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The influence of an adaptive nacelle inlet lip on fan noise propagation
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-2910-3770
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0002-9061-4174
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-0176-5358
2016 (English)In: Proceedings of Meetings on Acoustics, ISSN 1939-800X, Vol. 28, no 1, 030004Article in journal (Refereed) Published
Abstract [en]

The aeroacoustic performance of an adaptive inlet of a turbo-fan engine is numerically investigated. The sound intensity and directivity of fan noise propagation to the far-field, and the sound level at lateral reference points are investigated. The investigation is performed for three Helmholtz numbers, with the influence of the mean flow, for a single duct mode. A finite element solver for Helmholtz equation is used in the inner part of the inlet, with a perfectly matched layer boundary condition close to the inlet entrance. The propagation through the outer part of domain is solved by Kirchhoff integral method. The results show the influence of the inlet shape adaptation on the noise intensity level as well as the directivity of propagation. The maximum peak intensity level of all inlet shapes is increased by increasing the Helmholtz number. This causes the width of intensity distribution to become narrower and shifted towards the symmetry axis of the nacelle. The inlet shape with the most opened nacelle throat has the lowest peak and an intensity distribution shifted towards the symmetry axis, which indicates the influence of the mean flow. Also, the more closed nacelle throat causes a decrease of the effective perceived noise level. 

Place, publisher, year, edition, pages
Acoustical Society of America (ASA), 2016. Vol. 28, no 1, 030004
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-197680DOI: 10.1121/2.0000462OAI: oai:DiVA.org:kth-197680DiVA: diva2:1052741
Note

QC 20170803

Available from: 2016-12-07 Created: 2016-12-07 Last updated: 2017-08-03Bibliographically approved

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Majić, FraneEfraimsson, GunillaO'Reilly, Ciarán J.
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