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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, 01.-03. Dez. 2021, Brüssel, Belgien.

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Abstract

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.

Item URL in elib:https://elib.dlr.de/146813/
Document Type:Conference or Workshop Item (Speech)
Additional Information: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).
Title:Jet-flap interaction noise in model scale and full scale - and the implications for evaluating noise reduction technologies
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Jente, ChristianChristian.Jente (at) dlr.dehttps://orcid.org/0000-0001-6115-3084
Date:2 December 2021
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Jet flap interaction Noise Jet surface interaction mid scale small scale comparison
Event Title:EU H2020 1st DJINN Conference: Industrially oriented jet noise reduction technologies
Event Location:Brüssel, Belgien
Event Type:international Conference
Event Dates:01.-03. Dez. 2021
Organizer:CFD Berlin and the von Karman Institute for Fluid Dynamics (VKI)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Future Engines and Engine Integration
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
Institute of Aerodynamics and Flow Technology > Leitungsbereich AS BS
Deposited By: Jente, Christian
Deposited On:09 Dec 2021 08:13
Last Modified:09 Dec 2021 08:13

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