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Computational aeroacoustic simulations of leading-edge slat flow

Computational aeroacoustic simulations of leading-edge slat flow
Computational aeroacoustic simulations of leading-edge slat flow
High-lift devices on modern airliners are a major contributor to overall airframe noise. In this paper the aeroacoustics of leading-edge slat devices in a high-lift configuration are investigated computationally. A hierarchical methodology is used to enable the rapid evaluation of different slat configurations. The overall goal is to gain a deeper understanding of the noise generation and amplification mechanisms in and around the slat, and the effects of slat system geometry.
In order to perform parametric studies of the aeroacoustics, a simplified 2-D model of the slat is used. The flow and aeroacoustics are computed using a compressible, unsteady, Reynolds-Averaged Navier-Stokes code. A robust buffer zone boundary condition is used to prevent the reflection of outgoing acoustic waves from contaminating the long-time solution. A Ffowcs Williams–Hawkings solver is used to compute the far field acoustic field from the unsteady flow solution and determine the directivity. The spanwise correlation length used is derived from experimental data of this high-lift configuration. The effect of spanwise correlation length on the acoustic far field is examined.
The aeroacoustics of the slat system are largely governed by the geometry, especially in terms of slat overlap. We perform a study of the effects of trailing edge thickness, horizontal and vertical overlap settings for the slat on near field wave propagation and far field directivity. The implications for low-noise leading edge slat design are discussed.
0022-460X
559-572
Takeda, K.
e699e097-4ba9-42bd-8298-a2199e71d061
Zhang, X.
3056a795-80f7-4bbd-9c75-ecbc93085421
Nelson, P.A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Takeda, K.
e699e097-4ba9-42bd-8298-a2199e71d061
Zhang, X.
3056a795-80f7-4bbd-9c75-ecbc93085421
Nelson, P.A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9

Takeda, K., Zhang, X. and Nelson, P.A. (2004) Computational aeroacoustic simulations of leading-edge slat flow. Journal of Sound and Vibration, 270 (3), 559-572. (doi:10.1016/j.jsv.2003.09.046).

Record type: Article

Abstract

High-lift devices on modern airliners are a major contributor to overall airframe noise. In this paper the aeroacoustics of leading-edge slat devices in a high-lift configuration are investigated computationally. A hierarchical methodology is used to enable the rapid evaluation of different slat configurations. The overall goal is to gain a deeper understanding of the noise generation and amplification mechanisms in and around the slat, and the effects of slat system geometry.
In order to perform parametric studies of the aeroacoustics, a simplified 2-D model of the slat is used. The flow and aeroacoustics are computed using a compressible, unsteady, Reynolds-Averaged Navier-Stokes code. A robust buffer zone boundary condition is used to prevent the reflection of outgoing acoustic waves from contaminating the long-time solution. A Ffowcs Williams–Hawkings solver is used to compute the far field acoustic field from the unsteady flow solution and determine the directivity. The spanwise correlation length used is derived from experimental data of this high-lift configuration. The effect of spanwise correlation length on the acoustic far field is examined.
The aeroacoustics of the slat system are largely governed by the geometry, especially in terms of slat overlap. We perform a study of the effects of trailing edge thickness, horizontal and vertical overlap settings for the slat on near field wave propagation and far field directivity. The implications for low-noise leading edge slat design are discussed.

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More information

Published date: 2004
Additional Information: I.M.A. Conference on Computational Aeroacoustics, London, UK, Apr 2002

Identifiers

Local EPrints ID: 22289
URI: http://eprints.soton.ac.uk/id/eprint/22289
ISSN: 0022-460X
PURE UUID: 22ebfa95-12ee-43d6-8957-3c2fabedb005
ORCID for P.A. Nelson: ORCID iD orcid.org/0000-0002-9563-3235

Catalogue record

Date deposited: 15 Mar 2006
Last modified: 16 Mar 2024 02:32

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Contributors

Author: K. Takeda
Author: X. Zhang
Author: P.A. Nelson ORCID iD

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