Influence of aerodynamic modeling on the whirl flutter stability of a propeller under axial and non-axial flow conditionsifasd2024 Tracking Number 150 Presentation: Session: Propellor aeroelasticity Room: Room 1.2 Session start: 11:00 Wed 19 Jun 2024 Vincent de Gaudemaris vincent.de_gaudemaris@onera.fr Affifliation: ONERA/LTDS Jean-Sébastien Schotté jean-sebastien.schotte@onera.fr Affifliation: ONERA Antoine Placzek antoine.placzek@onera.fr Affifliation: ONERA Laurent Blanc laurent.blanc@ec-lyon.fr Affifliation: LTDS Fabrice Thouverez fabrice.thouverez@ec-lyon.fr Affifliation: LTDS Topics: - Rotorcraft Aeroelasticity (High and low fidelity (un)coupled analysis methods:) Abstract: The next generation of propeller-driven aircraft raises new concerns about their stability regarding the whirl flutter phenomenon. This instability has to be evaluated early in the design phase, thereby raising a need for fast and robust prediction methods. The key to analyzing such instability is the modeling of the motion-induced aerodynamic loads on the propeller. This paper proposes to build and compare different aerodynamic modeling methods ranging from low- to mid-fidelity. The comparison of the resulting stability boundaries shows that certain low-fidelity models give results close to mid-fidelity, emphasizing the advantages of these fast low-fidelity methods for the whirl flutter prediction. The interest of mid-fidelity modeling techniques in the study of non-conventional situations is also looked at. In particular, the occurrence of whirl flutter under non-axial flow is studied. The obtained stability boundaries highlight a slight stabilizing influence, demonstrating that the axial flight situation remains a conservative framework for whirl flutter studies. |