Experimental study of aerodynamic noise from a double shaft fan

Madadnia, J; Alshehri, F; Tilwa, K

Experimental study of aerodynamic noise from a double shaft fan

Madadnia, J Alshehri, F Tilwa, K

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Publication Type:: Conference Proceeding
Citation:: American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM, 2012, 1 (PARTS A AND B), pp. 461 - 468
Issue Date:: 2012-12-01

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Field	Value	Language
dc.contributor.author	Madadnia, J	en_US
dc.contributor.author	Alshehri, F	en_US
dc.contributor.author	Tilwa, K	en_US
dc.date.issued	2012-12-01	en_US
dc.identifier.citation	American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM, 2012, 1 (PARTS A AND B), pp. 461 - 468	en_US
dc.identifier.isbn	9780791844755	en_US
dc.identifier.issn	0888-8116	en_US
dc.identifier.uri	http://hdl.handle.net/10453/31184
dc.description.abstract	Noise pollution from wind turbines and blowers operating in the vicinity of residential buildings has in recent years been the focus of intensive research. This paper reports on the outcome of an experimental investigation to reduce the noise pollution through design, build and testing of a counter-rotating- double-row-fan with variable spacing. A single-row fan was selected as the benchmark fan. The mechanical noise and the background ambient noise were measured using the system operating with no-blades. The aerodynamic noise from the fan was then focused and air velocity, shaft-revolution, input-electric-power to fan, amplitude (dB) and Center Frequency (CF) in Hz of noise were measured using frequency-weighting of both "A" and "Linear". Coefficients of performance (COP), dB, CF, Tip speed ratio (TSR) were plotted for a range of spacing between two-blade-rows. It was noticed that double-shaft-fan relative to the benchmark single shaft fan has operated a) At a lower TSR due to division of the motor power between two shafts. b) At a higher COP of up to 18% due to a higher air velocity generated at the same motor power. c) Quieter at a lower dB (of up to 10 dB). d) At the minimum noise levels (80 dB) at the spacing of 15mm-to-25mm, using the "Lin"- weighting e) At the minimum noise levels (20 dB) at the spacing of 12mm-to 50 mm when measured at the "A"-weighting f) With no significant change in frequency of noise when operate at the same TSR. Copyright © 2012 by ASME.	en_US
dc.relation.ispartof	American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM	en_US
dc.relation.isbasedon	10.1115/FEDSM2012-72197	en_US
dc.subject.classification	Mechanical Engineering & Transports	en_US
dc.title	Experimental study of aerodynamic noise from a double shaft fan	en_US
dc.type	Conference Proceeding
utslib.citation.volume	PARTS A AND B	en_US
utslib.citation.volume	1	en_US
utslib.for	09 Engineering	en_US
utslib.for	091504 Fluidisation and Fluid Mechanics	en_US
utslib.for	0915 Interdisciplinary Engineering	en_US
dc.location.activity	Rio Grande, Puerto Rico
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.issue	PARTS A AND B	en_US
pubs.publication-status	Published	en_US
pubs.volume	1	en_US

Abstract:

Noise pollution from wind turbines and blowers operating in the vicinity of residential buildings has in recent years been the focus of intensive research. This paper reports on the outcome of an experimental investigation to reduce the noise pollution through design, build and testing of a counter-rotating- double-row-fan with variable spacing. A single-row fan was selected as the benchmark fan. The mechanical noise and the background ambient noise were measured using the system operating with no-blades. The aerodynamic noise from the fan was then focused and air velocity, shaft-revolution, input-electric-power to fan, amplitude (dB) and Center Frequency (CF) in Hz of noise were measured using frequency-weighting of both "A" and "Linear". Coefficients of performance (COP), dB, CF, Tip speed ratio (TSR) were plotted for a range of spacing between two-blade-rows. It was noticed that double-shaft-fan relative to the benchmark single shaft fan has operated a) At a lower TSR due to division of the motor power between two shafts. b) At a higher COP of up to 18% due to a higher air velocity generated at the same motor power. c) Quieter at a lower dB (of up to 10 dB). d) At the minimum noise levels (80 dB) at the spacing of 15mm-to-25mm, using the "Lin"- weighting e) At the minimum noise levels (20 dB) at the spacing of 12mm-to 50 mm when measured at the "A"-weighting f) With no significant change in frequency of noise when operate at the same TSR. Copyright © 2012 by ASME.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/31184