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An investigation of axial flow fan noise
Journal of Sound and Vibration, 1966Abstract Measurements of noise from fans designed for military vehicle cooling installations have been made. Two fan rotors in particular have been run under varied test conditions. The main parameters investigated were tip speed, tip clearance, back pressure, blade stagger angle, the presence of inlet and outlet struts, and number of blades.
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Sources of noise in axial flow fans
Journal of Sound and Vibration, 1964Abstract The various possible mechanisms of noise generation in axial flow fans are described. Quantitative expressions have been derived for the sources of broad band noise by dimensional arguments, from which orders of magnitude estimates have been made.
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Axial Flow Fan Design by Lattice Theory
1935This thesis takes the much discussed and comparatively little used lattice theory and applies it to the design of fans. The application is made through the use of charts coming out of the theory. It is felt that by the use of the charts that the design of confined fans, that is those where end effects on the blades need not be considered, will be ...
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Control of Axial Flow Fan Noise by Design
Building Acoustics, 1994This 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 ...
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Quieting of axial flow fans through blade design
The Journal of the Acoustical Society of America, 1981The noise of an axial fan can be significantly reduced by carefully designing the blade shape for the local fan environment. Reduction in both the broadband spectrum of fan noise and of fan tones by >8 dBA are achievable, with no loss in fan efficiency.
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Estimation of Scale Effects in Axial Flow Fans
Aircraft Engineering and Aerospace Technology, 1961The losses in a fan unit consisting of rotor, guide vanes and tail fairing have been studied and the average losses are expressed in terms of non‐dimensional similarity parameters, frequently referred to as ‘fan laws’. It was found that for a specified duty and fan geometry the losses depend on: (a) The magnitude of the lift‐drag ratio of the rotor ...
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