Fehrs, Michael und Hennings, Holger (2022) Aerodynamic Nonlinearities and Dynamic Stability in Transitional Airfoil Flows. In: 19th International Forum on Aeroelasticity and Structural Dynamics, IFASD 2022. IFASD 2022, 2022-06-13 - 2022-06-17, Madrid, Spanien. ISBN 978-840942353-8.
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Kurzfassung
This article presents an investigation on boundary layer transition induced aerodynamic nonlinearities, the dynamic stability of an airfoil in the vicinity of such nonlinearities, and the subsequent occurrence of limit cycle oscillations. To study such transitional nonlinear aerodynamics, the well-known experimental LCO case MP77 for the NLR7301 is considered. Although the LCO found for MP77 is not ascribed to boundary layer transition effects, it occurs in the vicinity of a strong nonlinearity in the moment curve that is most likely connected to shock-induced and transitional effects. A similar nonlinearity is created using a static model deformation. Steady results are then computed for the original and deformed airfoil with free and prescribed transition locations. For the target lift coefficient of the wind tunnel experiment, coupled unsteady CFD-CSM computations are performed. Although early results indicated an amplitude limiting effect in the vicinity of the aerodynamic nonlinearity, further investigations are not able to reproduce this behavior once the temporal discretization is improved. Based on this research, the working hypothesis that a transitional aerodynamic nonlinearity is providing the amplitude limiting effect for MP77 cannot be confirmed.
elib-URL des Eintrags: | https://elib.dlr.de/187024/ | ||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||
Titel: | Aerodynamic Nonlinearities and Dynamic Stability in Transitional Airfoil Flows | ||||||||||||
Autoren: |
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Datum: | Juni 2022 | ||||||||||||
Erschienen in: | 19th International Forum on Aeroelasticity and Structural Dynamics, IFASD 2022 | ||||||||||||
Referierte Publikation: | Ja | ||||||||||||
Open Access: | Nein | ||||||||||||
Gold Open Access: | Nein | ||||||||||||
In SCOPUS: | Ja | ||||||||||||
In ISI Web of Science: | Nein | ||||||||||||
ISBN: | 978-840942353-8 | ||||||||||||
Status: | veröffentlicht | ||||||||||||
Stichwörter: | boundary layer transition, limit cycle oscillations, transition modeling, transonic flow | ||||||||||||
Veranstaltungstitel: | IFASD 2022 | ||||||||||||
Veranstaltungsort: | Madrid, Spanien | ||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||
Veranstaltungsbeginn: | 13 Juni 2022 | ||||||||||||
Veranstaltungsende: | 17 Juni 2022 | ||||||||||||
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: | Fehrs, Michael | ||||||||||||
Hinterlegt am: | 29 Jun 2022 14:42 | ||||||||||||
Letzte Änderung: | 24 Apr 2024 20:48 |
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