This work presents a numerical study of a diffusion flame in a reacting, two-dimensional, turbulent, viscous, multicomponent, compressible mixing layer subject to a large favorable streamwise pressure gradient. The boundary-layer equations are solved coupled with both the k ω and shear-stress transport turbulence models. A compressible extension of the flamelet progress variable method has been proposed and tested for use with large-eddy simulations or Reynolds-averaged Navier–Stokes analyses of the burning of methane in pure air and vitiated air; the latter being particularly relevant in turbine burner scenarios. Effects of the level of detail of the reaction mechanism on the subgrid- and resolved-scale computations are studied. A comparison is made with results obtained using a simplified one-step reaction. The numerical results employing the flamelet model with the more detailed reaction mechanism show faster chemistry, significantly reduced peak temperatures, and stronger sensitivity to pressure. Vitiated air flames are found to be dominated by unstable solutions, resulting in a weak flame with substantially lower peak temperature and impeded development, struggling to persist without quenching.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Turbulent Accelerating Combusting Flows with Methane-Vitiated Air Flamelet Model


    Contributors:

    Published in:

    AIAA Journal ; 63 , 4 ; 1474-1489


    Publication date :

    2025-04-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Turbulent Accelerating Combusting Flows with a Methane-Vitiated Air Flamelet Model

    Walsh, Sylvain L. / Zhan, Lei / Mehring, Carsten et al. | AIAA | 2024


    Flame Stability in Combusting Turbulent Jets

    Nelson,H.F. / Kushida,R. / Univ.of Missouri-Rolla,Dep.of Mech.and Aerosp.Engng.,US et al. | Automotive engineering | 1976



    Statistical modeling of turbulent dilute combusting sprays

    Litchford, Ron J. / Jeng, San-Mou | NTRS | 1992


    Statistical modeling of turbulent dilute combusting sprays

    LITCHFORD, RON J. / JENG, SAN-MOU | AIAA | 1992