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Relevance of whirl flutter for electric aircraft configurations

Koch, Christopher (2020) Relevance of whirl flutter for electric aircraft configurations. DLRK 2020 - Deutscher Luft- und Raumfahrtkongress, 01.-03. Sep.2020, Online.

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Abstract

In this paper, the relevance of propeller whirl flutter for (hybrid-) electric aircraft configurations is outlined. These new configurations in form of air taxis and commuter aircrafts often include propeller which are powered by lightweight electric motors and located at remote locations, e.g. the wing tip. This gives rise to an aeroelastic instability called whirl flutter, involving the gyroscopic whirl modes of the engine. The driving parameters for this instability are the dynamics of the mounting structure. Using a generic whirl flutter model of a propeller at the tip of a lifting surface, parameter studies on the flutter stability are carried out. The aeroelastic model consists of a dynamic MSC.Nastran beam model coupled with the unsteady ZAERO ZONA6 aerodynamic model and strip theory for the propeller aerodynamics. The parameter studies focus on the influence of different substructures (ranging from local engine mount stiffness to global aircraft dynamics) on the aeroelastic stability of the propeller. The results show a strong influence of the level of detail of the aeroelastic model on the flutter behaviour. The coupling with the lifting surface is of major importance, as it can stabilise the whirl flutter mode. Including wing unsteady aerodynamics into the analysis can also change the whirl flutter behaviour. This stresses the importance of including whirl flutter in the aeroelastic stability analysis on aircraft level.

Item URL in elib:https://elib.dlr.de/139569/
Document Type:Conference or Workshop Item (Speech)
Title:Relevance of whirl flutter for electric aircraft configurations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Koch, ChristopherChristopher.Koch (at) dlr.deUNSPECIFIED
Date:September 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:aeroelasticity, electric aircraft, flutter stability, propeller, whirl flutter
Event Title:DLRK 2020 - Deutscher Luft- und Raumfahrtkongress
Event Location:Online
Event Type:national Conference
Event Dates:01.-03. Sep.2020
Organizer:DGLR - Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal Oberath e.V.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Koch, Christopher
Deposited On:18 Dec 2020 16:54
Last Modified:18 Dec 2020 16:54

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