Study of Tonal Fan Noise Reduction by Modification of the Volute Cutoff

2010 ◽  
Vol 96 (6) ◽  
pp. 1115-1124 ◽  
Author(s):  
Jiancheng Cai ◽  
Datong Qi ◽  
Fuan Lu ◽  
Xuanfeng Wen
Keyword(s):  
Noise Reduction ◽  
Fan Noise

Bypass duct fan noise reduction assembly

2003 ◽  
Vol 113 (4) ◽  
pp. 1788
Author(s):  
Man-Chun Tse
Keyword(s):  
Noise Reduction ◽  
Fan Noise

Condenser fan noise reduction solutions

2000 ◽  
Vol 108 (5) ◽  
pp. 2461-2461
Author(s):  
Michael Bobeczko
Keyword(s):  
Noise Reduction ◽  
Fan Noise

scholarly journals Benefits of swept and leaned stators for fan noise reduction

1999 ◽  
Author(s):  
Richard Woodward ◽  
David Elliot ◽  
Christopher Hughes ◽  
Jeffrey Berton
Keyword(s):  
Noise Reduction ◽  
Fan Noise

scholarly journals Fan Noise Reduction: An Overview

2002 ◽  
Vol 1 (1) ◽  
pp. 43-64 ◽  
Author(s):  
Edmane Envia
Keyword(s):  
Noise Reduction ◽  
Fan Noise

Fan Noise Reduction with Increased Bypass Nozzle Area

2006 ◽  
Vol 43 (6) ◽  
pp. 1719-1725 ◽  
Author(s):  
Richard P. Woodward ◽  
Christopher E. Hughes ◽  
Gary G. Podboy
Keyword(s):  
Noise Reduction ◽  
Fan Noise

Fan noise reduction of household refrigerator

1992 ◽  
Vol 28 (2) ◽  
pp. 287-292 ◽  
Author(s):  
A. Takushima ◽  
Y. Shinobu ◽  
S. Tanaka ◽  
M. Eguchi ◽  
K. Matsuki
Keyword(s):  
Noise Reduction ◽  
Fan Noise

scholarly journals Study on Low-Noise Fan. Noise Reduction of Pusher-Type Condenser Cooling Fan.

1993 ◽  
Vol 59 (558) ◽  
pp. 453-459 ◽  
Author(s):  
Kiyoshi Kawaguchi ◽  
Shigeru Kadota ◽  
Masahiko Suzuki ◽  
Kazuma Matsui ◽  
Koji Kikuyama
Keyword(s):  
Noise Reduction ◽  
Low Noise ◽  
Fan Noise ◽  
Cooling Fan

Numerical Analysis of an Industrial Fan Fitted With Noise Reduction Devices

2006 ◽  
Author(s):  
J. Amaral Teixeira ◽  
E. Naylor ◽  
P. C. Ivey ◽  
A. G. Sheard ◽  
I. R. Kinghorn
Keyword(s):  
Numerical Analysis ◽  
Noise Reduction ◽  
Flow Characteristics ◽  
Pressure Rise ◽  
Broadband Noise ◽  
Noise Sources ◽  
Fan Noise ◽  
Trailing Edge ◽  
Low Speed ◽  
The Individual

The reduction of noise emitted by industrial low speed cooling fans, particularly those fitted to air conditioning systems is a concern to fan manufacturers. The market for industrial low speed fans is highly competitive, with fan noise being the major differentiating factor between competing products. Noise reduction strategies are therefore implemented but these can adversely affect the fan’s pressure delivery capability. A reduction of fan speed can also lead to a reduction in fan noise but this is usually accompanied by a corresponding reduction in pressure rise and flow rate. The practical difficulties associated with maintaining fan pressure and flow characteristics while simultaneously reducing fan noise present fan manufacturers with a challenge. Traditional empirical approaches to the reduction of fan noise have almost been exhausted and no longer offer the potential to significantly reduce fan noise. The understanding of the aerodynamic mechanisms that act as broadband noise sources in low speed fans has been the subject of a considerable number of papers over many years. For most fans operating as a single blade row, the main sources of noise, other than those dependent on the incident turbulence levels, depend on the trailing edge and tip gap flow conditions. A range of strategies seeking to control the noise generated by these regions have been proposed over time by various authors and a number of these schemes have reached production status. The current paper details the numerical analysis of an industrial low speed fan, commonly used in conjunction with a cooling matrix, and which incorporates two distinct noise reduction features; trailing edge crenulations and a blade tip fence. Comparisons are carried out between various combinations of blades, with and without the individual features, and a discussion of the aerodynamics of the particular configurations is undertaken from a perspective of their noise reduction capabilities.

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