Local contribution of blades vibration on the choke flutter instability in transonic UHBR fan
- Resource Type
- Authors
- Duquesne, Pierre; Rendu, Quentin; Ferrand, Pascal; Aubert, Stéphane
- Source
- 53rd 3AF International Conference on Applied Aerodynamics
53rd 3AF International Conference on Applied Aerodynamics, 3AF, Mar 2018, Salon de Provence, France
- Subject
- Physics::Fluid Dynamics
Choke flutter instability
[SPI.MECA.VIBR]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Vibrations [physics.class-ph]
[SPI.MECA.VIBR] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Vibrations [physics.class-ph]
- Language
- English
International audience; In this paper, an Ultra High Bypass Ratio fan is analyzed using a time-linearized Reynolds-Averaged Navier-Stokes equation solver to investigate the choke flutter. Simulations have been performed on a 2D blade to blade extraction. The steady flow exhibits a strong shock-wave which chokes the blade to blade channel. A flow separation zone can be noticed near the shock-wave on the suction side. The inter blade phase angle (IBPA) and the reduced frequency have been set to obtain a case with a choke flutter instability. The blade is decomposed in 424 subsections to track the contribution of local vibration to the global damping. Results analysis point to a restricted number of excitation sources at the trailing edge which induce a large part of the work exchange on a limited region of the airfoil. Main phenomena suspected are the shock-wave motion and the shock-wave / boundary layer interaction.