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Mechanisms of trailing edge noise reduction by means of micro slots or porosity

Delfs, Jan and Faßmann, Benjamin and Herr, Michaela and Mößner, Michael (2015) Mechanisms of trailing edge noise reduction by means of micro slots or porosity. Journal of Sound and Vibration (357), pp. 108-109. Elsevier. DOI: 10.1016/j.jsv.2015.07.005 ISSN 0022-460X

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Official URL: http://www.elsevier.com/locate/jsvi

Abstract

Trailing edge noise reduction by means of replacing the rear 11 percent of the chord c of an airfoil with porous material was investigated experimentally and numerically. As simple porosity streamwise oriented micro slots were studied, periodic along the span. The vorticity of any pertubation vortex in the boundary layer induces flow around the edge. For the solid edge the perturbation flow strictly points away from the edge, representing sound while for the slotted edge, the flow is sucked through the slot back into the vortex system, i.e. does not represent sound. Measurements show noise reduction for slots and various porous materials in quantitative agreement with the computations. Apparently the mechanism is not driven, but only modified by viscosity.

Item URL in elib:https://elib.dlr.de/102500/
Document Type:Article
Title:Mechanisms of trailing edge noise reduction by means of micro slots or porosity
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Delfs, Janjan.delfs (at) dlr.deUNSPECIFIED
Faßmann, Benjaminbenjamin.fassmann (at) dlr.deUNSPECIFIED
Herr, Michaelamichaela.herr (at) dlr.deUNSPECIFIED
Mößner, Michaelmichael.moessner (at) dlr.deUNSPECIFIED
Date:24 November 2015
Journal or Publication Title:Journal of Sound and Vibration
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.jsv.2015.07.005
Page Range:pp. 108-109
Editors:
EditorsEmail
Detandt, IvesUNSPECIFIED
Publisher:Elsevier
Series Name:Aeroacoustics research in Europe: The CEAS-ASC report on 2014 highlights
ISSN:0022-460X
Status:Published
Keywords:aeroacoustics, aeroakustik, trailing edge noise, Hinterkantengeräusch, reduction of noise, Schallminderung, porous material, poröse Materialien
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, E - Wind Energy (old)
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Delfs, Prof.Dr. Jan Werner
Deposited On:07 Jan 2019 16:13
Last Modified:31 Jul 2019 19:59

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