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    Ultra-lean hydrogen-enriched oscillating flames behind a heat conducting bluff-body: Anomalous and normal blow-off

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    Type
    Article
    Authors
    Jiménez, Carmen cc
    Michaels, Dan
    Ghoniem, Ahmed F.
    KAUST Grant Number
    KUS-110-010-01
    Date
    2019-01-25
    Permanent link to this record
    http://hdl.handle.net/10754/678657
    
    Metadata
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    Abstract
    This 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.
    Citation
    Jiménez, 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
    Sponsors
    This 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.
    Publisher
    ELSEVIER SCIENCE INC
    Journal
    PROCEEDINGS OF THE COMBUSTION INSTITUTE
    DOI
    10.1016/j.proci.2018.06.117
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1540748918303006
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2018.06.117
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