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Suppression of tonal noise in a centrifugal fan using guide vanes

This paper presents the work aiming for tonal noise reduction in a centrifugal fan. In previous studies, it is well documented that tonal noise is the dominant noise source generated in centrifugal fans. Tonal noise is generated due to the aerodynamic interaction between the rotating impeller and st...

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Main Authors:	Paramasivam, Kishokanna, Rajoo, S., Romagnoli, Alessandro
Format:	Article
Language:	English
Published:	Academic Press Inc. 2015
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/56216/1/KishokannaParamasivam2015_SuppressionofTonalNoiseinaCentrifugalFanUsingGuideVanes.pdf http://eprints.utm.my/id/eprint/56216/ http://dx.doi.org/10.1016/j.jsv.2015.07.003
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spelling	my.utm.562162016-11-22T03:02:37Z http://eprints.utm.my/id/eprint/56216/ Suppression of tonal noise in a centrifugal fan using guide vanes Paramasivam, Kishokanna Rajoo, S. Romagnoli, Alessandro TJ Mechanical engineering and machinery This paper presents the work aiming for tonal noise reduction in a centrifugal fan. In previous studies, it is well documented that tonal noise is the dominant noise source generated in centrifugal fans. Tonal noise is generated due to the aerodynamic interaction between the rotating impeller and stationary diffuser vanes. The generation of tonal noise is related to the pressure fluctuation at the leading edge of the stationary vane. The tonal noise is periodic in time which occurs at the blade passing frequency (BPF) and its harmonics. Much of previous studies, have shown that the stationary vane causes the tonal noise and generation of non-rotational turbulent noise. However, omitting stationary vanes will lead to the increase of non-rotational turbulent noise resulted from the high velocity of the flow leaving the impeller. Hence in order to reduce the tonal noise and the non-rotational noise, guide vanes were designed as part of this study to replace the diffuser vanes, which were originally used in the chosen centrifugal fan. The leading edge of the guide vane is tapered. This modification reduces the strength of pressure fluctuation resulting from the interaction between the impeller outflow and stationary vane. The sound pressure level at blade passing frequency (BPF) is reduced by 6.8 dB, the 2nd BPF is reduced by 4.1 dB and the 3rd BPF reduced by about 17.5 dB. The overall reduction was 0.9 dB. The centrifugal fan with tapered guide vanes radiates lower tonal noise compared to the existing diffuser vanes. These reductions are achieved without compromising the performance of the centrifugal fan. The behavior of the fluid flow was studied using computational fluid dynamics (CFD) tools and the acoustics characteristics were determined through experiments in an anechoic chamber. Academic Press Inc. 2015-11-24 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/56216/1/KishokannaParamasivam2015_SuppressionofTonalNoiseinaCentrifugalFanUsingGuideVanes.pdf Paramasivam, Kishokanna and Rajoo, S. and Romagnoli, Alessandro (2015) Suppression of tonal noise in a centrifugal fan using guide vanes. Journal of Sound and Vibration, 357 . pp. 95-106. ISSN 0022-460X http://dx.doi.org/10.1016/j.jsv.2015.07.003 DOI:10.1016/j.jsv.2015.07.003
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Paramasivam, Kishokanna Rajoo, S. Romagnoli, Alessandro Suppression of tonal noise in a centrifugal fan using guide vanes
description	This paper presents the work aiming for tonal noise reduction in a centrifugal fan. In previous studies, it is well documented that tonal noise is the dominant noise source generated in centrifugal fans. Tonal noise is generated due to the aerodynamic interaction between the rotating impeller and stationary diffuser vanes. The generation of tonal noise is related to the pressure fluctuation at the leading edge of the stationary vane. The tonal noise is periodic in time which occurs at the blade passing frequency (BPF) and its harmonics. Much of previous studies, have shown that the stationary vane causes the tonal noise and generation of non-rotational turbulent noise. However, omitting stationary vanes will lead to the increase of non-rotational turbulent noise resulted from the high velocity of the flow leaving the impeller. Hence in order to reduce the tonal noise and the non-rotational noise, guide vanes were designed as part of this study to replace the diffuser vanes, which were originally used in the chosen centrifugal fan. The leading edge of the guide vane is tapered. This modification reduces the strength of pressure fluctuation resulting from the interaction between the impeller outflow and stationary vane. The sound pressure level at blade passing frequency (BPF) is reduced by 6.8 dB, the 2nd BPF is reduced by 4.1 dB and the 3rd BPF reduced by about 17.5 dB. The overall reduction was 0.9 dB. The centrifugal fan with tapered guide vanes radiates lower tonal noise compared to the existing diffuser vanes. These reductions are achieved without compromising the performance of the centrifugal fan. The behavior of the fluid flow was studied using computational fluid dynamics (CFD) tools and the acoustics characteristics were determined through experiments in an anechoic chamber.
format	Article
author	Paramasivam, Kishokanna Rajoo, S. Romagnoli, Alessandro
author_facet	Paramasivam, Kishokanna Rajoo, S. Romagnoli, Alessandro
author_sort	Paramasivam, Kishokanna
title	Suppression of tonal noise in a centrifugal fan using guide vanes
title_short	Suppression of tonal noise in a centrifugal fan using guide vanes
title_full	Suppression of tonal noise in a centrifugal fan using guide vanes
title_fullStr	Suppression of tonal noise in a centrifugal fan using guide vanes
title_full_unstemmed	Suppression of tonal noise in a centrifugal fan using guide vanes
title_sort	suppression of tonal noise in a centrifugal fan using guide vanes
publisher	Academic Press Inc.
publishDate	2015
url	http://eprints.utm.my/id/eprint/56216/1/KishokannaParamasivam2015_SuppressionofTonalNoiseinaCentrifugalFanUsingGuideVanes.pdf http://eprints.utm.my/id/eprint/56216/ http://dx.doi.org/10.1016/j.jsv.2015.07.003
_version_	1643654029623951360
score	13.211869

Suppression of tonal noise in a centrifugal fan using guide vanes

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