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Aeroacoustic design of aero-engine intake liners

Aeroacoustic design of aero-engine intake liners
Aeroacoustic design of aero-engine intake liners
Fan noise transmission through and radiation from realistic lined intakes is computed via the GFD method. The high accuracy of this wave-based discretization method and the use of an ”exact” radiation condition supplied by an integral formulation enable genuine 3D simulations at fan-radius Helmholtz numbers up to 22, within practical times on single processor platforms. Helmholtz numbers of 50 can be achieved on a 10-CPUs parallel platform within equivalent computational times. Both axisymmetric and negatively scarfed configurations are considered. For the scarfed case, the effect of axial and circumferential segmentations of the acoustic treatment on the sound radiation is explored at a given frequency and spinning mode order. It is shown that the presence of rigid splices reduces the attenuation effect of the acoustic treatment. Futhermore, the effect of the scarf angle on the upward/downward peak-levels observed for a rigid-wall configuration is no more evident when a segmented liner is considered.
1-14
Di Francescantonio, Paolo
d8a1ae53-0fd8-49fe-9b51-9da7c49689f6
Casalino, Damiano
b9dde36a-56c2-42de-b2bb-391ee65e003a
De Mercato, Luigi
9e1a5624-c0c2-4a17-9f03-96c58719a161
Di Francescantonio, Paolo
d8a1ae53-0fd8-49fe-9b51-9da7c49689f6
Casalino, Damiano
b9dde36a-56c2-42de-b2bb-391ee65e003a
De Mercato, Luigi
9e1a5624-c0c2-4a17-9f03-96c58719a161

Di Francescantonio, Paolo, Casalino, Damiano and De Mercato, Luigi (2005) Aeroacoustic design of aero-engine intake liners. 11th AIAA/CEAS Aeroacoustics Conference. 23 - 25 May 2005. pp. 1-14 .

Record type: Conference or Workshop Item (Paper)

Abstract

Fan noise transmission through and radiation from realistic lined intakes is computed via the GFD method. The high accuracy of this wave-based discretization method and the use of an ”exact” radiation condition supplied by an integral formulation enable genuine 3D simulations at fan-radius Helmholtz numbers up to 22, within practical times on single processor platforms. Helmholtz numbers of 50 can be achieved on a 10-CPUs parallel platform within equivalent computational times. Both axisymmetric and negatively scarfed configurations are considered. For the scarfed case, the effect of axial and circumferential segmentations of the acoustic treatment on the sound radiation is explored at a given frequency and spinning mode order. It is shown that the presence of rigid splices reduces the attenuation effect of the acoustic treatment. Futhermore, the effect of the scarf angle on the upward/downward peak-levels observed for a rigid-wall configuration is no more evident when a segmented liner is considered.

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More information

Published date: 2005
Venue - Dates: 11th AIAA/CEAS Aeroacoustics Conference, 2005-05-23 - 2005-05-25
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Local EPrints ID: 28534
URI: https://eprints.soton.ac.uk/id/eprint/28534
PURE UUID: ef546218-80b0-4cc7-ac62-8abd41677e92

Catalogue record

Date deposited: 02 May 2006
Last modified: 15 Jul 2019 19:10

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