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Noise reduction potential of flow permeable materials for jet-flap interaction noise

Jente, Christian und Schmidt, Johannes und Delfs, Jan Werner und Rossignol, Karl-Stephane und Pott-Pollenske, Michael und Siller, Henri (2022) Noise reduction potential of flow permeable materials for jet-flap interaction noise. In: 28th AIAA/CEAS Aeroacoustics Conference, 2022, Seiten 1-18. 28th AIAA/CEAS Aeroacoustics Conference, 2022-06-14 - 2022-06-17, Southampton, UK. doi: 10.2514/6.2022-3040. ISBN 978-162410664-4.

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Offizielle URL: https://doi.org/10.2514/6.2022-3040

Kurzfassung

Jet-flap interaction (JFI) noise plays a particularly important role during take-offs and landings, i.e. when the aircraft is in the immediate vicinity of inhabited areas. The interaction of the jet with the deployed flaps causes a substantial increase of low-frequent aircraft noise. Noise reduction technologies (NRTs) were studied for their potential to diminish the JFI effect: The wing was equipped with various permeable or porous (flap) trailing edges which cover the last 10% of the clean chord length. The first test was conducted at the Aeroacoustic Wind tunnel in Braunschweig (AWB) on a cruise wing model, i.e. the engine was not installed. Beneath the testing of various materials and concepts, a design parameter study was conducted about the minimally needed treated chord length. The four most promising materials were down-selected for an installed engine test at the jet noise test facility JExTRA in Berlin: Two NRTs are designed as hollow flaps: perforated or slotted metal sheets are fixed onto a rib structure. The other two NRTs are porous materials (fine/coarse size). The tests were conducted for static operations between Mj=0.45 and 0.75. The engine integration was mainly defined by a height of H=0.6Dj (close integration) and a length of L=2Dj. Remarkable noise reduction was measured especially for low jet Mach numbers and up to Mj=0.7. At high Mach number, some NRTs produce tones which follow a Helmholtz analogy. The only tested NRT which is immune to this, uses a cover mesh which introduces another trailing edge. The tests with flow permable flap trailing edges show the great potential of reducing jet-flap interaction noise. Open questions regard (1) the deepening of the physical understanding of noise reduction mechanisms, (2) a proof of performance under flight conditions and (3) a design optimization which balances a small aerodynamic lift penalty vs. the acoustic benefit.

elib-URL des Eintrags:https://elib.dlr.de/186938/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Noise reduction potential of flow permeable materials for jet-flap interaction noise
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Jente, ChristianChristian.Jente (at) dlr.dehttps://orcid.org/0000-0001-6115-3084NICHT SPEZIFIZIERT
Schmidt, JohannesJohannes.Schmidt (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Delfs, Jan WernerJan.Delfs (at) dlr.dehttps://orcid.org/0000-0001-8893-1747NICHT SPEZIFIZIERT
Rossignol, Karl-StephaneKarl-Stephane.Rossignol (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Pott-Pollenske, Michaelmichael.pott-pollenske (at) dlr.dehttps://orcid.org/0000-0002-9996-5624NICHT SPEZIFIZIERT
Siller, HenriHenri.Siller (at) dlr.dehttps://orcid.org/0009-0000-7155-6899NICHT SPEZIFIZIERT
Datum:13 Juni 2022
Erschienen in:28th AIAA/CEAS Aeroacoustics Conference, 2022
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.2514/6.2022-3040
Seitenbereich:Seiten 1-18
ISBN:978-162410664-4
Status:veröffentlicht
Stichwörter:noise reduction porous materials hollow flap jet-flap interaction
Veranstaltungstitel:28th AIAA/CEAS Aeroacoustics Conference
Veranstaltungsort:Southampton, UK
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:14 Juni 2022
Veranstaltungsende:17 Juni 2022
Veranstalter :AIAA/CEAS
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Umweltschonender Antrieb
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L CP - Umweltschonender Antrieb
DLR - Teilgebiet (Projekt, Vorhaben):L - Triebwerkskonzepte und -integration
Standort: Berlin-Charlottenburg , Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Technische Akustik
Institut für Antriebstechnik > Triebwerksakustik
Hinterlegt von: Jente, Christian
Hinterlegt am:13 Okt 2022 12:10
Letzte Änderung:24 Apr 2024 20:48

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