Axial flow fan

Details Axial flow fan Axial flow fan

1982-05-17

1984-10-02

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Unsymmetrical impeller or dissimilar working members

415219R, F04D 2932, F04D 2966

Patent

active

044745346

ABSTRACT:
An axial flow fan has a plurality of impeller blades spaced around a hub assembly. The leading edge of each blade overlaps completely the trailing edge of the preceding blade, and the angular spacing between the radial center lines of the blades is unequal, preferably varying in a sinusoidal pattern, so that tonal noise of the fan is effectively attenuated.

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Article entitled "Low Pressure Ratio Fan Noise Experiment and Theory" by F. B. Metzger & D. B. Hanson ASME Publication 72-GT-40, pp. 19-25.
Article entitled "The Mechanisms of Noise Generation in a Compressor Model" by B. T. Hulse & J. B. Large, ASME Publication 66-GT/N-42, pp. 1-7.
Article entitled "Sound Generation in Subsonic Turbomachinery" by C. L. Morfey, ASME Publication 69-WA/FE-4, pp. 1-9.
Article entitled "Fan Compressor Noise Reduction" by M. J. Benzakein & S. B. Kazin, ASME Publication 69-GT-9, pp. 1-9.
Article entitled "Analytical Prediction of Fan/Compressor Noise" by M. J. Benzakein & W. R. Morgan, ASME Publication 69-WA/GT-10, pp. 1-8.
Article entitled "Discrete Frequency Noise Generation from an Axial Flow Fan Blade Row" by Ramani Mani, ASME Publication 69-FE-12, pp. 1-7.
Article entitled "Controlling The Tonal Characteristics of the Aerodynamic Noise Generated by Fan Rotors" by R. C. Mellin & G. Sovran, ASME Publication 69-WA/FE-23, pp. 1-12.
Article entitled "Procedure for Optimum Design in Relation to Noise for Low-Speed Ducted Fans" by C. G. van Niekerk, ASME Publication, 69-WA/GT-4, pp. 1-7.
Article entitled "Lifting Fan Noise Studies" by G. Krishnappa & G. G. Levy, ASME Publication, 69-WA/GT-6, pp. 1-9.

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