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An analytically-based method for predicting the noise generated by the interaction between turbulence and a serrated leading edge

Accepted version
Peer-reviewed

Type

Article

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Authors

Mathews, JR 

Abstract

This paper considers the interaction of turbulence with a serrated leading edge. We investigate the noise produced by an aerofoil moving through a turbulent perturbation to uniform flow by considering the scattered pressure from the leading edge. We model the aerofoil as an infinite half plane with a leading edge serration, and develop an analytical model using a Green’s function based upon the work of Howe. This allows us to consider both deterministic eddies and synthetic turbulence interacting with the leading edge. We show that it is possible to reduce the noise by using a serrated leading edge compared with a straight edge, but the optimal noise-reducing choice of serration is hard to predict due to the complex interaction. We also consider the effect of angle of attack, and find that in general the serrations are less effective at higher angles of attack.

Description

Keywords

Leading edge serration, Synthetic turbulence, Eddies, Green's function

Journal Title

Journal of Sound and Vibration

Conference Name

Journal ISSN

0022-460X
1095-8568

Volume Title

422

Publisher

Elsevier BV
Sponsorship
Engineering and Physical Sciences Research Council (EP/H023348/1)