE: 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, (2018) DOI: 10.1016/j.combustflame.2018.04.020. © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Except where otherwise noted, this item's license is described as NOTICE: 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, (2018) DOI: 10.1016/j.combustflame.2018.04.020. © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/