Experimental study of aerodynamic noise from the trailing edge and leading edge of blades in a coaxial-double shaft fan

Madadnia, J; Shekeb, M; Ulluwishewa, T

Experimental study of aerodynamic noise from the trailing edge and leading edge of blades in a coaxial-double shaft fan

Madadnia, J Shekeb, M Ulluwishewa, T

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Publication Type:: Conference Proceeding
Citation:: American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM, 2013, 1 B
Issue Date:: 2013-12-01

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Field	Value	Language
dc.contributor.author	Madadnia, J	en_US
dc.contributor.author	Shekeb, M	en_US
dc.contributor.author	Ulluwishewa, T	en_US
dc.date.issued	2013-12-01	en_US
dc.identifier.citation	American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM, 2013, 1 B	en_US
dc.identifier.isbn	9780791855553	en_US
dc.identifier.issn	0888-8116	en_US
dc.identifier.uri	http://hdl.handle.net/10453/27999
dc.description.abstract	Proactive acoustic noise control technologies in wind turbines and blowers have in recent years been the focus of intensive research to integrate wind turbines in residential building and to address public concerns on noise pollution. However efforts to understand the mechanics has been inconclusive, mainly due to the complexity and commercial confidentiality of the topic The paper reports on the experimental investigation on two methods in controlling aerodynamic noise. A counter-rotating-double-row-turbine with variable gap/spacing (s) was designed, built and tested. Serrations were designed and attached on the leading edge and the trailing edge of the blades to proactively control aerodynamic noise. The model was operated in fan-mode and air velocity, shaft-revolution; electric-fan-power, acoustic noise amplitude (dB) and Centre frequency (CF in Hz) were measured for a number of spacing and serrations. Coefficients of Performance (COP), dB, CF were plotted against tip speed (TS). It was noticed that: • The double-shaft-fan has operated quieter than the single shaft fan especially as TS decreases. Acoustic noise (dB) dropped 20% at TS=4m/s to less than 2% at TS=10m/s. Efficiency and CF increased in the double-shaft fan as TS increased. Spacing variation between blade-rows had insignificant effect on the dB, Cf, and efficiency. • Serrations on single-shaft fan have also reduced dB (up to 10%), increased efficiency and CF with more positive effects with the serrations on the leading edge than the trailing edge. Serrations are more effective at higher TS range. • Serrations on a double-shaft fan with an optimum spacing, reduced acoustic noise (dB) only allow speeds [at TS <4m/s]. However minor improvement was noticed in efficiency or noise frequency. Copyright © 2013 by ASME.	en_US
dc.relation.ispartof	American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM	en_US
dc.relation.isbasedon	10.1115/FEDSM2013-16429	en_US
dc.subject.classification	Mechanical Engineering & Transports	en_US
dc.title	Experimental study of aerodynamic noise from the trailing edge and leading edge of blades in a coaxial-double shaft fan	en_US
dc.type	Conference Proceeding
utslib.citation.volume	1 B	en_US
utslib.for	0913 Mechanical Engineering	en_US
dc.location.activity	Incline Village, Nevada, USA	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	1 B	en_US

Abstract:

Proactive acoustic noise control technologies in wind turbines and blowers have in recent years been the focus of intensive research to integrate wind turbines in residential building and to address public concerns on noise pollution. However efforts to understand the mechanics has been inconclusive, mainly due to the complexity and commercial confidentiality of the topic The paper reports on the experimental investigation on two methods in controlling aerodynamic noise. A counter-rotating-double-row-turbine with variable gap/spacing (s) was designed, built and tested. Serrations were designed and attached on the leading edge and the trailing edge of the blades to proactively control aerodynamic noise. The model was operated in fan-mode and air velocity, shaft-revolution; electric-fan-power, acoustic noise amplitude (dB) and Centre frequency (CF in Hz) were measured for a number of spacing and serrations. Coefficients of Performance (COP), dB, CF were plotted against tip speed (TS). It was noticed that: • The double-shaft-fan has operated quieter than the single shaft fan especially as TS decreases. Acoustic noise (dB) dropped 20% at TS=4m/s to less than 2% at TS=10m/s. Efficiency and CF increased in the double-shaft fan as TS increased. Spacing variation between blade-rows had insignificant effect on the dB, Cf, and efficiency. • Serrations on single-shaft fan have also reduced dB (up to 10%), increased efficiency and CF with more positive effects with the serrations on the leading edge than the trailing edge. Serrations are more effective at higher TS range. • Serrations on a double-shaft fan with an optimum spacing, reduced acoustic noise (dB) only allow speeds [at TS <4m/s]. However minor improvement was noticed in efficiency or noise frequency. Copyright © 2013 by ASME.

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http://hdl.handle.net/10453/27999