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dc.contributor.authorRyu, Seol
dc.contributor.authorKim, Youkyoung
dc.contributor.authorKim, Minkuk
dc.contributor.authorWon, Sanghee
dc.contributor.authorChung, Suk Ho
dc.date.accessioned2015-08-02T09:11:13Z
dc.date.available2015-08-02T09:11:13Z
dc.date.issued2010-01
dc.identifier.citationRyu, 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
dc.identifier.issn00102180
dc.identifier.doi10.1016/j.combustflame.2009.10.001
dc.identifier.urihttp://hdl.handle.net/10754/561434
dc.description.abstractThe 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.
dc.description.sponsorshipThis work was supported by HKCRC through IAMD/SNU and CCRC/KAUST.
dc.publisherElsevier BV
dc.subjectElectric fields
dc.subjectLifted flame
dc.subjectLow frequency
dc.subjectOscillation
dc.titleObservation of multi-scale oscillation of laminar lifted flames with low-frequency AC electric fields
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentCombustion and Laser Diagnostics Laboratory
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalCombustion and Flame
dc.contributor.institutionSchool of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 151-742, South Korea
kaust.personChung, Suk Ho


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