URANS CFD for Mixing Enhancement with Steady and Pulsed Control Jets_Final_Version.pdf (1.91 MB)
Unsteady predictions of mixing enhancement with steady and pulsed control jets
journal contribution
posted on 2015-06-30, 14:01 authored by Muhammad A. Kamran, Jim McGuirkUnsteady 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.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Published in
AIAA JOURNALVolume
53Issue
5Pages
1262 - 1276 (15)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.Publisher
© American Institute of Aeronautics and AstronauticsVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2015Notes
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.J053374ISSN
0001-1452Publisher version
Language
- en