The effect of the vibrissa shaped cylinder on the aeolian tone mitigation

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Abstract

This paper studies vibrissa shaped cylinder as a passive control method for reducing the aerodynamic noise of the flow past a cylinder. One elliptical cylinder and a circular cylinder are also investigated for comparison. The far-field noise results show that compared with the circular cylinder case, the tonal peak almost disappears in the vibrissa shaped cylinder case and the sound pressure level (SPL) could be reduced by about 20dB at Re"≈" 36,000. The elliptical cylinder only shows a slight SPL reduction by about 4 dB with a shift in the tonal peak frequency from St=0.2 to St=0.36. Furthermore, some noticeable variations occur in the noise directivity pattern for the vibrissa shaped cylinder case. The shift in the tonal peak frequency, the reduction in noise and modifications in the noise directivity are related to the changing and breakdown of the vortex shedding caused by the interference with the elliptical and vibrissa shaped cylinder surfaces. The PIV experiments are conducted to the three cases for the flow field information to further understand the mechanism of the noise reduction caused by the vibrissa shaped cylinder and the elliptical cylinder.
Original languageEnglish
Title of host publicationProceedings: Internoise 2022
PublisherInstitute of Noise Control Engineering
Pages1-8
Number of pages8
ISBN (Print)978-1-906913-42-7
Publication statusPublished - 21 Aug 2022
Event51st International Congress and Exposition on Noise Control Engineering - Scottish Event Campus, Glasgow, United Kingdom
Duration: 21 Aug 202224 Aug 2022
Conference number: 51
https://internoise2022.org/

Publication series

NameInternational Conference on Noise Control Engineering - Inter-noise
ISSN (Print)0105-175X

Conference

Conference51st International Congress and Exposition on Noise Control Engineering
Abbreviated titleInter.noise 2022
Country/TerritoryUnited Kingdom
CityGlasgow
Period21/08/2224/08/22
Internet address

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