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Acoustic Resonances in a High Lift Configuration

Hein, Stefan and Hohage, Thorsten and Koch, Werner and Schöberl, Joachim (2007) Acoustic Resonances in a High Lift Configuration. Journal of Fluid Mechanics, 582, pp. 179-202. Cambridge University Press. ISSN 0022-1120.

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Official URL: http://journals.cambridge.org/action/displayIssue?iid=1045116


Low- and high-frequency acoustic resonances are computed numerically via a high-order finite element code for a generic two-dimensional high lift configuration with a leading edge slat. Zero mean flow is assumed approximating the low Mach number situation at aircraft landing and approach. To avoid unphysical reflections at the boundaries of the truncated computational domain perfectly matched layer absorbing boundary conditions are implemented in the form of the complex scaling method of atomic and molecular physics. It is shown that two types of resonances exist: resonances of surface waves which scale with the total airfoil length and longitudinal cavity-type resonances which scale with the slat cove length. Minima exist in the temporal decay rate which can be associated with the slat cove resonances and depend on the slat cove geometry. All resonances are damped due to radiation losses. However, if coherent noise sources exist, as observed in low Reynolds number experiments, these sources can be enhanced acoustically by the above resonances if the source frequency is close to a resonant frequency.

Item URL in elib:https://elib.dlr.de/44038/
Document Type:Article
Title:Acoustic Resonances in a High Lift Configuration
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hohage, ThorstenGeorg-August-Universität GöttingenUNSPECIFIED
Schöberl, JoachimRWTH AachenUNSPECIFIED
Journal or Publication Title:Journal of Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 179-202
Publisher:Cambridge University Press
Keywords:acoustic resonances, aircraft high lift configuration, perfectly matched layer (PML), surface waves, slat cove resonances
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Hein, Dr.-Ing. Stefan
Deposited On:22 Jun 2007
Last Modified:08 Apr 2010 14:15

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