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

Handle URI:
http://hdl.handle.net/10754/561434
Title:
Observation of multi-scale oscillation of laminar lifted flames with low-frequency AC electric fields
Authors:
Ryu, Seol; Kim, Youkyoung; Kim, Minkuk; Won, Sanghee; Chung, Suk-Ho ( 0000-0001-8782-312X )
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.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Combustion and Laser Diagnostics Laboratory
Publisher:
Elsevier
Journal:
Combustion and Flame
Issue Date:
Jan-2010
DOI:
10.1016/j.combustflame.2009.10.001
Type:
Article
ISSN:
00102180
Sponsors:
This work was supported by HKCRC through IAMD/SNU and CCRC/KAUST.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorRyu, Seolen
dc.contributor.authorKim, Youkyoungen
dc.contributor.authorKim, Minkuken
dc.contributor.authorWon, Sangheeen
dc.contributor.authorChung, Suk-Hoen
dc.date.accessioned2015-08-02T09:11:13Zen
dc.date.available2015-08-02T09:11:13Zen
dc.date.issued2010-01en
dc.identifier.issn00102180en
dc.identifier.doi10.1016/j.combustflame.2009.10.001en
dc.identifier.urihttp://hdl.handle.net/10754/561434en
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.en
dc.description.sponsorshipThis work was supported by HKCRC through IAMD/SNU and CCRC/KAUST.en
dc.publisherElsevieren
dc.subjectElectric fieldsen
dc.subjectLifted flameen
dc.subjectLow frequencyen
dc.subjectOscillationen
dc.titleObservation of multi-scale oscillation of laminar lifted flames with low-frequency AC electric fieldsen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentCombustion and Laser Diagnostics Laboratoryen
dc.identifier.journalCombustion and Flameen
dc.contributor.institutionSchool of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 151-742, South Koreaen
kaust.authorChung, Suk-Hoen
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