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Slat Noise Source Studies for Farfield Noise Prediction

Dobrzynski, Werner and Pott-Pollenske, Michael (2001) Slat Noise Source Studies for Farfield Noise Prediction. In: CD-Proceedings. 7th AIAA/CEAS Aeroacoustics Conference, Maastricht (nl), 28.-30.05.2001, Maastricht (NL).

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Abstract

Todays low-noise high-bypass-ratio engines have made airframe noise for large commercial aircraft in the approach configuration to be compatible to that of the engines. As a consequence, flow noise from landing gears and from high lift devices (HLD) on wings - and its control - will become ever more important. In a study, dedicated to HLD flow noise, parametric wind tunnel experiments were performed on scaled wing sections in the Aeroacoustic Wind Tunnel Braunschweig, on a complete scale model aircraft and a full scale wing-section in the German-Dutch Wind Tunnel to identify relevant airframe noise mechanisms and develop noise prediction schemes. As one essential result of these tests deployed slats were identified as prominent noise contributors. Based on an extensive set of farfield noise data and on first results from measurements of the unsteady local flow properties in the slat area the effects of flow velocity and aircraft angle of attack on slat noise radiation characteristics were determined. The test results support the assumption that slat noise originates from the upper slat trailing-edge and scales with the slat cove vortex dimension. As a consequence the transposition of slat noise data from scale model tests towards a full scale situation can approximately be based on the geometric scale factor. Based on the findings of this experimental study a simplified source model is considered for slat noise prediction.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2002,
Title:Slat Noise Source Studies for Farfield Noise Prediction
Authors:
AuthorsInstitution or Email of Authors
Dobrzynski, WernerUNSPECIFIED
Pott-Pollenske, MichaelUNSPECIFIED
Date:2001
Journal or Publication Title:CD-Proceedings
Status:Published
Keywords:airframe noise, slat noise, farfield noise prediction, model and full scale experimental work
Event Title:7th AIAA/CEAS Aeroacoustics Conference, Maastricht (nl), 28.-30.05.2001
Event Location:Maastricht (NL)
Event Type:international Conference
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:23 Nov 2005
Last Modified:14 Jan 2010 18:58

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