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Images of the quenching of a flame by a vortex--To quantify regimes of turbulent combustion

dc.contributor.authorRoberts, William L.en_US
dc.contributor.authorDriscoll, James F.en_US
dc.contributor.authorDrake, Michael C.en_US
dc.contributor.authorGoss, Larry P.en_US
dc.date.accessioned2006-04-10T15:40:59Z
dc.date.available2006-04-10T15:40:59Z
dc.date.issued1993-07en_US
dc.identifier.citationRoberts, William L., Driscoll, James F., Drake, Michael C., Goss, Larry P. (1993/07)."Images of the quenching of a flame by a vortex--To quantify regimes of turbulent combustion." Combustion and Flame 94(1-2): 58-62. <http://hdl.handle.net/2027.42/30696>en_US
dc.identifier.urihttp://www.sciencedirect.com/science/article/B6V2B-497S9CJ-XS/2/3edb13c81fb313673e656f375386f040en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/30696
dc.description.abstractA laminar toroidal vortex is interacted with a laminar premixed flame in order to isolate and to visualize some of the fundamental physics of turbulent combustion. Localized quenching of the flame was observed using planar laser-induced fluorescence imaging of superequilibrium OH molecules in the counterflow flamefront region near the vortex leading edge. A quenching limit curve was measured as a function of vortex size and strength. In the second part of the study, the measurements are combined with concepts proposed by Poinsot, Veynante, and Candel in order to infer the thin flame limit, namely, the onset of distributed reactions, on a classical premixed turbulent combustion regime diagram. The measured thin flame limit indicates when laminar flamelet theories become invalid, since quenching allows hot products and reactants to coexist. Results are compared with the Klimov-Williams criterion. Vortex core diameters were as small as the flame thickness in some cases. The main conclusion is that small vortices are less effective at quenching a flame than was previously believed; therefore the inferred regime within which thin flame theories are valid extends to a turbulence intensity that is more than an order of magnitude larger than that which was previously predicted. Results also indicate that micromixing models, which assume that the smallest eddies exert the largest strain on a flame, are not realistic. Measured trends are in agreement with direct numerical simulations of Poinsot et al., but absolute values differ. The measured vortex Karlovitz number that is required to quench a flame is not constant but decreases by a factor of four as vortex size increases from one to five flame thicknesses. Thin-film pyrometry was used to quantify the radiative heat losses; quenching occurs when the products cool to approximately 1300 K, which is in agreement with stretched laminar flame calculations that include detailed chemistry. The quenching Karlovitz number for propane-air flames differs from that of methane-air flames, indicating the importance of detailed chemistry and transport properties. Flame curvature was observed to cause enhancement (or reduction) of the local reaction rate, depending on the Lewis number, in a manner that is consistent with stretched flame theory.en_US
dc.format.extent987063 bytes
dc.format.extent3118 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoen_US
dc.publisherElsevieren_US
dc.titleImages of the quenching of a flame by a vortex--To quantify regimes of turbulent combustionen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelPhysicsen_US
dc.subject.hlbsecondlevelMathematicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109, USAen_US
dc.contributor.affiliationumDepartment of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109, USAen_US
dc.contributor.affiliationotherGeneral Motors Research Laboratories, Warren, MI 48090, USAen_US
dc.contributor.affiliationotherSystems Research Laboratories, Dayton, OH 45440, USAen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/30696/1/0000341.pdfen_US
dc.identifier.doihttp://dx.doi.org/10.1016/0010-2180(93)90019-Yen_US
dc.identifier.sourceCombustion and Flameen_US
dc.owningcollnameInterdisciplinary and Peer-Reviewed


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