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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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.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Acoustic resonances in a 2D high lift configuration|
|In ISI Web of Science:||No|
|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|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L -- no assignement|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Helicopters|
|Deposited By:||Elisabeth Winkels|
|Deposited On:||26 Jan 2006|
|Last Modified:||27 Apr 2009 04:57|
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