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dc.contributor.authorJiménez, Carmen
dc.contributor.authorMichaels, Dan
dc.contributor.authorGhoniem, Ahmed F.
dc.date.accessioned2022-06-06T08:10:34Z
dc.date.available2022-06-06T08:10:34Z
dc.date.issued2019-01-25
dc.identifier.citationJiménez, C., Michaels, D., & Ghoniem, A. F. (2019). Ultra-lean hydrogen-enriched oscillating flames behind a heat conducting bluff-body: Anomalous and normal blow–off. Proceedings of the Combustion Institute, 37(2), 1843–1850. doi:10.1016/j.proci.2018.06.117
dc.identifier.issn1873-2704
dc.identifier.issn1540-7489
dc.identifier.doi10.1016/j.proci.2018.06.117
dc.identifier.urihttp://hdl.handle.net/10754/678657
dc.description.abstractThis paper presents a numerical study of ultra-lean hydrogen-methane flames stabilized behind a rectangular, highly conducting metallic bluff body acting as a flame holder. Using high fidelity numerical simulations, we show that lean inverted steady flames exist below normal flammability limits. They have distinct stabilization mechanism from pure methane flames. These flames are blown-off for sufficiently small velocities, a phenomenon called anomalous blow-off. At even leaner conditions oscillating ultra-lean hydrogen-methane flames can be established. These oscillating flames exist within a rather small range of equivalence ratios and inflow velocities, and move to mean locations closer to the flame holder as the reactant flow is increased. We show that the oscillations are associated with the shedding of flame balls from the downstream end of a "residual flame" that remains attached. Unlike their steady counterparts, the oscillating flames exhibit blow-off at both low velocities (anomalous blow-off) and at sufficiently high inflow velocities (normal blow-off). We show that normal blow-off is linked to heat losses to the flame holder.
dc.description.sponsorshipThis work was supported partly by a MIT-Technion fellowship to D. Michaels, by a KAUST grant number KUS-110-010-01, and by the MINECO/FEDER grant number ENE2015-65852-C2-2-R.
dc.publisherELSEVIER SCIENCE INC
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S1540748918303006
dc.subjectLaminar flames
dc.subjectBluff-body stabilization
dc.subjectUltra-lean
dc.subjectConjugate heat exchange
dc.subjectHydrogen
dc.titleUltra-lean hydrogen-enriched oscillating flames behind a heat conducting bluff-body: Anomalous and normal blow-off
dc.typeArticle
dc.identifier.journalPROCEEDINGS OF THE COMBUSTION INSTITUTE
dc.identifier.wosutWOS:000456621500068
dc.contributor.institutionCIEMAT, Ave Complutense 40, E-28040 Madrid, Spain
dc.contributor.institutionTechnion Israel Inst Technol, IL-32000 Haifa, Israel
dc.contributor.institutionMIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA
dc.identifier.volume37
dc.identifier.issue2
dc.identifier.pages1843-1850
kaust.grant.numberKUS-110-010-01
dc.identifier.eid2-s2.0-85049439868


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