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

Ali, Mohamed Sukri Mat Ali, Doolan, Con J. and Wheatley, Vincent (2011). Aeolian tones generated by a square cylinder with a detached flat plate. In: 17th AIAA/CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference). 17th AIAA/CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference), Portland, OR, United States, (1-25). 5-8 June 2011.

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Author Ali, Mohamed Sukri Mat Ali
Doolan, Con J.
Wheatley, Vincent
Title of paper Aeolian tones generated by a square cylinder with a detached flat plate
Conference name 17th AIAA/CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference)
Conference location Portland, OR, United States
Conference dates 5-8 June 2011
Proceedings title 17th AIAA/CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference)
Place of Publication Reston, VA, United States
Publisher AIAA - American Institute of Aeronautics and Astronautics
Publication Year 2011
Sub-type Fully published paper
Start page 1
End page 25
Total pages 25
Collection year 2012
Language eng
Abstract/Summary A possibility of a rigid flat plate that is placed in the wake of a square cylinder for a passive sound control is investigated numerically. The changes in the sound generation with gap distances are inspected at a Reynolds number of 150 and a Mach number of 0.2 for a constant plate length of D. Two regimes that significantly effects the sound generation are identified. The first regime, i.e. pre-vortex regime, is for 0 G 2.3D and the second regime, i.e. post-vortex regime, is for 2.4D G 7D. A sound reduction can be obtained in pre-vortex regime, where about 2.9 dB sound reduction is obtained when there is no gap between the two bodies. Contrary, at least an increase 8.0 dB sound level is emitted when the plate is placed in the post-vortex regime. Despite of that, a 6.3 dB sound reduction is obtained when the plate length is reduced to 0.26D and placed at 5.6D downstream of the cylinder. The sound reduction is limited by the deformation in the sinusoidal signal of the plate due to the unsteady plate stall process.
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Paper number: AIAA-2011-2779

Document type: Conference Paper
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Thu, 13 Oct 2011, 16:27:46 EST by Dr Vincent Wheatley on behalf of School of Mechanical and Mining Engineering