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Acoustic resonances in a 2D high lift configuration

Hein, Stefan and Hohage, T. and Koch, Werner and Schöberl, J. (2005) Acoustic resonances in a 2D high lift configuration. 3rd Symposium on Global Flow Instability and Control, 2005-09-27 - 2005-09-30, Crete, Greece.

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Abstract

Acoustic resonances are computed numerically for a generic two-dimensional high lift configuration. High lift devices are known to be a major source of tonal airframe noise. The computations are made for zero mean flow using a high-order finite element code in conjunction with Perfectly Matched Layer (PML) absorbing boundary conditions. Whatever the actual source of the observed discrete tones is, these tones may be enhanced by or lock onto resonant acoustic frequencies. Our computed resonant frequencies are indeed fairly close to experimentally observed low-frequency slat tones and may be interpreted as resonances of leaky surface waves. These low-frequency resonances are practically unaffected by changes in slat cove geometry contrary to high-frequency resonances.

Item URL in elib:https://elib.dlr.de/22022/
Document Type:Conference or Workshop Item (Speech)
Title:Acoustic resonances in a 2D high lift configuration
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hein, StefanUNSPECIFIEDUNSPECIFIED
Hohage, T.Universität GöttingenUNSPECIFIED
Koch, WernerUNSPECIFIEDUNSPECIFIED
Schöberl, J.Universität LinzUNSPECIFIED
Date:2005
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:acoustic resonances, high lift configuration, PML
Event Title:3rd Symposium on Global Flow Instability and Control
Event Location:Crete, Greece
Event Type:international Conference
Event Dates:2005-09-27 - 2005-09-30
Organizer:Universidad Politecnica de Madrid
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 - no assignment (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Winkels, Elisabeth
Deposited On:26 Jan 2006
Last Modified:27 Apr 2009 04:57

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