NDLI: Experimental Study of Aerodynamic Noise From a Double Shaft Fan

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Madadnia, Jafar Alshehri, Faisal Tilwa, Kaushik
Copyright Year	2012
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.
Sponsorship	Fluids Engineering Division
Starting Page	461
Ending Page	468
Page Count	8
File Format	PDF
ISBN	9780791844755
DOI	10.1115/FEDSM2012-72197
Volume Number	Volume 1: Symposia, Parts A and B
Conference Proceedings	ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels
Language	English
Publisher Date	2012-07-08
Publisher Place	Rio Grande, Puerto Rico, USA
Access Restriction	Subscribed
Subject Keyword	Aerodynamic noise Co-axial-double-shaft fans or turbine Acoustic noise Low frequency noise Noise (sound)
Content Type	Text
Resource Type	Article

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