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Numerical Investigation of Supersonic Flutter in Space Turbine Based on Unsteady Computations Linearized in the Frequency Domain in Response to a Prescribed Blade Motion
Laboratoire de Mécanique des Fluides et d'Acoustique, Ecole Centrale de Lyon, France.
2011 (English)In: International Forum of Aeroelasticity and Structural Dynamics, 2011Conference paper (Refereed)
Abstract [en]

Space turbines delivering power to spacecraft turbopumps can fail within seconds because of aeroelastic problems. In that framework, a three-dimensional numerical study of an assembled bladed disk part of a supersonic space turbine is performed for flutter investigations. The simulations are based on unsteady Reynolds Averaged Navier Stokes computations linearized in the frequency domain, and consist in the superposition of an unsteady linear (in time) pressure field, generated by a harmonic perturbation, upon a steady nonlinear (in space) flow. The aerodynamic damping coefficient is calculated for a range of nodal diameters with separate computations performed for forward and backward traveling waves at each nodal diameter. The blades are predicted aeroelastically unstable for the backward modes and stable for the forward modes. Quasi-steady analysis proved to be well suited to describe the mechanisms responsible for flutter. Instability appears when the pressure and velocity fluctuations are in-phase; the pressure fluctuations being controlled by the shock wave displacement, which is itself controlled by the blade motion.

Place, publisher, year, edition, pages
Keyword [en]
supersonic flutter, shock wave/boundary layer interaction, LRANS, nodal diameters, interblade phase angle, backward/forward modes, space turbine
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-48966OAI: diva2:458989
International Forum of Aeroelasticity and Structural Dynamics, IFASD 2011. Paris, France. 26-30 June 2011
QC 20111130Available from: 2011-11-24 Created: 2011-11-24 Last updated: 2011-11-30Bibliographically approved

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Ferria, Hakim
Fluid Mechanics and Acoustics

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