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Airframe Noise Studies on Wings with Deployed High Lift Devices

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.

Full text not available from this repository.

Abstract

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)
Additional Information: LIDO-Berichtsjahr=1999,
Title:Airframe Noise Studies on Wings with Deployed High Lift Devices
Authors:
AuthorsInstitution or Email of Authors
Dobrzynski, W.UNSPECIFIED
Nagakura, K.UNSPECIFIED
Gehlhar, B.UNSPECIFIED
Buschbaum, A.UNSPECIFIED
Date:1998
Journal or Publication Title:Paper No. 98-2337 (1998)
Status:Published
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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