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Drivers of Jet-flap interaction noise: The thrust vs. shear layer difference velocity experiment

Jente, Christian (2021) Drivers of Jet-flap interaction noise: The thrust vs. shear layer difference velocity experiment. EU H2020 1st DJINN Conference: Industrially oriented jet noise reduction technologies, 01.-03. Dez. 2021, Brüssel, Belgien.

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Abstract

The fundamentals of jet-flap interaction (JFI) are not fully known. One of the open questions is the search for the velocity scaling similarity parameter. While the scaling exponent is known to be n=5...6 from static JFI experiments (single-phase), the two-phase flight ops JFI problem produces more than one suitable flow parameter candidate. Promising scaling parameters are thrust velocity and shear layer (S/L) difference velocity. These two velocity parameters are played out against one another in order to force a definitive experimental result. The changes in build length due to using different operational parameters are calculated. The experimental parameter room is limited by max velocity limits of wind tunnel air and pressurized air (volumetric limit or sonic jet velocity), by quasi-static velocity ratio (for closed-circuit wind tunnel) and either upper limit of JFI effect or velocity profile type (here strong normal velocity profiles). The derived experiment is tailored to force a definite result wrt. thrust or S/L velocity. If this experiment does not give a clear result, JFI scaling cannot be easily modelled. A next step could be for example the measurement of downwash-velocities, i.e. flow properties which are more complex to determine and may require a build-dependent model.

Item URL in elib:https://elib.dlr.de/146812/
Document Type:Conference or Workshop Item (Speech)
Title:Drivers of Jet-flap interaction noise: The thrust vs. shear layer difference velocity experiment
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Jente, ChristianChristian.Jente (at) dlr.dehttps://orcid.org/0000-0001-6115-3084
Date:3 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 noise scaling Jet flap interaction JFI Jet surface interaction thrust
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 of Aerodynamics and Flow Technology > Leitungsbereich AS BS
Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Jente, Christian
Deposited On:09 Dec 2021 08:10
Last Modified:09 Dec 2021 08:10

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