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    Effect of Electric Field on Outwardly Propagating Spherical Flame

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    Ossama Mannaa Thesis_final_draft.pdf
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    Type
    Thesis
    Authors
    Mannaa, Ossama cc
    Advisors
    Chung, Suk Ho cc
    Committee members
    Farooq, Aamir cc
    Roberts, William L. cc
    Program
    Mechanical Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2012-06
    Embargo End Date
    2014-12-31
    Permanent link to this record
    http://hdl.handle.net/10754/273076
    
    Metadata
    Show full item record
    Access Restrictions
    At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2014-12-31.
    Abstract
    The thesis comprises effects of electric fields on a fundamental study of spheri­cal premixed flame propagation.Outwardly-propagating spherical laminar premixed flames have been investigated in a constant volume combustion vessel by applying au uni-directional electric potential.Direct photography and schlieren techniques have been adopted and captured images were analyzed through image processing. Unstretched laminar burning velocities under the influence of electric fields and their associated Markstein length scales have been determined from outwardly prop­agating spherical flame at a constant pressure. Methane and propane fuels have been tested to assess the effect of electric fields on the differential diffusion of the two fuels.The effects of varying equivalence ratios and applied voltages have been in­vestigated, while the frequency of AC was fixed at 1 KHz. Directional propagating characteristics were analyzed to identify the electric filed effect. The flame morphology varied appreciably under the influence of electric fields which in turn affected the burning rate of mixtures.The flame front was found to propagate much faster toward to the electrode at which the electric fields were supplied while the flame speeds in the other direction were minimally influenced. When the voltage was above 7 KV the combustion is markedly enhanced in the downward direction since intense turbulence is generated and as a result the mixing process or rather the heat and mass transfer within the flame front will be enhanced.The com­bustion pressure for the cases with electric fields increased rapidly during the initial stage of combustion and was relatively higher since the flame front was lengthened in the downward direction.
    Citation
    Mannaa, O. (2012). Effect of Electric Field on Outwardly Propagating Spherical Flame. KAUST Research Repository. https://doi.org/10.25781/KAUST-M3628
    DOI
    10.25781/KAUST-M3628
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-M3628
    Scopus Count
    Collections
    MS Theses; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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