Unsteady Reynolds-averaged Navier–Stokes predictions are reported for a single round jet at high Reynolds number and high subsonic Mach number ( R e = 10 6 , M = 0.9 ) excited by steady and pulsed control jets. Comparison has been made with experimental validation data to assess the ability of k - ε -based unsteady Reynolds-averaged Navier–Stokes modeling for predicting control-jet-driven flow control of near-field jet mixing and potential core-length reduction. The well-known overprediction of the clean (unexcited) core length with this level of turbulence closure remains, but taking this into account, the relative effect of control jets on core-length reduction was predicted remarkably well. For example, steady control jets and pulsed control jets in symmetric/antisymmetric modes indicated a core-length reduction (relative to the unexcited case) of 43 / 45 / 60 % in predictions, compared to 48 / 40 / 51 % in measurements. Comparison of radial profiles showed that unsteady Reynolds-averaged Navier–Stokes modeling was also able to predict the three-dimensional near-field behavior induced by control jets throughout the jet cross section. The vortex structures produced in the pulsed-control-jet predictions were compared. Symmetric and antisymmetric modes produced different vortex structures; these caused different levels of enhanced mixing in the two azimuthal modes and explained the better performance of antisymmetric pulsing.


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    Title :

    Unsteady Predictions of Mixing Enhancement with Steady and Pulsed Control Jets


    Contributors:

    Published in:

    AIAA Journal ; 53 , 5 ; 1262-1276


    Publication date :

    2015-05-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






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