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    Tip opening of premixed bunsen flames: Extinction with negative stretch and local Karlovitz number

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    Type
    Article
    Authors
    Vu, Tranmanh
    Cha, Min Suk cc
    Lee, Byeongjun
    Chung, Suk Ho cc
    KAUST Department
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2015-04
    Permanent link to this record
    http://hdl.handle.net/10754/564133
    
    Metadata
    Show full item record
    Abstract
    The characteristics of tip openings in premixed bunsen flames have been studied experimentally by measuring OH radicals from laser-induced fluorescence and tip curvatures from chemiluminescent images. Results showed that the tip opening occurred at a constant equivalence ratio and was independent of the jet velocity in propane/air mixtures. The observation of a local extinction phenomenon of the negatively stretched flame due to the flame curvature could not be consistently explained based on flame stretch or the Karlovitz number, since they varied appreciably with the jet velocity. The concept of the local Karlovitz number (KaL) was introduced, which is defined as the ratio of the characteristic reaction time in the normal direction for a stretched flame to the characteristic flow time in the tangential direction for the stretched flame. The local Karlovitz number maintained a constant value under tip opening conditions, irrespective of the jet velocity. Tip opening occurred at a reasonably constant local Karlovitz number of about ~1.72 when the nitrogen dilution level in propane and n-butane fuels was varied.
    Citation
    Vu, T. M., Cha, M. S., Lee, B. J., & Chung, S. H. (2015). Tip opening of premixed bunsen flames: Extinction with negative stretch and local Karlovitz number. Combustion and Flame, 162(4), 1614–1621. doi:10.1016/j.combustflame.2014.11.022
    Sponsors
    Research reported in this publication was supported by Competitive Research Funding from King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2014.11.022
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2014.11.022
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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