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Large-eddy simulations of turbulent swirling flows injected into a dump chamber

Published online by Cambridge University Press:  09 March 2005

XIYUN LU ,
SHANWU WANG ,
HONG-GYE SUNG ,
SHIH-YANG HSIEH  and
VIGOR YANG
XIYUN LU
Affiliation:
Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA Present Address: University of Science and Technology of China, Hefei, Anhui 230027, China.
SHANWU WANG
Affiliation:
Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA
HONG-GYE SUNG
Affiliation:
Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA Present Address: Agency for Defense Development, Taejeon 305-600, South Korea.
SHIH-YANG HSIEH
Affiliation:
Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA Present Address: General Electric Aircraft Engines, Cincinnati, OH 45215, USA.
VIGOR YANG
Affiliation:
Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA
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Abstract

Turbulent swirling flows injected into a coaxial dump chamber at different swirl numbers were studied using large-eddy simulations. The Favre-filtered conservation equations of mass, momentum, and energy in three dimensions were solved numerically by means of a finite-volume approach. Results have been validated against experimental data in terms of mean flow velocity and turbulence properties. The work provides insight into several salient features of swirling flows, including vortex breakdown, shear-layer instability, and vortico-acoustic interactions. The dominant acoustic mode in the chamber was found to be sensitive to unsteady vorticity evolution, which in turn strongly depends on the swirl number. Low-frequency acoustic oscillations may arise from large-scale coherent motions in the central toroidal recirculation zone at high swirl numbers. In contrast, the shear-layer instability downstream of the backward-facing step results in high-frequency acoustic waves at low swirl numbers.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 527 , 25 March 2005 , pp. 171 - 195
Copyright
© 2005 Cambridge University Press

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