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    An experimental study of turbulent lifted flames at elevated pressures

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    CNF-S-18-01359-repository.pdf
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    Description:
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    Type
    Article
    Authors
    Guiberti, Thibault cc
    Boyette, Wesley cc
    Masri, Assaad R.
    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
    2019-02-28
    Online Publication Date
    2019-02-28
    Print Publication Date
    2019-05
    Permanent link to this record
    http://hdl.handle.net/10754/631886
    
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    Abstract
    Studying the lift-off behavior of non-premixed jet flames is important to understanding the flame stabilization mechanisms in practical systems, including gas flares and combustors, and to improving the safety of pressurized fuel tanks in case of fuel leaks. This is typically done with the canonical configuration of an axisymmetric fuel jet issuing into a quiescent or co-flowing oxidizer and abundant data are available in the literature. However, most of these data were collected at normal or sub-atmospheric pressure and little data are available at elevated pressure and high Reynolds numbers, conditions relevant to practical configurations. The present study fills this gap by reporting lift-off height measurements of methane and ethane non-premixed jet flames for pressures up to 7 bar and Re = 57,500 in the presence of an air co-flow. Data are interpreted using Kalghatgi's model for the dimensionless lift-off height, which was previously proven successful for sub-atmospheric to normal pressures, as well as elevated pressure but only for low turbulent Reynolds numbers and propane. In this contribution, Kalghatgi's model has been shown to accurately predict the slope of the lift-off height vs. jet velocity curves at elevated pressure and large Reynolds number for methane and ethane. A new term, a function of the stoichiometric mixture fraction, the laminar burning velocity, and a turbulent Schmidt number, is also introduced to extend the predictive capabilities of Kalghatgi's model to configurations featuring a co-flow.
    Citation
    Guiberti TF, Boyette WR, Masri AR, Roberts WL (2019) An experimental study of turbulent lifted flames at elevated pressures. Combustion and Flame 203: 301–312. Available: http://dx.doi.org/10.1016/j.combustflame.2019.02.023.
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). Prof. Masri is supported by the Australian Research Council.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2019.02.023
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0010218019300872
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2019.02.023
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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