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    Premixed combustion under electric field in a constant volume chamber

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    Type
    Article
    Authors
    Cha, Min Suk cc
    Lee, Yonggyu
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2012-12
    Permanent link to this record
    http://hdl.handle.net/10754/562448
    
    Metadata
    Show full item record
    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.
    Citation
    Cha, M. S., & Lee, Y. (2012). Premixed Combustion Under Electric Field in a Constant Volume Chamber. IEEE Transactions on Plasma Science, 40(12), 3131–3138. doi:10.1109/tps.2012.2206120
    Sponsors
    MSC is supported by KAUST AEA Project.
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Transactions on Plasma Science
    DOI
    10.1109/TPS.2012.2206120
    ae974a485f413a2113503eed53cd6c53
    10.1109/TPS.2012.2206120
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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