Abstract
By means of a linearized theory for aerodynamic sound generation, the power output from sources operating in a duct is expressed in terms of duct modes. For axial fans, it is possible to infer from geometrical and cutoff considerations which are the dominant modes responsible for both broad-band and tone radiation; the inference is checked by measurements of farfield radiation patterns around fan inlets, which agree with the directivity predicted for the appropriate duct modes. With this information, different mechanisms of fan- and compressor-noise generation can be distinguished, and order-of-magnitude estimates made of the power output from each mechanism.
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