Numerical Study of Acoustic Installation Effects with a Computational Aeroacoustics Method

This paper deals with the numerical study of installation effects, a subject which comes under the more general purpose of aircraft noise prediction and reduction. As an example of installation effects, we study here the potential acoustic shield that an empennage airfoil could constitute against th...

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Bibliographic Details
Published in:AIAA journal 2010-05, Vol.48 (5), p.929-937
Main Authors: Redonnet, S, Desquesnes, G, Manoha, E, Parzani, C
Format: Article
Language:English
Subjects:
Acoustics
Aeroacoustics, atmospheric sound
Aerodynamics
Aircraft
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Noise
Noise control
Physics
Simulation
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Summary:This paper deals with the numerical study of installation effects, a subject which comes under the more general purpose of aircraft noise prediction and reduction. As an example of installation effects, we study here the potential acoustic shield that an empennage airfoil could constitute against the aft fan noise emitted by a coaxial engine. To that end, we make use of a structured computational aeroacoustics solver (sAbrinA code), taking benefits from its coupling functionality in order to handle more easily the solid obstacles that are to be accounted for. Several full-3D simulations are then conducted, which involve an exhaust installed over an empennage airfoil and allotted with two thermodynamics conditions (quiescent medium and takeoff flight). Being validated against boundary element method results, such calculations provide a validation of the numerical strategy adopted here as well as a good illustration of its abilities to solve installed engine noise problems. Coming in addition to such methodological outcomes, these calculations deliver important conceptual insights, demonstrating the potential high efficiency of empennage airfoils in terms of aft fan noise reduction. [PUBLICATION ABSTRACT]
ISSN:0001-1452
1533-385X
DOI:10.2514/1.42153