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Delfs, Jan Werner 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. 107-127. Elsevier. doi: 10.1016/j.jsv.2015.07.005. ISSN 0022-460X.
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Official URL: https://doi.org/10.1016/j.jsv.2015.07.005
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/ | ||||||||||||||||||||
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| Document Type: | Article | ||||||||||||||||||||
| Title: | Mechanisms of trailing edge noise reduction by means of micro slots or porosity | ||||||||||||||||||||
| Authors: |
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| Date: | 24 November 2015 | ||||||||||||||||||||
| Journal or Publication Title: | Journal of Sound and Vibration | ||||||||||||||||||||
| Refereed publication: | Yes | ||||||||||||||||||||
| Open Access: | No | ||||||||||||||||||||
| Gold Open Access: | No | ||||||||||||||||||||
| In SCOPUS: | Yes | ||||||||||||||||||||
| In ISI Web of Science: | Yes | ||||||||||||||||||||
| Volume: | 357 | ||||||||||||||||||||
| DOI: | 10.1016/j.jsv.2015.07.005 | ||||||||||||||||||||
| Page Range: | pp. 107-127 | ||||||||||||||||||||
| Editors: |
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| 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 (old), 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: | 01 Jun 2026 11:11 |
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