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Specifcation of Porous Materials for Low-Noise Trailing-Edge Applications

Herr, Michaela and Rossignol, Karl-Stéphane and Delfs, Jan Werner and Mößner, Michael and Lippitz, Nicolas (2014) Specifcation of Porous Materials for Low-Noise Trailing-Edge Applications. In: AIAA Aviation 2014 - 20th AIAA/CEAS Aeroacoustics Conference. 20th AIAA/CEAS Aeroacoustics Conference, 16.-20. Juni 2014, Atlanta, GA, USA. ISBN DOI: 10.2514/6.2014-3041.

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Official URL: http://arc.aiaa.org/doi/abs/10.2514/6.2014-3041


Systematic testing of the microstructural and aeroacoustic properties of porous metals applicable as low-noise trailing-edge (TE) treatments has been initiated within the Col- laborative Research Center SFB 880|Fundamentals of High-Lift for Future Civil Aircraft. Generic TE noise experiments were performed at Re = 0.8x10^6 to 1.2x10^6 in DLR's open-jet AWB facility. Complementary flow measurements in the closed test section MUB wind-tunnel of the TU Braunschweig served to quantify the induced aerodynamic effects. The presented database forms part of an ongoing cumulative effort, combining experimental and numerical methods, to gain a deeper understanding of the prevalent TE noise reduction mechanisms. For the large variety of porous materials tested herein a clear dependence of the achieved broadband noise reduction (reaching 2-6 dB at maximum) on the flow resistivity was identified. Basic design recommendations for material resistivity and pore sizes, the latter to minimize high-frequency self-noise contributions, were deduced for low-noise TE applications. An acoustic nearfield pressure release across the porous region, adversely coupled with a loss in lift performance for porous TE replacements, appears as the major noise-reduction requirement.

Item URL in elib:https://elib.dlr.de/91095/
Document Type:Conference or Workshop Item (Speech)
Title:Specifcation of Porous Materials for Low-Noise Trailing-Edge Applications
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Herr, Michaelamichaela.herr (at) dlr.deUNSPECIFIED
Rossignol, Karl-Stéphanekarl-stephane.rossignol (at) dlr.deUNSPECIFIED
Delfs, Jan Wernerjan.delfs (at) dlr.deUNSPECIFIED
Mößner, MichaelTU BraunschweigUNSPECIFIED
Lippitz, NicolasTU BraunschweigUNSPECIFIED
Date:June 2014
Journal or Publication Title:AIAA Aviation 2014 - 20th AIAA/CEAS Aeroacoustics Conference
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Series Name:AIAA Paper 2014-3041
ISBN:DOI: 10.2514/6.2014-3041
Keywords:Trailing-Edge Noise, Porous Materials, Aeroacoustics, Airframe Noise Reduction, Noise Reduction Technologies
Event Title:20th AIAA/CEAS Aeroacoustics Conference
Event Location:Atlanta, GA, USA
Event Type:international Conference
Event Dates:16.-20. Juni 2014
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 of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Herr, Michaela
Deposited On:16 Oct 2014 11:13
Last Modified:31 Jul 2019 19:48

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