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    A flame index for the lagrangian probability density function method

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    Type
    Conference Paper
    Authors
    Lu, Zhen
    Ren, Zhuyin
    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
    2017-01-01
    Permanent link to this record
    http://hdl.handle.net/10754/668869
    
    Metadata
    Show full item record
    Abstract
    To separate the nonpremixed and premixed modes in partially premixed flame simulations with the transported PDF method, a flame index is proposed based on the subgrid mixing rate between Lagrangian particles. The mixing rate on local equivalence ratio and progress variable is compared to measure the combustion mode. With a renormalized progress variable, the proposed flame index is 0 for equilibrium solution of the nonpremixed flame, and 1 for the premixed flame with homogeneous cold flow. The index is validated on a series of constructed turbulent combustion subgrid particles and the partially stirred reactors with different mixing models. Tests demonstrate that the flame index for PDF method works well for nonpremixed flames with variant scalar dissipation rate. Furthermore, the index shows a consistent trend at different parameters. Results also confirms that the localness of the EMST model make it predict the physical process well.
    Sponsors
    This research work was sponsored by King Abdul-lah University of Science and Technology (KAUST). The simulations utilized the computing resources at KAUST Supercomputing Laboratory.
    Publisher
    Combustion Institute
    Conference/Event name
    11th Asia-Pacific Conference on Combustion, ASPACC 2017
    Additional Links
    https://www.scopus.com/record/display.uri?eid=2-s2.0-85046546587&origin=inward&txGid=3e3efa1550eb613e5ae14ebcf5b90ef7
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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