Unsteady Reynolds-averaged Navier–Stokes predictions are reported for a single round jet at high Reynolds number and high subsonic Mach number (, ) excited by steady and pulsed control jets. Comparison has been made with experimental validation data to assess the ability of -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 in predictions, compared to 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.
Unsteady Predictions of Mixing Enhancement with Steady and Pulsed Control Jets
AIAA Journal ; 53 , 5 ; 1262-1276
2014-10-01
15 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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