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dc.contributor.authorDesai, Swapnil
dc.contributor.authorSankaran, Ramanan
dc.contributor.authorIm, Hong G.
dc.date.accessioned2019-11-21T12:48:42Z
dc.date.available2019-11-21T12:48:42Z
dc.date.issued2019-10-24
dc.identifier.citationDesai, S., Sankaran, R., & Im, H. G. (2020). Auto-ignitive deflagration speed of methane (CH4) blended dimethyl-ether (DME)/air mixtures at stratified conditions. Combustion and Flame, 211, 377–391. doi:10.1016/j.combustflame.2019.10.001
dc.identifier.doi10.1016/j.combustflame.2019.10.001
dc.identifier.urihttp://hdl.handle.net/10754/660163
dc.description.abstractFront propagation speeds from fully resolved unsteady one dimensional simulations with dimethyl-ether (DME)/methane (CH4)/air mixtures under engine relevant conditions are presented using complex kinetics and transport. Different time-scales of monochromatic inhomogeneities in DME concentration with varying DME/CH4 blending ratios are simulated to unravel the fundamental aspects of auto-ignition and flame propagation under the influence of reactivity stratification. To understand the influence of different stratification time-scales on the flame-ignition interaction, two sets of conditions are simulated such that low temperature chemistry is present in only one of them. For a given amplitude of stratification, it is found that the instantaneous propagation speed is significantly affected by the level of CH4 concentration in the binary fuel blend. Specifically, for cases with low temperature chemistry, at relatively smaller time-scales, the overall fluctuation in the instantaneous propagation speed is found to subside as the level of CH4 concentration in the mixture is increased. However, for both sets of conditions, at comparatively larger time-scales, a rapid change in the instantaneous propagation speed is observed with an increase in the level of CH4 concentration in the mixture. The intrinsic effects of stratification time-scales on the low temperature chemistry and the high temperature chemistry are further examined to assess the flame-ignition interaction. A displacement speed analysis is also carried out to elucidate the underlying combustion modes that are responsible for such a variation in flame response.
dc.description.sponsorshipThis work was sponsored by competitive research funding from King Abdullah University of Science and Technology. This research used resources of the Oak Ridge Leadership Computing Facility at ORNL, which is supported by the Office of Science of the U.S. Department of Energy under contract DE-AC05-00OR22725. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (https://www.energy.gov/downloads/doe-public-access-plan).
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0010218019304572
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, [[Volume], [Issue], (2019-10-24)] DOI: 10.1016/j.combustflame.2019.10.001 . © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectRCCI
dc.subjectFlame speed
dc.subjectFlame dynamics
dc.subjectSpontaneous propagation
dc.subjectDeflagration
dc.subjectReactivity stratification
dc.titleAuto-ignitive deflagration speed of methane (CH4) blended dimethyl-ether (DME)/air mixtures at stratified conditions
dc.typeArticle
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentClean Combustion Research Center
dc.identifier.journalCombustion and Flame
dc.eprint.versionPost-print
dc.contributor.institutionBredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee, Knoxville, TN 37996-3394, USA
dc.contributor.institutionOak Ridge National Laboratory, Oak Ridge, TN 37831-6008, USA
kaust.personIm, Hong G.
refterms.dateFOA2019-11-26T06:09:45Z


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