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Memorias de investigación
Ponencias en congresos:
Experimental and Numerical Assessment of the Aeroelastic Stability of Blade Pair Packages
Año:2014
Áreas de investigación
  • Aeroacústica y vibraciones,
  • Turbomaquinaria
Datos
Descripción
The stabilizing effect of grouping rotor blades in pairs has been assessed both, numerically and experimentally. The bending and torsion modes of a low aspect ratio high speed turbine cascade tested in the non-rotating test facility at EPFL (Ecole Polytechnique Fédérale de Lausanne) have been chosen as the case study. The controlled vibration of 20 blades in travelling wave form was performed by means of an electromagnetic excitation system, enabling the adjustement of the vibration amplitude and inter blade phase at a given frequency. Unsteady pressure transducers located along the blade mid-section were used to obtain the modulus and phase of the unsteady pressure caused by the airfoil motion. The stabilizing effect of the torsion mode was clearly observed both in the experiments and the simulations, however the effect of grouping the blades in pairs in the minimum damping at the tested frequency was marginal in the bending mode. A numerical tool was validated using the available experimental data and then used to extend the results at lower and more relevant reduced frequencies. It is shown that the stabilizing effect exists for the bending and torsion modes in the frequency range typical of low-pressure turbines. It is concluded that the stabilizing effect of this configuration is due to the shielding effect of the pressure side of the airfoil that defines the passage of the pair on the suction side of the same passage, since the relative motion between both is null. This effect is observed both in the experiments and simulations.
Internacional
Si
Nombre congreso
ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
Tipo de participación
960
Lugar del congreso
Düsseldorf, Alemania
Revisores
Si
ISBN o ISSN
978-0-7918-4577-6
DOI
Fecha inicio congreso
16/06/2014
Fecha fin congreso
20/06/2014
Desde la página
176
Hasta la página
188
Título de las actas
ASME Proceedings | Aerodynamic Excitation and Damping (With Turbomachinery)
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Almudena Vega Coso (UPM)
  • Autor: Roque Corral Garcia (UPM)
  • Autor: Achim Zanker (École Polytechnique Fédérale de Lausanne (EPFL))
  • Autor: Peter Ott (École Polytechnique fédérale de Lausanne (EPFL))
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Departamento: Mecánica de Fluidos y Propulsión Aeroespacial
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