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Comparison of Unsteady Low- and Mid-Fidelity Propeller Aerodynamic Methods for Whirl Flutter Applications

Koch, Christopher und Böhnisch, Nils und Verdonck, Hendrik und Hach, Oliver und Braun, Carsten (2024) Comparison of Unsteady Low- and Mid-Fidelity Propeller Aerodynamic Methods for Whirl Flutter Applications. Applied Sciences, 14 (2), Seiten 1-28. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/app14020850. ISSN 2076-3417.

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Offizielle URL: https://www.mdpi.com/2076-3417/14/2/850

Kurzfassung

Aircraft configurations with propellers have been drawing more attention in recent times, partly due to new propulsion concepts based on hydrogen fuel cells and electric motors. These configurations are prone to whirl flutter, which is an aeroelastic instability affecting airframes with elastically supported propellers. It commonly needs to be mitigated already during the design phase of such configurations, requiring, among other things, unsteady aerodynamic transfer functions for the propeller. However, no comprehensive assessment of unsteady propeller aerodynamics for aeroelastic analysis is available in the literature. This paper provides a detailed comparison of nine different low- to mid-fidelity aerodynamic methods, demonstrating their impact on linear, unsteady aerodynamics, as well as whirl flutter stability prediction. Quasi-steady and unsteady methods for blade lift with or without coupling to blade element momentum theory are evaluated and compared to mid-fidelity potential flow solvers (UPM and DUST) and classical, derivative-based methods. Time-domain identification of frequency-domain transfer functions for the unsteady propeller hub loads is used to compare the different methods. Predictions of the minimum required pylon stiffness for stability show good agreement among the mid-fidelity methods. The differences in the stability predictions for the low-fidelity methods are higher. Most methods studied yield a more unstable system than classical, derivative-based whirl flutter analysis, indicating that the use of more sophisticated aerodynamic modeling techniques might be required for accurate whirl flutter prediction.

elib-URL des Eintrags:https://elib.dlr.de/202268/
Dokumentart:Zeitschriftenbeitrag
Titel:Comparison of Unsteady Low- and Mid-Fidelity Propeller Aerodynamic Methods for Whirl Flutter Applications
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Koch, ChristopherChristopher.Koch (at) dlr.dehttps://orcid.org/0000-0001-8014-3041151375875
Böhnisch, NilsNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Verdonck, HendrikHendrik.Verdonck (at) dlr.dehttps://orcid.org/0009-0007-8271-8292NICHT SPEZIFIZIERT
Hach, OliverOliver.Hach (at) dlr.dehttps://orcid.org/0000-0001-5317-4176NICHT SPEZIFIZIERT
Braun, CarstenNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:19 Januar 2024
Erschienen in:Applied Sciences
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:14
DOI:10.3390/app14020850
Seitenbereich:Seiten 1-28
Verlag:Multidisciplinary Digital Publishing Institute (MDPI)
Name der Reihe:Applied Sciences - Collection Structural Dynamics and Aeroelasticity
ISSN:2076-3417
Status:veröffentlicht
Stichwörter:aeroelasticity, flutter, propeller whirl flutter, unsteady aerodynamics, 1P hub loads
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Effizientes Luftfahrzeug
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L EV - Effizientes Luftfahrzeug
DLR - Teilgebiet (Projekt, Vorhaben):L - Digitale Technologien
Standort: Göttingen
Institute & Einrichtungen:Institut für Aeroelastik > Aeroelastische Simulation
Hinterlegt von: Koch, Christopher
Hinterlegt am:23 Jan 2024 14:36
Letzte Änderung:23 Jan 2024 14:36

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