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    Dynamics of flow–soot interaction in wrinkled non-premixed ethylene–air flames

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    Type
    Article
    Authors
    Arias, Paul G.
    Lecoustre, Vivien R.
    Roy, Somesh
    Luo, Zhaoyu
    Haworth, Daniel C.
    Lu, Tianfeng
    Trouvé, Arnaud
    Im, Hong G. cc
    KAUST Department
    Clean Combustion Research Center
    Computational Reacting Flow Laboratory (CRFL)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2015-08-17
    Online Publication Date
    2015-08-17
    Print Publication Date
    2015-09-03
    Permanent link to this record
    http://hdl.handle.net/10754/594079
    
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    Abstract
    A two-dimensional simulation of a non-premixed ethylene–air flame was conducted by employing a detailed gas-phase reaction mechanism considering polycyclic aromatic hydrocarbons, an aerosol-dynamics-based soot model using a method of moments with interpolative closure, and a grey gas and soot radiation model using the discrete transfer method. Interaction of the sooting flame with a prescribed decaying random velocity field was investigated, with a primary interest in the effects of velocity fluctuations on the flame structure and the associated soot formation process for a fuel-strip configuration and a composition with mature soot growth. The temporally evolving simulation revealed a multi-layered soot formation process within the flame, at a level of detail not properly described by previous studies based on simplified soot models utilizing acetylene or naphthalene precursors for initial soot inception. The overall effect of the flame topology on the soot formation was found to be consistent with previous experimental studies, while a unique behaviour of localised strong oxidation was also noted. The imposed velocity fluctuations led to an increase of the scalar dissipation rate in the sooting zone, causing a net suppression in the soot production rate. Considering the complex structure of the soot formation layer, the effects of the imposed fluctuations vary depending on the individual soot reactions. For the conditions under study, the soot oxidation reaction was identified as the most sensitive to the fluctuations and was mainly responsible for the local suppression of the net soot production. © 2015 Taylor & Francis
    Citation
    Arias PG, Lecoustre VR, Roy S, Luo Z, Haworth DC, et al. (2015) Dynamics of flow–soot interaction in wrinkled non-premixed ethylene–air flames. Combustion Theory and Modelling 19: 568–586. Available: http://dx.doi.org/10.1080/13647830.2015.1067331.
    Sponsors
    National Science Foundation[OCI-0904649, OCI-0904771, OCI-0904660, OCI-0904480]
    Publisher
    Informa UK Limited
    Journal
    Combustion Theory and Modelling
    DOI
    10.1080/13647830.2015.1067331
    ae974a485f413a2113503eed53cd6c53
    10.1080/13647830.2015.1067331
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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