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    Soot formation in turbulent flames of ethylene/hydrogen/ammonia

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    Name:
    Boyette_CnF_2021_AcceptedVersion.pdf
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    16.98Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2022-12-29
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    Type
    Article
    Authors
    Boyette, Wesley cc
    Steinmetz, Scott A.
    Guiberti, Thibault
    Dunn, Matthew J.
    Roberts, William L. cc
    Masri, Assaad R.
    KAUST Department
    Clean Combustion Research Center
    Physical Science and Engineering (PSE) Division
    Mechanical Engineering Program
    KAUST Grant Number
    BAS/1/1370-01-01
    Date
    2020-12-29
    Embargo End Date
    2022-12-29
    Submitted Date
    2020-07-30
    Permanent link to this record
    http://hdl.handle.net/10754/666850
    
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    Abstract
    This paper presents an experimental study of turbulent non-premixed jet flames of ethylene/nitrogen where the nitrogen is substituted with different proportions of hydrogen and/or ammonia. The focus is largely on the effects of hydrogen and ammonia on soot production in turbulent flames. A combination of pointwise, laser-induced fluorescence in the visible and UV bands (LIF-UV–visible), and laser-induced incandescence (LII) is used to measure soot precursors and soot along the flame centerline. All signals are collected at a repetition rate of 10 Hz with fast photomultiplier tubes to resolve the time decay. In a separate experiment, joint imaging of LIF-OH[sbnd]CH is also performed at a repetition rate of 10 kHz. Hydrogen substitution is found to increase the production of soot, whereas ammonia substitution inhibits soot formation. The peak mean soot volume fraction is almost a factor of 3 lower in the 25% ammonia case in comparison to the 25% nitrogen case. The mean signal decay time constant decreases with ammonia substitution, implying the formation of smaller soot nanoparticles. The mean signal decay time constant remains unaffected with hydrogen substitution. Measured peaks in LIF-CH and LIF-OH are reduced with ammonia substitution but only in regions upstream of where soot is formed. Further downstream in the sooting region, neither OH nor CH appear to be affected by the substitution of N2 with H2 or NH3.
    Citation
    Boyette, W. R., Steinmetz, S. A., Guiberti, T. F., Dunn, M. J., Roberts, W. L., & Masri, A. R. (2021). Soot formation in turbulent flames of ethylene/hydrogen/ammonia. Combustion and Flame, 226, 315–324. doi:10.1016/j.combustflame.2020.12.019
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST) (Grant no. BAS/1/1370-01-01). Authors from the University of Sydney are supported by the Australian Research Council.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2020.12.019
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S001021802030568X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2020.12.019
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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