The flow-acoustic coupling mechanism in a -junction, which combines flows from two branches, forming the “cross-bar” of the -junction, into one pipe, forming the “stem” of the -junction, is investigated experimentally. The -junction has a step pipe expansion at its inlets. The shear layer separating from this step expansion is found to excite intense acoustic resonances over multiple ranges of flow velocity. The excited acoustic mode is confined to the branch pipes and has an acoustic pressure node at the centerline of the -junction. The length of the expansion section of the -junction is found to control the frequency of the shear layer oscillation and therefore determines the ranges of flow velocity over which acoustic resonances are excited. Introducing asymmetry in the -junction expansion length has shown little influence on the excitation of acoustic resonance. An additional -junction arrangement made of rectangular cross-sectional ducts is also investigated to facilitate a flow visualization study of unsteady flow structures in the -junction during acoustic resonance, and thereby improve understanding of the acoustic resonance mechanism and the nature of the aero-acoustic sources in the -junction.
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August 2009
Research Papers
Flow-Acoustic Coupling in -Junctions: Effect of -Junction Geometry
S. Ziada,
S. Ziada
Department of Mechanical Engineering,
e-mail: ziadas@mcmaster.ca
McMaster University
, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
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K. W. McLaren,
K. W. McLaren
Department of Mechanical Engineering,
McMaster University
, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
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Y. Li
Y. Li
Department of Applied Physics,
Eindhoven University of Technology
, Eindhoven, 5612 AZ, The Netherlands
Search for other works by this author on:
S. Ziada
Department of Mechanical Engineering,
McMaster University
, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canadae-mail: ziadas@mcmaster.ca
K. W. McLaren
Department of Mechanical Engineering,
McMaster University
, 1280 Main Street West, Hamilton, ON, L8S 4L7, Canada
Y. Li
Department of Applied Physics,
Eindhoven University of Technology
, Eindhoven, 5612 AZ, The NetherlandsJ. Pressure Vessel Technol. Aug 2009, 131(4): 041302 (14 pages)
Published Online: July 14, 2009
Article history
Received:
February 15, 2008
Revised:
October 25, 2008
Published:
July 14, 2009
Citation
Ziada, S., McLaren, K. W., and Li, Y. (July 14, 2009). "Flow-Acoustic Coupling in -Junctions: Effect of -Junction Geometry." ASME. J. Pressure Vessel Technol. August 2009; 131(4): 041302. https://doi.org/10.1115/1.3148188
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