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Memorias de investigación
Communications at congresses:
The Low Reduced Frequency Limit of Vibrating Airfoils. Part IIIa: Theoretical Quantification and Influence of Unsteady Loading
Year:2015
Research Areas
  • Aeroacustics and vibrations,
  • Turbomachinery
Information
Abstract
This paper studies the unsteady aerodynamics of vibrating air- foils in the low reduced frequency regime with special emphasis on its impact on the work per cycle curves. In Part I of the corre- sponding paper, a perturbation analysis of the linearized Navier- Stokes equations for real modes at low reduced frequency was presented and some conclusions were drawn. It was discovered that a new parameter, the unsteady loading, plays an essential role in the trends of the phase and modulus of the unsteady pres- sure caused by the vibration of the airfoil. In this third (a) part, the theory is extended in order to quantify the new parameter. It is shown that this parameter depends solely on the steady flow- field on the airfoil surface and the vibration mode-shape. As a consequence, the effect of changing the design operating condi- tions or the vibration mode onto the work-per-cycle curves (and therefore in the stability) can be easily predicted and, what is more important, quantified without conducting additional flutter analysis. The importance of the parameter has been numerically confirmed in the Part IIIb of the paper.
International
Si
Congress
ASME Turbo Expo 2016: Turbine Technical Conference and Exposition
960
Place
Seúl, Corea del Sur
Reviewers
Si
ISBN/ISSN
978-0-7918-4984-2
Start Date
13/06/2016
End Date
17/06/2016
From page
176
To page
190
ASME Proceedings | Aerodynamic Excitation and Damping
Participants
  • Autor: Roque Corral Garcia (UPM)
  • Autor: Almudena Vega Coso (UPM)
Research Group, Departaments and Institutes related
  • Creador: Departamento: Mecánica de Fluidos y Propulsión Aeroespacial
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
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