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Large-Scale Studies on Slat Noise Reduction

Herr, Michaela and Pott-Pollenske, Michael and Ewert, Roland and Boenke, Dirk and Siebert, Jona and Delfs, Jan and Rudenko, Anton and Büscher, Alexander and Friedel, Hendrik and Mariotti, Irene (2015) Large-Scale Studies on Slat Noise Reduction. In: AIAA Aviation, 21st AIAA/CEAS Aeroacoustics Conference (3140), pp. 1-23. 21st AIAA/CEAS Aeroacoustics Conference, 22.-26. Juni 2015, Dallas, TX, USA. DOI: 10.2514/6.2015-3140

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Official URL: http://arc.aiaa.org

Abstract

Slat noise research activity within the EC co-financed project OPENAIR involved both experimental and numerical studies at the new large (1:3.3-scaled) swept high-lift wing model F15LS. Experiments were performed in the DNW-LLF (Large Low-speed Facility) to verify the noise reduction benefit of selected slat noise reduction concepts under more realistic test conditions than in precursor projects. Moreover, the gained test data served to extend current slat noise validation datasets towards larger Reynolds numbers, i.e. up to Re = 5.1 Mio. in the current experiment. Slat noise reduction concepts under review were 1) slat gap/overlap setting variations, and 2) an adaptive slat with the potential to reduce the gap width for noise reduction. Both concepts were proven highly e�fficient: Sealing of the gap leads to a maximum 5-dB noise reduction at wing level, equivalent to a full elimination of the slat noise source. Optimized slat settings or an adaptive slat with partially closed gap are suited to reduce slat noise by about 2-3 dB at wing level while producing negligible aerodynamic impact at the operative test angles of attack within the linear polar region. When transposing these results to overall aircraft flight conditions, optimized slat settings might bring about a 0.5-EPNdB reduction of approach certification noise levels, provided all other relevant noise sources than the slat remain untreated. CAA (Computational Aeroacoustics) prediction results derived with DLR's PIANO and DISCO codes coupled with RANS-based stochastic source models revealed a generally good reproduction of the measured trends.

Item URL in elib:https://elib.dlr.de/97534/
Document Type:Conference or Workshop Item (Speech)
Title:Large-Scale Studies on Slat Noise Reduction
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Herr, Michaelamichaela.herr (at) dlr.deUNSPECIFIED
Pott-Pollenske, Michaelmichael.pott-pollenske (at) dlr.deUNSPECIFIED
Ewert, Rolandroland.ewert (at) dlr.deUNSPECIFIED
Boenke, Dirkdirk.boenke (at) dlr.deUNSPECIFIED
Siebert, Jonajona.siebert (at) dlr.deUNSPECIFIED
Delfs, Janjan.delfs (at) dlr.deUNSPECIFIED
Rudenko, Antonanton.rudenko (at) dlr.deUNSPECIFIED
Büscher, AlexanderAirbus OperationsUNSPECIFIED
Friedel, Hendrikhendrik.friedel (at) airbus.comUNSPECIFIED
Mariotti, IreneAirbus FranceUNSPECIFIED
Date:June 2015
Journal or Publication Title:AIAA Aviation, 21st AIAA/CEAS Aeroacoustics Conference
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2015-3140
Page Range:pp. 1-23
Series Name:AIAA Paper 2015-
Status:Published
Keywords:slat noise reduction, OPENAIR, CAA validation, adaptive slat, slat settings, F15LS, DNW-LLF
Event Title:21st AIAA/CEAS Aeroacoustics Conference
Event Location:Dallas, TX, USA
Event Type:international Conference
Event Dates:22.-26. Juni 2015
Organizer:American Institute of Aeronautics and Astronautics
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
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Herr, Michaela
Deposited On:27 Jul 2015 10:07
Last Modified:31 Jul 2019 19:54

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