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

Handle URI:
http://hdl.handle.net/10754/622239
Title:
Propagating nonpremixed edge-flames in a counterflow, annular slot burner under DC electric fields
Authors:
Tran, Vu Manh ( 0000-0002-6713-4201 ) ; Cha, Min Suk ( 0000-0003-4059-3421 )
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
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division
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.
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
11-Sep-2016
DOI:
10.1016/j.combustflame.2016.08.012
Type:
Article
ISSN:
0010-2180
Sponsors:
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0010218016302231
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorTran, Vu Manhen
dc.contributor.authorCha, Min Suken
dc.date.accessioned2017-01-02T08:42:39Z-
dc.date.available2017-01-02T08:42:39Z-
dc.date.issued2016-09-11en
dc.identifier.citationTran 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.en
dc.identifier.issn0010-2180en
dc.identifier.doi10.1016/j.combustflame.2016.08.012en
dc.identifier.urihttp://hdl.handle.net/10754/622239-
dc.description.abstractCharacteristics 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 Instituteen
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0010218016302231en
dc.subjectDisplacement speeden
dc.subjectEdge-flameen
dc.subjectElectric fielden
dc.subjectPropagation speeden
dc.titlePropagating nonpremixed edge-flames in a counterflow, annular slot burner under DC electric fieldsen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalCombustion and Flameen
kaust.authorTran, Vu Manhen
kaust.authorCha, Min Suken
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