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    Experimental characterization of methane inverse diffusion flame

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    Type
    Article
    Authors
    Elbaz, Ayman M.
    Roberts, William L. cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    high-pressure combustion (HPC) Research Group
    Date
    2014-07-28
    Online Publication Date
    2014-07-28
    Print Publication Date
    2014-09-02
    Permanent link to this record
    http://hdl.handle.net/10754/563610
    
    Metadata
    Show full item record
    Abstract
    This article presents 10-kHz images of OH-PLIF simultaneously with 2-D PIV measurements in an inverse methane diffusion flame. Under a constant fuel flow rate, the central air jet Re was varied, leading to air to fuel velocity ratio, Vr, to vary from 8.3 to 66.5. Starting from Vr = 20.7, the flame is commonly characterized by three distinct zones. The length of the lower fuel entrainment region is inversely proportional to Vr. The flames investigated resemble a string shear layer confining this zone, and converging into the second distinct region, the flame neck zone. The third region is the rest of the flame, which spreads in a jet-like manner. The inverse diffusion flames exhibit varying degrees of partial premixing, depending upon on the velocity ratio Vr, and this region of partial premixing evolves into a well-mixed reaction zone along the flame centerline. The OH distribution correlated with the changes in the mean characteristics of the flow through reduction in the local Reynolds number due to heat release. The existence of a flame suppresses or laminarizes the turbulence at early axial locations and promotes fluctuations at the flame tip for flames with Vr < 49.8. In addition, the flame jet width can be correlated to the OH distribution. In upstream regions of the flames, the breaks in OH are counterbalanced by flame closures and are governed by edge flame propagation. These local extinctions were found to occur at locations where large flow structures were impinging on the flame and are associated with a locally higher strain rate or correlated to the local high strain rates at the flame hole edges without this flow impinging. Another contributor to re-ignition was found to be growing flame kernels. As the flames approach global blow-off, these kernels become the main mechanism for re-ignition further downstream of the flames. At low Vr, laminarization within the early regions of the flame provides an effective shield, preventing the jet flow from penetrating through the flame. © Copyright © 2014 Taylor & Francis Group, LLC.
    Citation
    Elbaz, A. M., & Roberts, W. L. (2014). Experimental Characterization of Methane Inverse Diffusion Flame. Combustion Science and Technology, 186(9), 1249–1272. doi:10.1080/00102202.2014.920835
    Publisher
    Informa UK Limited
    Journal
    Combustion Science and Technology
    DOI
    10.1080/00102202.2014.920835
    ae974a485f413a2113503eed53cd6c53
    10.1080/00102202.2014.920835
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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