Premixed combustion under electric field in a constant volume chamber

Handle URI:
http://hdl.handle.net/10754/562448
Title:
Premixed combustion under electric field in a constant volume chamber
Authors:
Cha, Min Suk ( 0000-0003-4059-3421 ) ; Lee, Yonggyu
Abstract:
The effects of electric fields on outwardly propagating premixed flames in a constant volume chamber were experimentally investigated. An electric plug, subjected to high electrical voltages, was used to generate electric fields inside the chamber. To minimize directional ionic wind effects, alternating current with frequency of 1 kHz was employed. Lean and rich fuel/air mixtures for both methane and propane were tested to investigate various preferential diffusion conditions. As a result, electrically induced instability showing cracked structure on the flame surface could be observed. This cracked structure enhanced flame propagation speed for the initial period of combustion and led to reduction in flame initiation and overall combustion duration times. However, by analyzing pressure data, it was found that overall burning rates are not much affected from the electric field for the pressurized combustion period. The reduction of overall combustion time is less sensitive to equivalence ratio for methane/air mixtures, whereas the results demonstrate pronounced effects on a lean mixture for propane. The improvement of combustion characteristics in lean mixtures will be beneficial to the design of lean burn engines. Two hypothetical mechanisms to explain the electrically induced instability were proposed: 1) ionic wind initiated hydrodynamic instability and 2) thermodiffusive instability through the modification of transport property such as mass diffusivity. © 2012 IEEE.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Journal:
IEEE Transactions on Plasma Science
Issue Date:
Dec-2012
DOI:
10.1109/TPS.2012.2206120
Type:
Article
ISSN:
00933813
Sponsors:
MSC is supported by KAUST AEA Project.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorCha, Min Suken
dc.contributor.authorLee, Yonggyuen
dc.date.accessioned2015-08-03T10:38:33Zen
dc.date.available2015-08-03T10:38:33Zen
dc.date.issued2012-12en
dc.identifier.issn00933813en
dc.identifier.doi10.1109/TPS.2012.2206120en
dc.identifier.urihttp://hdl.handle.net/10754/562448en
dc.description.abstractThe effects of electric fields on outwardly propagating premixed flames in a constant volume chamber were experimentally investigated. An electric plug, subjected to high electrical voltages, was used to generate electric fields inside the chamber. To minimize directional ionic wind effects, alternating current with frequency of 1 kHz was employed. Lean and rich fuel/air mixtures for both methane and propane were tested to investigate various preferential diffusion conditions. As a result, electrically induced instability showing cracked structure on the flame surface could be observed. This cracked structure enhanced flame propagation speed for the initial period of combustion and led to reduction in flame initiation and overall combustion duration times. However, by analyzing pressure data, it was found that overall burning rates are not much affected from the electric field for the pressurized combustion period. The reduction of overall combustion time is less sensitive to equivalence ratio for methane/air mixtures, whereas the results demonstrate pronounced effects on a lean mixture for propane. The improvement of combustion characteristics in lean mixtures will be beneficial to the design of lean burn engines. Two hypothetical mechanisms to explain the electrically induced instability were proposed: 1) ionic wind initiated hydrodynamic instability and 2) thermodiffusive instability through the modification of transport property such as mass diffusivity. © 2012 IEEE.en
dc.description.sponsorshipMSC is supported by KAUST AEA Project.en
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.subjectElectric fielden
dc.subjectelectrically induced instabilityen
dc.subjectflame cellularityen
dc.subjectpremixed flame propagationen
dc.subjectpropagation speed enhancementen
dc.titlePremixed combustion under electric field in a constant volume chamberen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalIEEE Transactions on Plasma Scienceen
dc.contributor.institutionKorea Institute of Machinery and Materials, Daejeon 305-333, South Koreaen
kaust.authorCha, Min Suken
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