Broadband noise prediction for aerofoils with a serrated trailing edge based on Amiet's theory

Gelot, Matthieu, Bernard Roger and Kim, Jae Woook (2021) Broadband noise prediction for aerofoils with a serrated trailing edge based on Amiet's theory. Journal of Sound and Vibration, 512, [116352]. (doi:10.1016/j.jsv.2021.116352).

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Abstract

Trailing-edge serrations are used as means to reduce aerofoil broadband self-noise in various industrial applications. However, a reliable prediction of the reduced noise level has not been established to date. In this paper, the authors suggest that Amiet's theory can be used to accurately predict the sound radiated from serrated trailing edges. A plausible explanation as to how the classical theory, originally derived from non-serrated (straight) trailing edges, also works for the serrated trailing edges is provided. Besides, the authors propose a directivity correction to the Amiet's original model to account for realistic aerofoil geometry. The directivity correction provides a significantly improved prediction of the noise level in the upstream and downstream directions for both serrated and baseline trailing edge cases. This study is based on wall-resolved large-eddy simulations of Joukowski aerofoils with multiple serration geometries and in different flow conditions.

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Gelot, Kim - 2021 - Broadband noise prediction for aerofoils with a serrated trailing edge based on Amiet’s theory

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Accepted/In Press date: 8 July 2021

Published date: 10 November 2021

Additional Information: Funding Information: The authors would like to thank VESTAS for this project with special acknowledgement to Mr Diogo Samora Cerqueira and Mr Tomas Vronsky. We also acknowledge EPSRC (Engineering and Physical Sciences Research Council) for the UK supercomputing facility ARCHER made available for this work via UK Turbulence Consortium (EP/R029326/1). Besides, we would like to acknowledge the high-performance computing facility IRIDIS 5 and associated support services at the University of Southampton in the completion of this research. All data supporting this study are openly available from the University of Southampton repository at https://doi.org/10.5258/SOTON/D1890. Funding Information: The authors would like to thank VESTAS for this project with special acknowledgement to Mr Diogo Samora Cerqueira and Mr Tomas Vronsky. We also acknowledge EPSRC (Engineering and Physical Sciences Research Council) for the UK supercomputing facility ARCHER made available for this work via UK Turbulence Consortium (EP/R029326/1). Besides, we would like to acknowledge the high-performance computing facility IRIDIS 5 and associated support services at the University of Southampton in the completion of this research. All data supporting this study are openly available from the University of Southampton repository at https://doi.org/10.5258/SOTON/D1890 . Publisher Copyright: © 2021 Elsevier Ltd Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

Keywords: Computational aeroacoustics, Trailing-edge noise