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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/18103

Title: Unsteady predictions of mixing enhancement with steady and pulsed control jets
Authors: Kamran, Muhammad A.
McGuirk, James J.
Issue Date: 2015
Publisher: © American Institute of Aeronautics and Astronautics
Citation: KAMRAN, M.A. and MCGUIRK, J.J., 2015. Unsteady predictions of mixing enhancement with steady and pulsed control jets. AIAA Journal, 53 (5), pp. 1262 - 1276.
Abstract: Unsteady Reynolds-averaged Navier–Stokes predictions are reported for a single round jet at high Reynolds number and high subsonic Mach number (Re=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.
Description: This is the accepted version of an article that was subsequently published in the AIAA Journal [© AIAA]. The definitive version is available at: http://dx.doi.org/10.2514/1.J053374
Version: Accepted for publication
DOI: 10.2514/1.J053374
URI: https://dspace.lboro.ac.uk/2134/18103
Publisher Link: http://dx.doi.org/10.2514/1.J053374
ISSN: 0001-1452
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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URANS CFD for Mixing Enhancement with Steady and Pulsed Control Jets_Final_Version.pdfAccepted version1.95 MBAdobe PDFView/Open

 

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