A detailed three-dimensional numerical simulation was conducted to investigate the flow and H 2 -air mixing characteristics in a scramjet engine with two intake sidewalls and a cavity flameholder. Turbulence closure was achieved using a model that combines the low-Reynolds-number k - ε two-equation model and Sarkar and Wilcox’s compressible turbulent-correction model. The governing equations were solved numerically by means of a finite volume, preconditioned flux-differencing scheme. Cases of with and without intake sidewalls were considered. Intake sidewalls were found to strongly affect the inlet flow structure, which became more complex in the nonuniform flowfield on the cross section perpendicular to the engine axis. The complex and nonuniform flow affected the H 2 -air mixing pattern inside the combustion chamber, unlike the pattern of the case of without sidewalls. To verify the accuracy of the simulation, the computed wall pressure was compared with the experimental data. Mixing efficiency and fuel-propagation rate were evaluated for the two cases of with and without sidewalls. The mixing efficiency of the sidewall case is slightly larger than the other case through the combustor, but the fuel spreads toward the combustor center and forms a relatively narrower fuel region with higher equivalence ratio.


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    Title :

    Numerical Analysis of a Scramjet Engine with Intake Sidewalls and Cavity Flameholder


    Contributors:

    Published in:

    AIAA Journal ; 51 , 7 ; 1566-1575


    Publication date :

    2013-05-22


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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