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    A new double-slit curved wall-jet (CWJ) burner for stabilizing turbulent premixed and non-premixed flames

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    Type
    Conference Paper
    Authors
    Mansour, Morkous S. cc
    Chung, Suk Ho cc
    KAUST Department
    Clean Combustion Research Center
    Physical Science and Engineering (PSE) Division
    Mechanical Engineering Program
    Date
    2015-01-01
    Permanent link to this record
    http://hdl.handle.net/10754/566968
    
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    Abstract
    A novel double-slit curved wall-jet (CWJ) burner was proposed and employed, which utilizes the Coanda effect by supplying fuel and air as annular-inward jets over a curved surface. We investigated the stabilization characteristics and structure of methane/air, and propane/air turbulent premixed and non-premixed flames with varying global equivalence ratio, φ, and Reynolds number, Re. Simultaneous time-resolved measurements of particle image velocimetry and planar laser-induced fluorescence of OH radicals were conducted. The burner showed potential for stable operation for methane flames with relatively large fuel loading and overall rich conditions. These have a non-sooting nature. However, propane flames exhibit stable mode for a wider range of equivalence ratio and Re. Mixing characteristics in the cold flow of non-premixed cases were first examined using acetone fluorescence technique, indicating substantial transport between the fuel and air by exhibiting appreciable premixing conditions. PIV measurements revealed that velocity gradients in the shear layers at the boundaries of the annular jets generate the turbulence, enhanced with the collisions in the interaction jet, IJ, region. Turbulent mean and rms velocities were influenced significantly by Re and high rms turbulent velocities are generated within the recirculation zone improving the flame stabilization in this burner. Premixed and non-premixed flames with high equivalence ratio were found to be more resistant to local extinction and exhibited a more corrugated and folded nature, particularly at high Re. For flames with low equivalence ratio, the processes of local quenching at IJ region and of re-ignition within merged jet region maintained these flames further downstream particularly for non-premixed methane flame, revealing a strong intermittency.
    Publisher
    TSFP-9
    Journal
    Proceedings of Ninth International Symposium on Turbulence and Shear Flow Phenomena (TSFP-9)
    Conference/Event name
    9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
    ISBN
    9780000000002
    Additional Links
    ftp://tepeu.sisal.unam.mx/TSFP9/full_paper/1C-1.pdf
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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