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CAA methodology to simulate turbulence-airfoil noise

CAA methodology to simulate turbulence-airfoil noise
CAA methodology to simulate turbulence-airfoil noise
Turbulent wakes generated by turbofan blades and interacting with the outlet guide vanes are known to be mainly contributing to broadband noise emission of aero-engines at approach conditions. Analytical approaches, such as the well-known Amiet model can be adopted to estimate the noise generated by turbulent flows impinging thin airfoils, but they are limited by the flat-plate assumptions. The development of numerical methods allowing to consider more complex geometries and realistic flows is required. The method described in the present paper, is based on a CAA code solving the nonlinear Euler equations. The upstream turbulence is synthesized from a stochastic model and injected into the computational domain through an adapted boundary condition. It is first validated in 2D and 3D against academic flat plate configurations by comparison with Amiet solutions (exact in such cases). Then, 3D computations are applied to simulate the effect of a passive treatment (leading edge serrations) aiming at reducing turbulence interaction noise of an isolated airfoil studied in the framework of European project FLOCON. First calculations on baseline conditions are shown to be able to reproduce the measured spectra and far-field directivities, and the acoustic performances of the serrations (3-4 dB PWL reduction) are fairly well assessed too
Clair, V.
4fc28cab-f835-4f4e-a50d-0040865da0ff
Polacsek, C.
20a2423a-93a0-414f-ae65-1328a75af49f
Le Garrec, T.
a2b52c1f-add1-4c19-824c-ec223cba8471
Reboul, G.
5a5fc3fd-6560-4e67-9b3f-fa4ae2af39d0
Clair, V.
4fc28cab-f835-4f4e-a50d-0040865da0ff
Polacsek, C.
20a2423a-93a0-414f-ae65-1328a75af49f
Le Garrec, T.
a2b52c1f-add1-4c19-824c-ec223cba8471
Reboul, G.
5a5fc3fd-6560-4e67-9b3f-fa4ae2af39d0

Clair, V., Polacsek, C., Le Garrec, T. and Reboul, G. (2012) CAA methodology to simulate turbulence-airfoil noise. 18th AIAA/CEAS Aeroacoustics Conference, United States. 04 - 06 Jun 2012. (doi:10.2514/6.2012-2189).

Record type: Conference or Workshop Item (Paper)

Abstract

Turbulent wakes generated by turbofan blades and interacting with the outlet guide vanes are known to be mainly contributing to broadband noise emission of aero-engines at approach conditions. Analytical approaches, such as the well-known Amiet model can be adopted to estimate the noise generated by turbulent flows impinging thin airfoils, but they are limited by the flat-plate assumptions. The development of numerical methods allowing to consider more complex geometries and realistic flows is required. The method described in the present paper, is based on a CAA code solving the nonlinear Euler equations. The upstream turbulence is synthesized from a stochastic model and injected into the computational domain through an adapted boundary condition. It is first validated in 2D and 3D against academic flat plate configurations by comparison with Amiet solutions (exact in such cases). Then, 3D computations are applied to simulate the effect of a passive treatment (leading edge serrations) aiming at reducing turbulence interaction noise of an isolated airfoil studied in the framework of European project FLOCON. First calculations on baseline conditions are shown to be able to reproduce the measured spectra and far-field directivities, and the acoustic performances of the serrations (3-4 dB PWL reduction) are fairly well assessed too

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More information

Published date: June 2012
Venue - Dates: 18th AIAA/CEAS Aeroacoustics Conference, United States, 2012-06-04 - 2012-06-06
Organisations: Acoustics Group

Identifiers

Local EPrints ID: 372215
URI: https://eprints.soton.ac.uk/id/eprint/372215
PURE UUID: a0c64a67-4e87-481c-b179-9ec6aec86e2a

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Date deposited: 08 Dec 2014 09:17
Last modified: 15 Jul 2019 21:37

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