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In Search of Airworthy Trailing-Edge Noise Reduction Means

Herr, Michaela und Reichenberger, Johann (2011) In Search of Airworthy Trailing-Edge Noise Reduction Means. In: AIAA Paper 2011-2780. 17th AIAA/CEAS Aeroacoustics Conference, 2011-06-06 - 2011-06-08, Portland, Oregon, USA.

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Kurzfassung

The EC co-financed project OPENAIR aims at a further development of both innovative and established aircraft noise reduction technologies. Among these activities an innovative two-component trailing-edge (TE) design, applicable at a slat TE, was evaluated through generic tests in DLR's Acoustic Wind-Tunnel Braunschweig(AWB). The proposed design combines a supporting frame structure (a coarse metal mesh or rib structure) with a thin, hydraulically smooth cover material (a fine metal mesh, micro-perforated sheet metal or cloth material) which are both permeable to the flow. The result is a mainly hollow, flow-transparent TE region. Variants of this concept were parametrically tested versus a solid reference TE at a 0.4-m chord generic airfoil. Material selection was based on airwor- thiness considerations. Detailed flow/acoustic resistance measurements were performed to characterise the used materials. TE noise was measured by a directional microphone system. The tested TE modifications achieve a broadband noise reduction of up to 4 dB, de-pendent of the configuration. However, the noise reduction effect diminishes with growing angle-of attack. This adverse behavior as well as geometrical dependences will have to be further studied prior to large scale testing. Pressure distribution measurements reveal a non-measurable to small effect of the TE modifications on the airfoil's suction peak. Basic noise scaling laws for transposition of the results to full-scale applications are suggested.

elib-URL des Eintrags:https://elib.dlr.de/73635/
Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Zusätzliche Informationen:contact: michaela.herr@dlr.de
Titel:In Search of Airworthy Trailing-Edge Noise Reduction Means
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Herr, Michaelamichaela.herr (at) dlr.dehttps://orcid.org/0009-0000-7275-7078NICHT SPEZIFIZIERT
Reichenberger, Johannjohann.reichenberger (at) eads.netNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:Juni 2011
Erschienen in:AIAA Paper 2011-2780
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:airframe noise reduction, airworthiness, mesh material, acoustic/flow resistance
Veranstaltungstitel:17th AIAA/CEAS Aeroacoustics Conference
Veranstaltungsort:Portland, Oregon, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:6 Juni 2011
Veranstaltungsende:8 Juni 2011
Veranstalter :American Institute for Aeronautics and Astronautics, AIAA
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:L VU - Luftverkehr und Umwelt (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L VU - Luftverkehr und Umwelt
DLR - Teilgebiet (Projekt, Vorhaben):L - Leiser Luftverkehr (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Technische Akustik
Hinterlegt von: Herr, Dr. Michaela
Hinterlegt am:09 Jan 2012 13:53
Letzte Änderung:24 Apr 2024 19:39

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