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    Propagating nonpremixed edge-flames in a counterflow, annular slot burner under DC electric fields

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    Type
    Article
    Authors
    Tran, Vu Manh cc
    Cha, Min Suk cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-09-11
    Online Publication Date
    2016-09-11
    Print Publication Date
    2016-11
    Permanent link to this record
    http://hdl.handle.net/10754/622239
    
    Metadata
    Show full item record
    Abstract
    Characteristics of propagating nonpremixed edge-flames were investigated in a counterflow, annular slot burner. A high-voltage direct current (DC) was applied to the lower part of the burner and the upper part was grounded, creating electric field lines perpendicular to the direction of edge-flame propagation. Upon application of an electric field, an ionic wind is caused by the migration of positive and negative ions to lower and higher electrical potential sides of a flame, respectively. Under an applied DC, we found a significant decrease in edge-flame displacement speeds unlike several previous studies, which showed an increase in displacement speed. Within a moderate range of field intensity, we found effects on flame propagation speeds to be negligible after correcting the flame displacement speed with respect to the unburned flow velocity ahead of the flame edge. This indicates that the displacement speed of an edge-flame strongly depends on ionic wind and that an electric field has little or no impact on propagation speed. The ionic wind also influenced the location of the stoichiometric contour in front of the propagating edge in a given configuration such that a propagating edge was relocated to the higher potential side due to an imbalance between ionic winds originating from positive and negative ions. In addition, we observed a steadily wrinkled flame following transient propagation of the edge-flame, a topic for future research. © 2016 The Combustion Institute
    Citation
    Tran M-V, Cha MS (2016) Propagating nonpremixed edge-flames in a counterflow, annular slot burner under DC electric fields . Combustion and Flame 173: 114–122. Available: http://dx.doi.org/10.1016/j.combustflame.2016.08.012.
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2016.08.012
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0010218016302231
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2016.08.012
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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