Discrete Frequency Noise Generation From an Axial Flow Fan Blade Row

[+] Author and Article Information
Ramani Mani

General Electric Research and Development Center, Schenectady, N. Y.

J. Basic Eng 92(1), 37-43 (Mar 01, 1970) (7 pages) doi:10.1115/1.3424944 History: Received March 13, 1969; Online October 27, 2010


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.

Copyright © 1970 by ASME
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