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Numerical investigation of porous materials für trailing edge noise reduction

Rossian, Lennart and Delfs, Jan Werner and Ewert, Roland (2020) Numerical investigation of porous materials für trailing edge noise reduction. International Journal of Aeroacoustics, Vol. 1 (19), pp. 347-364. Sage Publications. doi: 10.1177/1475472X20954410. ISSN 1475-472X.

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Official URL: http://journals.sagepub.com/home/jae

Abstract

In the framework of the German Collaborative Research Center CRC 880: Fundamentals of High Lift for Future Civil Aircraft porous materials as a means towards the reduction of airfoil trailing edge noise are investigated. At DLR, both experimental and numerical approaches are pursued to understand the physics behind the noise reduction. The present paper focuses on the numerical investigations, for which the experimental data serves as an evaluation basis. From the analysis of homogeneous materials, first steps are made towards the design of aeroacoustically tailored materials. It is assumed that materials with locally varying permeability may be suitable to achieve maximum noise reduction, as they provide a smooth transition from the solid airfoil to the free flow in the wake. The simulation results support this understanding, however it is revealed that high local gradients in the material properties themselves may act as acoustic sources.

Item URL in elib:https://elib.dlr.de/139638/
Document Type:Article
Title:Numerical investigation of porous materials für trailing edge noise reduction
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rossian, LennartLennart.Rossian (at) dlr.deUNSPECIFIED
Delfs, Jan WernerJan.Delfs (at) dlr.deUNSPECIFIED
Ewert, RolandRoland.Ewert (at) dlr.deUNSPECIFIED
Date:2020
Journal or Publication Title:International Journal of Aeroacoustics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Vol. 1
DOI :10.1177/1475472X20954410
Page Range:pp. 347-364
Publisher:Sage Publications
ISSN:1475-472X
Status:Published
Keywords:trailing edge noise, porous materials, computational aeroacoustics, tailored materials, validation
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 - Simulation and Validation (old)
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Stebner, Margrit Elisabeth
Deposited On:07 Jan 2021 14:01
Last Modified:07 Jan 2021 14:01

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