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    Formation and stabilization of multiple ball-like flames at Earth gravity

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    Zhou_etal_2018_CNF_multiple_flameballs_authors.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
    Physical Science and Engineering (PSE) Division
    Date
    2018-03-20
    Online Publication Date
    2018-03-20
    Print Publication Date
    2018-06
    Permanent link to this record
    http://hdl.handle.net/10754/627375
    
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    Abstract
    Near-limit low-Lewis-number premixed flame behavior is studied experimentally and numerically for flames of H–CH–air mixtures that are located in a 55 mm diameter tube and below a perforated plate in a downward mixture flow. A combustion regime diagram is experimentally identified in terms of equivalence ratio and ratio of H to CH (variation of fuel Lewis number). Planar flames, cell-like flames, distorted cap-like flames, and arrays of ball-like flames are progressively observed in the experiments as the equivalence ratio is decreased. The experimentally observed ball-like lean limit flames experience chaotic motion, which is accompanied by sporadic events of flame splitting and extinction, while the total number of simultaneously burning flamelets remains approximately the same. In separate experiments, the multiple ball-like lean limit flames are stabilized by creating a slightly non-uniform mixture flow field. The CH* chemiluminescence distributions of the lean limit flames are recorded, showing that the ball-like lean limit flame front becomes more uniform in intensity and its shape approaches a spherical one with the increase of H content in the fuel. Numerical simulations are performed for single representative flames of the array of stabilized flamelets observed in the experiments. The simulated ball-like lean limit flame is further contrasted with the single ball-like flame that forms in a narrow tube (13.5 mm inner diameter) with an iso-thermal wall. The numerical results show that the ball-like lean limit flames present in the array of ball-like flames are more affected by the buoyancy-induced recirculation zone, compared with that in the narrow tube, revealing why the shape of the ball-like flame in the array deviates more from a spherical one. All in all, the wall confinement is not crucial for the formation of ball-like flames at terrestrial gravity.
    Citation
    Zhou Z, Shoshin Y, Hernández-Pérez FE, van Oijen JA, de Goey LPH (2018) Formation and stabilization of multiple ball-like flames at Earth gravity. Combustion and Flame 192: 35–43. Available: http://dx.doi.org/10.1016/j.combustflame.2018.01.034.
    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.2018.01.034
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0010218018300385
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2018.01.034
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Clean Combustion Research Center

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