On the sound field generated by a fan in a hard-walled baffled duct with uniform flow

Report (1978)

Authors

J.N. Laan

Reflection Directivity Mathematical models Wakes Acoustic properties Acoustic ducts Ducted fans Far fields Sound propagation Sound fields Sound pressure Turbo fans F-28 transport aircraft Density distribution Rotor blades (turbomachinery) Spey Mk-555 engine Prediction analysis techniques

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Published Date

22-02-1978

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Source:

NLR-TR 78024 U

Abstract

The present status of a method to calculate the generation, transmission and radiation of fan noise is described. A steady uniform flow is assumed in the whole field. A hard-walled circular duct is considered which is terminated at the open end by an infinite baffle. The source mechanism is the impingement of wakes from an upstream blade row giving rise to fluctuating bldde forces. This force field drives the sound field. The method is illustrated by means of numerical examples.

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