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    Statistics of scalar flux transport of major species in different premixed turbulent combustion regimes for turbulent H2-air flames

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    Type
    Conference Paper
    Authors
    Papapostolou, V.
    Chakraborty, N.
    Klein, Markus
    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
    2018
    Permanent link to this record
    http://hdl.handle.net/10754/667828
    
    Metadata
    Show full item record
    Abstract
    The statistical behaviour of turbulent scalar flux (TSF) and modelling of its transport have been analysed for major species (H2,O2 and H2O) in the context of Reynolds-Averaged Navier Stokes simulations using a detailed chemistry Direct Numerical Simulation database of freely-propagating H2−air flames spanning the corrugated flamelets (CF), thin reaction zones (TRZ) and broken reaction zones (BRZ) regimes of premixed turbulent combustion. The TSF in the CF and TRZ regimes exhibits counter-gradient transport, whilst gradient transport was found in the BRZ regime. The TSF transport equation terms' exhibited similar behaviour in the CF and TRZ regimes, but significantly differed in the BRZ regime. Similar behaviour for different terms in the TSF equation has been observed for the major reactants, while the major product shows an opposite sign. Based on a priori assessment of existing models it has been found that they perform reasonably well in the CF and TRZ regimes, but are inadequate for the BRZ regime.
    Citation
    Papapostolou, V., Chakraborty, N., Klein, M., & Im, H. G. (2018). Statistics of scalar flux transport of major species in different premixed turbulent combustion regimes for turbulent H2-air flames. Proceeding of THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer. doi:10.1615/thmt-18.200
    Publisher
    Begell House
    ISBN
    9781567004687
    9781567004670
    DOI
    10.1615/thmt-18.200
    Additional Links
    http://www.dl.begellhouse.com/references/1bb331655c289a0a,581052950cd6a1e7,5066fe333444a227.html
    ae974a485f413a2113503eed53cd6c53
    10.1615/thmt-18.200
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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