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Jet-flap interaction noise in model scale and full scale - and the implications for evaluating noise reduction technologies

Jente, Christian (2021) Jet-flap interaction noise in model scale and full scale - and the implications for evaluating noise reduction technologies. EU H2020 1st DJINN Conference: Industrially oriented jet noise reduction technologies, 2021-12-01 - 2021-12-03, Brüssel, Belgien.

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Kurzfassung

Jet-flap interaction (JFI) noise consists of both broadband effects and tonal components. The frequency range of the tonal components can be characterized with a cut-on and cut-off frequency [1]. The JFI tones are well-audible and significant for the model scale engines. In addition to this, for very large commercial jet engines (e.g. UHBR class), the (in model scale) high-frequent broadband-like JFI-noise becomes very relevant in full scale. It can be shown that JFI noise spectra of different model size experiments collapse as expected: Two geometrically similar JFI-experiments were conducted at AWB (large scale) and JEXTRA (small scale) where the model geometries differ by a relevant factor (2.5). These results indicate, that it is safe to derive full scale spectra from experimental model scale spectra. In order to account for the human hearing, weighting functions can be applied. A sensitivity study wrt. height gives hints about the relevance of two different frequency ranges of JFI noise, JFI noise below and above the tonal cut-off frequency.

elib-URL des Eintrags:https://elib.dlr.de/146813/
Dokumentart:Konferenzbeitrag (Vortrag)
Zusätzliche Informationen:The research leading to these results has (partly) received funding from the German Federal Ministry for Economic Affairs and Energy (BMWi) in the framework of the Luftfahrtforschungsprogramm (LuFo) project LIST (grant agreement number 20T1307B).
Titel:Jet-flap interaction noise in model scale and full scale - and the implications for evaluating noise reduction technologies
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Jente, ChristianChristian.Jente (at) dlr.dehttps://orcid.org/0000-0001-6115-3084NICHT SPEZIFIZIERT
Datum:2 Dezember 2021
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Jet flap interaction Noise Jet surface interaction mid scale small scale comparison
Veranstaltungstitel:EU H2020 1st DJINN Conference: Industrially oriented jet noise reduction technologies
Veranstaltungsort:Brüssel, Belgien
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:1 Dezember 2021
Veranstaltungsende:3 Dezember 2021
Veranstalter :CFD Berlin and the von Karman Institute for Fluid Dynamics (VKI)
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: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Technische Akustik
Institut für Aerodynamik und Strömungstechnik > Leitungsbereich AS BS
Hinterlegt von: Jente, Christian
Hinterlegt am:09 Dez 2021 08:13
Letzte Änderung:24 Apr 2024 20:45

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