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    Effect of Lewis number on ball-like lean limit flames

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    Zhou_etal_2018_CNF_Lewis_limit_flame.pdf
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    Type
    Article
    Authors
    Zhou, Zhen
    Shoshin, Yuriy
    Hernandez Perez, Francisco
    van Oijen, Jeroen A.
    de Goey, Laurentius P.H. cc
    KAUST Department
    Clean Combustion Research Center
    Date
    2017-10-13
    Online Publication Date
    2017-10-13
    Print Publication Date
    2018-02
    Permanent link to this record
    http://hdl.handle.net/10754/625897
    
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    Abstract
    The lean limit flames for three different fuel compositions premixed with air, representing three different mixture Lewis numbers, stabilized inside a tube in a downward flow are examined by experiments and numerical simulations. The CH* chemiluminescence distribution in CH4–air and CH4–H2–air flames and the OH* chemiluminescence distribution in H2–air flames are recorded in the experiments. Cell-like flames are observed for the CH4–air mixture for all tested equivalence ratios. However, for CH4–H2–air and H2–air flames, ball-like lean limit flames are observed. Flame temperature fields are measured using Rayleigh scattering. The experimentally observed lean limit flames are predicted qualitatively by numerical simulation with the mixture-averaged transport model and skeletal mechanism of CH4. The results of the simulations show that the entire lean limit flames of CH4–H2–air and H2–air mixtures are located inside a recirculation zone. However, for the lean limit CH4–air flame, only the leading edge is located inside the recirculation zone. A flame structure with negative flame displacement speed is observed for the leading edges of the predicted lean limit flames with all three different fuel compositions. As compared with 1D planar flames, the fuel transport caused by convection is less significant in the present 2D lean limit flames for the three different fuel compositions. For the trailing edges of the three predicted lean limit flames, a diffusion dominated flame structure is observed.
    Citation
    Zhou Z, Shoshin Y, Hernández-Pérez FE, van Oijen JA, de Goey LPH (2018) Effect of Lewis number on ball-like lean limit flames. Combustion and Flame 188: 77–89. Available: http://dx.doi.org/10.1016/j.combustflame.2017.09.023.
    Sponsors
    The financial support of the Dutch Technology Foundation (STW), Project 13549, is gratefully acknowledged. The authors thank Prof. Clinton Groth for providing access to the CFFC (Computational Framework for Fluids and Combustion) code.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2017.09.023
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0010218017303607
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2017.09.023
    Scopus Count
    Collections
    Articles; Clean Combustion Research Center

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