Effects of Acoustic Loading on Axial Flow Fan Noise Generation

1977 ◽  
Vol 8 (1) ◽  
pp. 5 ◽  
Author(s):  
Peter K. Baade
Keyword(s):  
Axial Flow ◽  
Noise Generation ◽  
Axial Flow Fan ◽  
Fan Noise

Discrete Frequency Noise Generation From an Axial Flow Fan Blade Row

1970 ◽  
Vol 92 (1) ◽  
pp. 37-43 ◽  
Author(s):  
Ramani Mani
Keyword(s):  
Three Dimensional ◽  
Axial Flow ◽  
Acoustic Energy ◽  
Frequency Noise ◽  
Noise Generation ◽  
Two Dimensional ◽  
Axial Flow Fan ◽  
Fan Noise ◽  
Blade Row ◽  
Fan Blade

An analysis is presented which treats the noise generation from an axial flow fan row by given forces including the effects of a moving medium. The linearization of Euler’s equations to yield tractable problems for fan noise is discussed. The three-dimensional problem is decomposed into several two-dimensional problems. Finally, full details are given of a two-dimensional analysis to predict the amounts of acoustic energy, at the blade passing frequency and its harmonics, radiated up and downstream of a blade row due to its interaction with a neighboring row.

scholarly journals Axial Flow Fan Noise Studies

1972 ◽  
Vol 38 (312) ◽  
pp. 2093-2101
Author(s):  
Kang Rae CHO ◽  
Susumu MURATA
Keyword(s):  
Axial Flow ◽  
Axial Flow Fan ◽  
Fan Noise

Application of casing treatment to an industrial axial-flow fan

1998 ◽  
Vol 212 (4) ◽  
pp. 225-233 ◽  
Author(s):  
S D Hill ◽  
R L Elder ◽  
A B McKenzie
Keyword(s):  
Axial Flow ◽  
Rotating Stall ◽  
Strain Gauges ◽  
Axial Flow Fan ◽  
Fan Noise ◽  
Flow Measurements ◽  
Casing Treatment ◽  
Blade Tip ◽  
Fan Blade ◽  
Insight Into

This paper deals with an experimental investigation into the influence of a vaned recess casing treatment on the performance of an industrial-type axial-flow fan with a hub-tip ratio of 0.4. The treatment has been tested in a variety of configurations relative to the fan, with an emphasis on the amount of fan blade tip exposure to the treatment. Two sets of blading, one of which is of the fully reversible type, have been investigated. Detailed flow measurements have been carried out with a slanted hot wire probe to provide an insight into the operation of the device and into the nature of the rotating stall in the solid casing configuration. Strain gauges have been employed to enable blade stresses to be recorded and an in-duct microphone to enable comparative tests on fan noise has also been used.

Propagation Character and Active Control of Axial-Flow Fan Noise

2000 ◽  
Vol 2000.1 (0) ◽  
pp. 955-956
Author(s):  
Kazuhiro TANIDA ◽  
Kazuo MATSUUCHI ◽  
Masakazu WATANABE ◽  
Noboru MATSUDA
Keyword(s):  
Active Control ◽  
Axial Flow ◽  
Axial Flow Fan ◽  
Fan Noise

An investigation of axial flow fan noise

1966 ◽  
Vol 3 (2) ◽  
pp. 147-165 ◽  
Author(s):  
N.le S. Filleul
Keyword(s):  
Axial Flow ◽  
Axial Flow Fan ◽  
Fan Noise

Control of Axial Flow Fan Noise by Design

1994 ◽  
Vol 1 (4) ◽  
pp. 271-278
Author(s):  
P.J. Hunnaball
Keyword(s):  
Noise Level ◽  
Axial Flow ◽  
Radial Clearance ◽  
Noise Levels ◽  
Tonal Noise ◽  
Axial Flow Fan ◽  
Fan Noise ◽  
Basic Parameters ◽  
Selection Of

This paper discusses the present methods of controlling tonal noise in axial flow fans and puts forward some basic parameters for use in the design and selection of this product. Descriptions are given of the effects of fan casing geometry, the interaction of fixed duct elements and fan rotating parts, the effect of inlet disturbance and changes in noise level with radial clearance. Finally, guidelines are given for users of axial How fans in order to minimise noise levels.

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