The phenomenon of sound generation has been investigated in some detail for the case of bare cylinders; however, the effect of adding fins to the cylinder on the flow–sound interaction mechanism is not yet fully understood. Thus, the aeroacoustic response of a cylinder with straight circular fins in cross-flow is investigated experimentally in this work. During the experiments, the acoustic modes of the duct housing the cylinder are self-excited due to the vortex shedding that emerges from the cylinder's surface. In order to determine the effect of different fin parameters on the onset and intensity of acoustic resonance, 14 different finned cylinders with fin thickness ranging from 0.35 to 1.5 mm and fin density ranging from 4 to 13.7 fin/in. are investigated. It is observed that the finned cylinders experience an earlier acoustic resonance and higher levels of acoustic pressure compared to their equivalent bare cylinders. Moreover, it is observed that, for constant fin spacing, the acoustic pressure amplitude increases and the acoustic resonance occurs at earlier velocities as the fin thickness increases. On the other hand, for constant fin thickness, as the fin spacing increases the amplitude of the acoustic pressure decreases while the onset of the resonance is delayed. Finally, the effect of the cylinder's aspect ratio on the acoustic resonance excitation is presented. It is shown that as the finned cylinders' aspect ratio increases from 4.85 to 11.3, the normalized acoustic pressure during resonance increases drastically. However, for bare cylinders the normalized acoustic pressure during resonance is not highly dependent on the cylinders' aspect ratio. These results indicate that adding fins to the cylinder alters the flow field downstream of the cylinder in a manner that makes it more susceptible to acoustic excitation.
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October 2015
Research-Article
Aeroacoustic Response of a Single Cylinder With Straight Circular Fins in Cross-Flow
Nadim Arafa,
Nadim Arafa
1
Faculty of Engineering and Applied Science,
2000 Simcoe Street North,
e-mail: nadim.arafa@uoit.ca
University of Ontario Institute of Technology
,2000 Simcoe Street North,
Oshawa, ON L1H7K4
, Canada
e-mail: nadim.arafa@uoit.ca
1Corresponding author.
Search for other works by this author on:
Atef Mohany
Atef Mohany
Faculty of Engineering and Applied Science,
2000 Simcoe Street North,
e-mail: atef.mohany@uoit.ca
University of Ontario Institute of Technology
,2000 Simcoe Street North,
Oshawa, ON L1H7K4
, Canada
e-mail: atef.mohany@uoit.ca
Search for other works by this author on:
Nadim Arafa
Faculty of Engineering and Applied Science,
2000 Simcoe Street North,
e-mail: nadim.arafa@uoit.ca
University of Ontario Institute of Technology
,2000 Simcoe Street North,
Oshawa, ON L1H7K4
, Canada
e-mail: nadim.arafa@uoit.ca
Atef Mohany
Faculty of Engineering and Applied Science,
2000 Simcoe Street North,
e-mail: atef.mohany@uoit.ca
University of Ontario Institute of Technology
,2000 Simcoe Street North,
Oshawa, ON L1H7K4
, Canada
e-mail: atef.mohany@uoit.ca
1Corresponding author.
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 10, 2014; final manuscript received January 9, 2015; published online February 24, 2015. Assoc. Editor: Jong Chull Jo.
J. Pressure Vessel Technol. Oct 2015, 137(5): 051301 (8 pages)
Published Online: October 1, 2015
Article history
Received:
September 10, 2014
Revision Received:
January 9, 2015
Online:
February 24, 2015
Citation
Arafa, N., and Mohany, A. (October 1, 2015). "Aeroacoustic Response of a Single Cylinder With Straight Circular Fins in Cross-Flow." ASME. J. Pressure Vessel Technol. October 2015; 137(5): 051301. https://doi.org/10.1115/1.4029658
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