Bidirectional ionic wind in nonpremixed counterflow flames with DC electric fields

Handle URI:
http://hdl.handle.net/10754/622176
Title:
Bidirectional ionic wind in nonpremixed counterflow flames with DC electric fields
Authors:
Park, Daegeun ( 0000-0002-6658-2096 ) ; Chung, Suk-Ho ( 0000-0001-8782-312X ) ; Cha, Min Suk ( 0000-0003-4059-3421 )
Abstract:
Under an electric field, ions in the reaction zone of a flame generate a bulk flow motion called ionic wind. Because the majority of ions are positive, ionic wind is commonly considered to be unidirectional toward the cathode. A more thorough understanding of the effects of electric fields on flames could be obtained by clarifying the role of minor negative ions in the ionic wind. Here, we report on the effects of direct current on nonpremixed counterflow flames by visualizing the ionic wind. We found that the original flow field separates near the flame when it locates at a flow stagnation plane, resulting in a double-stagnant flow configuration. This evidences a bidirectional ionic wind blowing from the flame to both the cathode and the anode due to the positive and the negative ions, respectively. Meanwhile, an electric body force pulls the flame toward the cathode. Thus, the electric field affects the strain rate and the axial location of the stoichiometry, which are important for characterizing nonpremixed counterflow flames. In addition, measurement of the electric current density roughly showed a nearly saturated current when these flames restabilized under relatively high voltage. Detailed explanations of flame behavior, electric currents, and flow characteristics of various fuels are discussed in this study.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division
Citation:
Park DG, Chung SH, Cha MS (2016) Bidirectional ionic wind in nonpremixed counterflow flames with DC electric fields. Combustion and Flame 168: 138–146. Available: http://dx.doi.org/10.1016/j.combustflame.2016.03.025.
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
5-May-2016
DOI:
10.1016/j.combustflame.2016.03.025
Type:
Article
ISSN:
0010-2180
Sponsors:
Research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST) under Competitive Research Funding.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorPark, Daegeunen
dc.contributor.authorChung, Suk-Hoen
dc.contributor.authorCha, Min Suken
dc.date.accessioned2017-01-02T08:42:36Z-
dc.date.available2017-01-02T08:42:36Z-
dc.date.issued2016-05-05en
dc.identifier.citationPark DG, Chung SH, Cha MS (2016) Bidirectional ionic wind in nonpremixed counterflow flames with DC electric fields. Combustion and Flame 168: 138–146. Available: http://dx.doi.org/10.1016/j.combustflame.2016.03.025.en
dc.identifier.issn0010-2180en
dc.identifier.doi10.1016/j.combustflame.2016.03.025en
dc.identifier.urihttp://hdl.handle.net/10754/622176-
dc.description.abstractUnder an electric field, ions in the reaction zone of a flame generate a bulk flow motion called ionic wind. Because the majority of ions are positive, ionic wind is commonly considered to be unidirectional toward the cathode. A more thorough understanding of the effects of electric fields on flames could be obtained by clarifying the role of minor negative ions in the ionic wind. Here, we report on the effects of direct current on nonpremixed counterflow flames by visualizing the ionic wind. We found that the original flow field separates near the flame when it locates at a flow stagnation plane, resulting in a double-stagnant flow configuration. This evidences a bidirectional ionic wind blowing from the flame to both the cathode and the anode due to the positive and the negative ions, respectively. Meanwhile, an electric body force pulls the flame toward the cathode. Thus, the electric field affects the strain rate and the axial location of the stoichiometry, which are important for characterizing nonpremixed counterflow flames. In addition, measurement of the electric current density roughly showed a nearly saturated current when these flames restabilized under relatively high voltage. Detailed explanations of flame behavior, electric currents, and flow characteristics of various fuels are discussed in this study.en
dc.description.sponsorshipResearch reported in this publication was supported by King Abdullah University of Science and Technology (KAUST) under Competitive Research Funding.en
dc.publisherElsevier BVen
dc.subjectCounterflowen
dc.subjectDouble stagnant flowen
dc.subjectElectric fielden
dc.subjectIonic winden
dc.subjectNonpremixed flameen
dc.titleBidirectional ionic wind in nonpremixed counterflow flames with 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.authorPark, Daegeunen
kaust.authorChung, Suk-Hoen
kaust.authorCha, Min Suken
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