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The influence of realistic 3D viscous mean flow on shielding of engine-fan noise by a 3-element high-lift wing

Dierke, Jürgen and Ewert, Roland and Chappuis, Johanna and Lidoine, Stéphane and Ricouard, Julien (2010) The influence of realistic 3D viscous mean flow on shielding of engine-fan noise by a 3-element high-lift wing. 16th AIAA/CEAS Aeroacoustics Conference, 7.-9. Jun. 2010, Stockholm, Schweden.



The prediction of aeroacoustic shielding often rests on tools using constant mean flow thus neglecting mean flow inhomogeneities such as shear layers. This study analyses the influence of this simplification on shielding. As an example we considered engine-fan noise shielding at a 3-element high-lift wing. A Computational Aeroacoustic (CAA) approach was chosen. The simulations were carried out with the DLR CAA code PIANO. PIANO solves the Linearized Euler Equations (LEE) over steady viscous mean flow. To determine the mean flow influence three sets were computed. One rests on a realistic viscous Reynolds Averaged Navier-Stokes (RANS) solution, the second makes use of a simple constant mean flow and the third uses constant mean flow in conjunction with a flat plate with the same chord length to replace the wing. An axisymmetric solution of the finite element simulation code ACTRAN predicted the fan sound propagation from the engine intake through the non-uniform flow to a cylindrical interface. Subsequently, the data was coupled to the CAA computational domain via a Thompson boundary condition. It is shown that this condition meets the coupling requirements well. This study shows that the viscous mean flow has a significant influence on the predicted shielding potential of a high-lift wing. That is, the shielding benefit of a simplified prediction based on uniform flow propagation and a simplified geometrical significantly overestimate the potential shielding benefits considerably.

Item URL in elib:https://elib.dlr.de/64376/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:The influence of realistic 3D viscous mean flow on shielding of engine-fan noise by a 3-element high-lift wing
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Dierke, Jürgenjuergen.dierke (at) dlr.deUNSPECIFIED
Ewert, Rolandroland.ewert (at) dlr.deUNSPECIFIED
Chappuis, JohannaAirbusUNSPECIFIED
Lidoine, StéphaneAirbusUNSPECIFIED
Ricouard, JulienAirbusUNSPECIFIED
Date:June 2010
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:CAA. Aeroacoustic, Aeroakustik, Abschattung, Triebwerkslärm, Shielding, Strömung, viscous mean flow
Event Title:16th AIAA/CEAS Aeroacoustics Conference
Event Location:Stockholm, Schweden
Event Type:international Conference
Event Dates:7.-9. Jun. 2010
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Dierke, Jürgen
Deposited On:21 Jun 2010 08:26
Last Modified:31 Jul 2019 19:27

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