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Comparison of the near-field flow structures of a triangular jet with and without the initial confinement of a chamber

Citation

Xu, M and Lee, SK and Mi, J and Li, P and Zhang, J, Comparison of the near-field flow structures of a triangular jet with and without the initial confinement of a chamber, Fluid-Structure-Sound Interactions and Control: Proceedings of the 2nd Symposium on Fluid-Structure-Sound Interactions and Control, 20-23 May 2013, Hong Kong and Macau, pp. 149-154. ISSN 2195-4356 (2014) [Refereed Conference Paper]

DOI: doi:10.1007/978-3-642-40371-2_21

Abstract

This paper reports a large eddy simulation (LES) of the precession-like oscillation produced by partially confining a triangular-jet flow with a short cylindrical chamber. The present LES, which has been verified by previous experimental data, shows that there is a strong inward swirl around the jet near the inlet end of the chamber. At the center of the swirl, there is a cluster of three sink foci, where each focus is aligned midway between the corners of the triangular inlet orifice. In the time-averaged flow field, the vortices rising from the foci are helically twisted about the core of the jet. As the flow passes through the chamber, the foci merge to form a closed-loop bifurcation line which separates the inward swirl and the core flow. The core of the emerging jet is visible as a source node at the approximate centerline of the chamber. If the chamber is removed, a cluster of six counter-rotating foci is produced in the free jet. When this happens, the net swirl circulation is zero and there is no jet oscillation.

Item Details

Item Type:Refereed Conference Paper
Keywords:acoustics aeroelasticity, biological systems, flow-induced vibration control, flow-sound-structure interaction, fluid-structure interaction, fluid-structure interaction, turbulence, turbulent shear flows
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ship and Platform Hydrodynamics
Objective Division:Transport
Objective Group:Environmentally Sustainable Transport
Objective Field:Management of Noise and Vibration from Transport Activities
Author:Lee, SK (Dr Soon-Kong Lee)
ID Code:119438
Year Published:2014
Deposited By:Australian Maritime College
Deposited On:2017-08-01
Last Modified:2017-08-01
Downloads:0

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