Aeolian tones generated by a square cylinder with a detached flat plate

Ali, Mohamed Sukri Mat, Doolan, Con J. and Wheatley, Vincent (2013) Aeolian tones generated by a square cylinder with a detached flat plate. AIAA Journal, 51 2: 291-301. doi:10.2514/1.J051378


Author Ali, Mohamed Sukri Mat
Doolan, Con J.
Wheatley, Vincent
Title Aeolian tones generated by a square cylinder with a detached flat plate
Journal name AIAA Journal   Check publisher's open access policy
ISSN 0001-1452
1533-385X
Publication date 2013-02
Sub-type Article (original research)
DOI 10.2514/1.J051378
Volume 51
Issue 2
Start page 291
End page 301
Total pages 11
Place of publication Reston, VA, United States
Publisher American Institute of Aeronautics and Astronautics
Collection year 2014
Language eng
Abstract The case of a rigid flat plate placed in the wake of a square cylinder for passive sound control is investigated numerically at a Reynolds number of 150 and a Mach number of 0.2. Two flow regimes are observed, and these are shown to affect the radiated sound. An overall sound reduction at an observer directly above the cylinder is observed for a small gap distance G between the cylinder and the plate (0 ≤ G ≤ 2.3D, in which D is the cylinder height), where a 2.9 dB reduction in the sound-pressure level is obtained when there is no gap between the two bodies. In contrast, the emitted sound-pressure level increases by at least 8.0 dB for large gap distances (2.4D ≤ G ≤ 7D). Despite this, a 6.3 dB reduction in the sound-pressure level is obtained due to a sound-cancellation mechanism when the plate length is reduced to 0.26D and placed 5.6D downstream of the cylinder. The maximum sound reduction attainable is shown to be limited by the nonlinear unsteady stall process on the plate.
Keyword Passive sound control
Radiated sound
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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