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Experimental investigation of porous materials for trailing-edge noise reduction

Rossignol, Karl-Stephane and Suryadi, Alexandre and Herr, Michaela and Schmidt, Johannes and Tychson, Jörn (2020) Experimental investigation of porous materials for trailing-edge noise reduction. International Journal of Aeroacoustics (19), pp. 365-384. Sage Publications. doi: 10.1177/1475472X20954421. ISSN 1475-472X.

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Official URL: https://doi.org/10.1177/1475472X20954421.


The introduction of quiet short take-off and landing for civil aircraft operations in close proximity to the population poses important technological challenges. One critical aspect is the realization of extreme lift augmentation at low acoustic emissions. The aircraft concept selected to achieve this goal is a high-lift system equipped with an active flow-control non-slotted flap and a droop nose. For this specific configuration, trailing edge noise becomes a dominant noise source. Porous materials as a passive means for trailing-edge noise reduction are selected and characterized. Results of extensive experimental investigations in the acoustic wind tunnel Braunschweig are presented and discussed to point out the potential and limitations of the selected porous devices. Practical issues related to material manufacturing and integration into the wind tunnel model are addressed. The noise reduction potential of passive porous trailing-edge devices is found to strongly depend on both these aspects. Issues related to the characterization of the porous materials properties are described. Although porous materials are found to be successful at reducing trailing-edge noise emissions, the results indicate that there is still a need for more generic investigations to further clarify the parametric dependencies between noise reduction and material properties.

Item URL in elib:https://elib.dlr.de/137693/
Document Type:Article
Title:Experimental investigation of porous materials for trailing-edge noise reduction
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Suryadi, AlexandreUNSPECIFIEDhttps://orcid.org/0000-0002-5129-5510UNSPECIFIED
Date:1 September 2020
Journal or Publication Title:International Journal of Aeroacoustics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 365-384
Publisher:Sage Publications
Keywords:Trailing-edge noise, porous materials, noise reduction, airframe noise, high-lift system, Coanda effect
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology
Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Rossignol, Karl-Stephane
Deposited On:19 Nov 2020 07:53
Last Modified:24 Oct 2023 14:29

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