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Research Papers: Fluid-Structure Interaction

Experimental Investigation of a Tandem Cylinder System With a Yawed Upstream Cylinder

[+] Author and Article Information
Stephen J. Wilkins

e-mail: x514a@unb.ca

Joseph W. Hall

e-mail: jwhall@unb.ca
Department of Mechanical Engineering,
University of New Brunswick,
Fredericton, NB E3B 5A3, Canada

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 13, 2012; final manuscript received September 17, 2013; published online November 27, 2013. Assoc. Editor: Jong Chull Jo.

J. Pressure Vessel Technol 136(1), 011302 (Nov 27, 2013) (8 pages) Paper No: PVT-12-1127; doi: 10.1115/1.4025612 History: Received August 13, 2012; Revised September 17, 2013

The unsteady flow field produced by a tandem cylinder system with the upstream cylinder yawed to the mean flow direction is investigated for upstream cylinder yaw angles from α=60deg to α=90deg. Multipoint fluctuating surface pressure and hot-wire measurements were conducted at various spanwise positions on both the upstream and downstream cylinders. The results indicate that yawing the front cylinder to the mean flow direction causes the pressure and velocity spectra on the upstream and downstream cylinders to become more broadband than for a regular tandem cylinder system, and reduces the magnitude of the peak associated with the vortex-shedding. However, spanwise correlation and coherence measurements indicate that the vortex-shedding is still present and was being obscured by the enhanced three-dimensionality that the upstream yawed cylinder caused. When the cylinder was yawed to α=60deg, the pressure fluctuations became extremely broadband and exhibited shorter spanwise correlation.

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References

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Figures

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Fig. 1

Schematic of a tandem cylinder system with a yawed upstream cylinder for (a) α = 90deg, (b) α = 80deg, (c) α = 70deg, and (d) α = 60deg

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Fig. 2

Pressure spectra for α = 90deg

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Fig. 3

Normalized power spectra for various locations for α = 80deg at RE = 56,000

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Fig. 4

Upstream cylinder spanwise correlation referenced to bottom upstream microphone for α = 80deg

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Fig. 5

Upstream cylinder spanwise correlation referenced to top upstream microphone for α = 80deg

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Fig. 6

Downstream cylinder spanwise correlation referenced to bottom downstream microphone for α = 80deg

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Fig. 7

Upstream cylinder spanswise coherence referenced to bottom upstream microphone for α = 80deg

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Fig. 8

Downstream cylinder spanwise coherence referenced to bottom downstream microphone for α = 80deg

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Fig. 9

Downstream cylinder spanwise coherence referenced to bottom upstream microphone for α = 80deg

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Fig. 10

Normalized power spectra for various locations for α = 70deg at RE = 56,000

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Fig. 11

Normalized power spectra for various locations for α = 60deg at RE = 56,000

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Fig. 12

Upstream cylinder spanwise coherence referenced to bottom upstream microphone for α = 60deg

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Fig. 13

Downstream cylinder spanwise coherence referenced to bottom downstream microphone for α = 60deg

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