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Inventi Impact - Combustion

Articles

  • Inventi:eco/60/14
    LOCAL STRAIN RATE AND CURVATURE DEPENDENCES OF SCALAR DISSIPATION RATE TRANSPORT IN TURBULENT PREMIXED FLAMES: A DIRECT NUMERICAL SIMULATION ANALYSIS
    Y Gao, N Chakraborty, N Swaminathan

    Thestatistical behaviours of the instantaneous scalar dissipation rateNc of reaction progress variable c in turbulent premixed flames have been analysed based on three-dimensional direct numerical simulation data of freely propagating statistically planar flame and V-flame configurations with different turbulent Reynolds number Ret. The statistical behaviours of Nc and different terms of its transport equation for planar and V-flames are found to be qualitatively similar. The mean contribution of the density-variation term T1 is positive, whereas the molecular dissipation term (-D2) acts as a leading order sink. The mean contribution of the strain rate term T2 is predominantly negative for the cases considered here. The mean reaction rate contribution T3 is positive (negative) towards the unburned (burned) gas side of the flame, whereas the mean contribution of the diffusivity gradient term (D) assumes negative (positive) values towards the unburned (burned) gas side. The local statistical behaviours of Nc, T1, T2, T3, (-D2), and f(D) have been analysed in terms of their marginal probability density functions (pdfs) and their joint pdfs with local tangential strain rate aT and curvature Km. Detailed physical explanations have been provided for the observed behaviour.

    How to Cite this Article
    CC Compliant Citation: Y. Gao, N. Chakraborty, and N. Swaminathan, “Local Strain Rate and Curvature Dependences of Scalar Dissipation Rate Transport in Turbulent Premixed Flames: A Direct Numerical Simulation Analysis,” Journal of Combustion, vol. 2014, Article ID 280671, 29 pages, 2014. doi:10.1155/2014/280671. Copyright © 2014 Y. Gao et al. This is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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