elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Design Criteria for Low-Noise Trailing-Edges

Herr, Michaela (2007) Design Criteria for Low-Noise Trailing-Edges. In: AIAA Paper 2007-3470. 13th AIAA/CEAS Aeroacoustics Conference, 2007-05-21 - 2007-05-23, Rome, Italy.

[img] PDF - Registered users only
970kB

Official URL: http://www.aiaa.org

Abstract

This paper summarizes the results of an experimental study on flow-permeable trailing-edge noise reduction means. Basic design rules are presented with respect to a future employment at current high-lift devices of passenger aircraft. The main focus is directed at the identification of the major design parameters of comb-type or slit edge-modifications. The achievable noise reduction capability was quantified by directional microphone measurements on a flat plate and on a two-dimensional NACA0012-like airfoil in the open-jet Aeroacoustic Wind Tunnel Braunschweig. It was found that flexibility of the comb material is beneficial, but not essential to achieve a noise reduction. Apart from a minimum device length the slit width was identified as the decisive design parameter. An almost zero-spacing of the comb fibers revealed the best results, leading to the assumption that the obtained noise reduction is mainly due to a viscous damping of turbulent flow pressure amplitudes in the comb area.

Item URL in elib:https://elib.dlr.de/48603/
Document Type:Conference or Workshop Item (Paper)
Additional Information:Online Proceedings
Title:Design Criteria for Low-Noise Trailing-Edges
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Herr, MichaelaUNSPECIFIEDUNSPECIFIED
Date:May 2007
Journal or Publication Title:AIAA Paper 2007-3470
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Trailing-Edge Noise, Noise Reduction, Trailing-Edge Brushes, Comb-Type Trailing-Edges, Slit Trailing-Edges. Flow-Permeable Edge-Modifications, Elliptic Mirror, Directional Microphone Measurements, Airframe Noise
Event Title:13th AIAA/CEAS Aeroacoustics Conference
Event Location:Rome, Italy
Event Type:international Conference
Event Dates:2007-05-21 - 2007-05-23
Organizer:AIAA/CEAS
HGF - Research field:Aeronautics, Space and Transport
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: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Herr, Michaela
Deposited On:07 Jun 2007
Last Modified:12 Dec 2013 20:24

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.