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The effect of blade sweep on the reduction and enhancement of supersonic propeller noise

Published online by Cambridge University Press:  26 April 2006

A. B. Parry
A. B. Parry
Affiliation:
Department of Mathematics, University of Strathclyde, Glasgow G1 1XH, UK
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Abstract

An asymptotic frequency-domain approach is used to describe the radiation from a supersonic swept propeller within the framework of linear acoustics. With this approach the radiation of singularities, their points of origin on the blades, and their relation to blade geometry and loading are easily obtained. In particular, it is shown that a swept propeller with a completely subsonic leading edge can still radiate singularities, if the leading edge is blunt, due to a supersonic edge effect at the blade tips. In addition, the radiation from a family of ‘critical’ swept-blade designs is shown to be more singular than that from a straight-bladed design. Numerical and asymptotic results for such designs show that the peak radiation is, typically, increased by 5–10 dB.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 293 , 25 June 1995 , pp. 181 - 206
Copyright
© 1995 Cambridge University Press

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