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    Edge flame propagation via parallel electric fields in nonpremixed coflow jets

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    Type
    Article
    Authors
    Yoon, Sung Hwan
    Seo, Bohyeon
    Park, Jeong
    Chung, Suk Ho cc
    Cha, Min Suk cc
    KAUST Department
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2018-06-22
    Online Publication Date
    2018-06-22
    Print Publication Date
    2019
    Permanent link to this record
    http://hdl.handle.net/10754/628286
    
    Metadata
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    Abstract
    Recent investigations suggested that the primary influence of an electric field on a flame is flow modification caused by ionic wind, and that negative ions produced by the electron impact attachment should play a key role in the bi-directional ionic wind. In order to prove this hypothesis in electric fields parallel to the propagating flames, we designed a coflow experiment with laminar lifted flames in vertical electric fields produced by a nozzle and ground electrode installed over the flame. We found that applying DC and AC increased the flame displacement speed, and decreased the unburned velocity even to negative velocity. Velocity measurements revealed the influence of the electric body force on the flow volume, indicating the importance of the electron impact attachment when the nozzle was charged with positive voltage. The flame propagation speeds were estimated by subtracting the unburned velocity from the displacement speed, and were well correlated with those of stationary lifted flames without an applied electric field as a function of flame curvature. This supported our hypothesis that the effect of the electric field is reflected in the flow modification, and that the flame is affected by the modified flow. It also suggested that the propagation direction of premixed or nonpremixed edge flames can be manipulated by coupling the appropriate electric fields.
    Citation
    Yoon SH, Seo B, Park J, Chung SH, Cha MS (2018) Edge flame propagation via parallel electric fields in nonpremixed coflow jets. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2018.06.026.
    Sponsors
    The research reported in this publication was supported by Competitive Research Funding from King Abdullah University of Science and Technology (KAUST). BS and JP were supported by the project of Development of the Technology of Energy from KETEP in 2017-2018.
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2018.06.026
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S1540748918302098
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2018.06.026
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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