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Shock-Wave Radiation from a Supersonic Ducted Rotor

Published online by Cambridge University Press:  04 July 2016

C. L. Morfey  and
M. J. Fisher
C. L. Morfey
Affiliation:
Institute of Sound and Vibration Research, The University, Southampton
M. J. Fisher
Affiliation:
Institute of Sound and Vibration Research, The University, Southampton
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Extract

Over the subsonic speed range, the pressure field attached to a ducted rotor decays rapidly with distance away from the rotor. This exponential decay, coupled with the low radiation efficiency of a subsonically rotating pressure pattern, is generally sufficient to bring the radiated sound power well below that produced by interaction of the rotor with disturbances in the flow. This is particularly true for multibladed rotors as used in aircraft-engine fans and compressors, and accounts for the importance of rotor-stator interaction as a source of noise at subsonic tip speeds.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 74 , Issue 715 , July 1970 , pp. 579 - 585
Copyright
Copyright © Royal Aeronautical Society 1970 

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