Results 271 to 280 of about 93,869 (311)
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Flow characteristics of axial fan with shroud
Journal of Fluid Machinery, 2008Axial fan without static blades requires the duct as a guidance for unskewed inflows. This work examined the geometric effects of a duct guided the in and out flows through an impeller. The present methodologies are computational predictions with parallel work by experimental validation. Several different positions of a rotor in a duct are proposed for
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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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Axial flow fan noise caused by inlet flow distortion
Journal of Sound and Vibration, 1975Flow distortions at the inlet of an axial flow fan will cause discrete tone noise generation at shaft rotational frequencies. Controlled experiments have been carried out to check the validity of existing theories to predict these tone levels. The results have shown satisfactory agreement at low frequencies for a concentrated force representation of ...
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High efficiency, low axial profile, low noise, axial flow fan
The Journal of the Acoustical Society of America, 1995The fan blades have a particular geometry that combines high efficiency, low axial profile, and low noise in an axial flow fan. The fan also comprises a circular outer band that coacts with a surrounding shroud structure to form a labyrinth air seal.
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