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Assessment of slat and flap side-edge noise reduction potential from far field noise measurements

Dobrzynski, W. (2003) Assessment of slat and flap side-edge noise reduction potential from far field noise measurements. DLR-Interner Bericht. 124-2003/40, 163 S.

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Abstract

Within Task 1.6.3.2 new high lift devices were noise tested in DNW-LLF's open test section at a 1/10.6 scaled A340 model, aiming at an optimization of selected devices and the quantification of their respective noise potentials. From the test results the model slat-tracks were identified as the major sources of aerodynamic noise. Ad-hoc fairings, when added to the tracks, provided some noise reduction. However, in contrast to the expected results, still no significant noise reduction could be demonstrated through "low noise" modifications of the slat trailing-edges. Some noise reduction was observed for porous treatments of the slat-horn and the flap side-edges as well as through seals applied to the slat-pylon junction gaps. As a consequence a description of the slat and flap side-edge noise source characteristics with respect to flight conditions could be performed as planned.

Document Type:Monograph (DLR-Interner Bericht)
Additional Information: LIDO-Berichtsjahr=2004,
Title:Assessment of slat and flap side-edge noise reduction potential from far field noise measurements
Authors:
AuthorsInstitution or Email of Authors
Dobrzynski, W.UNSPECIFIED
Date:2003
Number of Pages:163
Status:Published
Keywords:Airframe noise, slat-noise, flap-edge noise
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
Deposited By: Claudia Grant
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 19:27

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