Large-Eddy simulation of swirling turbulent jet flows in absence of vortex breakdown

被引：0
|
作者：
Zemtsop, Celestin P. [1 ,2 ]
Stöllinger, Michael K. [1 ,2 ]
Heinz, Stefan [1 ,2 ]
Stanescu, Dan [1 ,2 ]
机构：
[1] University of Wyoming, Laramie, Wyoming 82071, United States
[2] Department of Mathematics, 1000 East University Avenue, USA
来源：
AIAA Journal | 2009年 / 47卷 / 12期
关键词：
This paper reports the results of numerical investigations of swirling turbulent jet flows by large-eddy simulation. Reynolds-averaged Navier-Stokes simulations are used to generate mean inflow data. Fluctuations are added to the profiles of the means to produce instantaneous inflow data. The instantaneous inflowdata are correlated such that the characteristic length and time scales of inflowing turbulent eddies are consistent with the corresponding Reynoldsaveraged Navier-Stokes profiles imposed at the inlet. The resulting large-eddy simulation method is validated against experimental data of both swirling and nonswirling turbulent jets. The application of the validated largeeddy simulation method to studies of the mechanism of swirl effects shows the following. Swirl breaks apart the typical ring structures of nonswirling turbulent jets into two modes: a helical mode and streamwise braid structures. The interaction of these two modes generates unorganized turbulence that enhances the turbulent mixing. An analysis of the mixing enhancement by swirl shows a significant increase of the turbulent mixing efficiency of scalars with the swirl number (of up to 21.7% for the cases considered). Copyright © 2009 by Stefan Heinz. Published by the American Institute of Aeronautics and Astronautics; Inc;
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页码：3011 / 3021
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