Dobrzynski, W. and Nagakura, K. and Gehlhar, B. and Buschbaum, A. (1998) Airframe Noise Studies on Wings with Deployed High Lift Devices. In: Paper No. 98-2337 (1998). 4th AIAA/CEAS Aeroacoustic Conference, Toulouse (fr), 02.-04.06.1998.
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Employment of very quiet high-bypass-ratio engines to propel current and future "very large aircraft" has caused airframe noise to become a significant contributor to the overall radiated noise from an aircraft in landing approach. To understand the noise generation from aircraft components deployed during the final approach leg, such as landing gears and high-lift devices (HLD) on wings a German National Research Project was initiated, culminating in a series of model- and full-scale wind tunnel experiments on HLD. Initial results from HLD-studies in the DLR Aeroacoustics Wind Tunnel Braunschweig (AWB) are discussed where an acoustic mirror was employed on a 1/10 scale-model wing section to identify the aeroacoustic source mechanisms of slat-noise and flap side-edge noise. Tests were performed for different flow velocities and wing angles-of attack, indicating that the very slat tracks constitute sources of excessive flow noise. Moreover, both slat-noise and flap side-edge noise, respectively, were found to each be a result of specific combinations of different unsteady-aerodynamics mechanisms. Several, though still perliminars noise reduction techniques were tested.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||Airframe Noise Studies on Wings with Deployed High Lift Devices|
|Journal or Publication Title:||Paper No. 98-2337 (1998)|
|Keywords:||Airframe Noise, High Lift Devices|
|Event Title:||4th AIAA/CEAS Aeroacoustic Conference, Toulouse (fr), 02.-04.06.1998|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|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:||Köln-Porz , Braunschweig , Göttingen|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik|
|Deposited By:||Claudia Grant|
|Deposited On:||16 Sep 2005|
|Last Modified:||14 Jan 2010 20:03|
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