A posteriori assessment of algebraic scalar dissipation models for RANS simulation of premixed turbulent combustion

Umair Ahmed, Robert Prosser

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    Abstract

    This paper examines the eects of scalar dissipation rate modelling on
    mean reaction rate predictions in turbulent premixed
    ames. The sensitivity of the
    mean reaction rate is explored by using dierent closures for scalar dissipation and the sensitivity of the scalar dissipation models themselves is also examined withrespect to their dening constants. The influence of dierent scalar dissipation
    models on the same location and mean velocities is reported and compared with
    experimental results. The predicted reaction rate is found to be sensitive to the
    choice of closure used for scalar dissipation and also to the respective constants
    used in the scalar dissipation models. It is also found that the scalar dissipation models involving chemical and turbulent time scales yield a more physically plausible reaction rate when compared with the scalar dissipation models relying onlyon the turbulent time scale.
    Original languageEnglish
    JournalFlow, Turbulence and Combustion
    Early online date14 Jun 2017
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Algebraic scalar dissipation models
    • Flame turbulence interaction
    • RANS simulation of premixed turbulent combustion
    • Premixed turbulent combustion
    • Turbulence scalar interaction

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