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    Observation of multi-scale oscillation of laminar lifted flames with low-frequency AC electric fields

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    Type
    Article
    Authors
    Ryu, Seol
    Kim, Youkyoung
    Kim, Minkuk
    Won, Sanghee
    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
    2010-01
    Permanent link to this record
    http://hdl.handle.net/10754/561434
    
    Metadata
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    Abstract
    The oscillation behavior of laminar lifted flames under the influence of low-frequency AC has been investigated experimentally in coflow jets. Various oscillation modes were existed depending on jet velocity and the voltage and frequency of AC, especially when the AC frequency was typically smaller than 30 Hz. Three different oscillation modes were observed: (1) large-scale oscillation with the oscillation frequency of about 0.1 Hz, which was independent of the applied AC frequency, (2) small-scale oscillation synchronized to the applied AC frequency, and (3) doubly-periodic oscillation with small-scale oscillation embedded in large-scale oscillation. As the AC frequency decreased from 30 Hz, the oscillation modes were in the order of the large-scale oscillation, doubly-periodic oscillation, and small-scale oscillation. The onset of the oscillation for the AC frequency smaller than 30 Hz was in close agreement with the delay time scale for the ionic wind effect to occur, that is, the collision response time. Frequency-doubling behavior for the small-scale oscillation has also been observed. Possible mechanisms for the large-scale oscillation and the frequency-doubling behavior have been discussed, although the detailed understanding of the underlying mechanisms will be a future study. © 2009 The Combustion Institute.
    Citation
    Ryu, S. K., Kim, Y. K., Kim, M. K., Won, S. H., & Chung, S. H. (2010). Observation of multi-scale oscillation of laminar lifted flames with low-frequency AC electric fields. Combustion and Flame, 157(1), 25–32. doi:10.1016/j.combustflame.2009.10.001
    Sponsors
    This work was supported by HKCRC through IAMD/SNU and CCRC/KAUST.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2009.10.001
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2009.10.001
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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