Observatorio de I+D+i UPM

Memorias de investigación
Book chapters:
The Low Reduced Frequency Limit of Vibrating Airfoils. Part IIIa: Theoretical Quantification of the Unsteady Loading Parameter
Year:2015
Research Areas
  • Aeronautical engineering,
  • Aerodynamics,
  • Aeroelastics,
  • Turbomachinery
Information
Abstract
This paper studies the unsteady aerodynamics of vibrating airfoils in the low reduced frequency regime with special emphasis on its impact on the work per cycle curves. In Part I of the corresponding 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 pressure caused by the oscillation 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 flowfield on the airfoil surface and the vibration mode-shape. As a consequence, the effect of changing the design operating conditions 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 relevance of the parameter has been numerically confirmed in the Part IIIb of the paper.
International
Si
10.1115/GT2016-57213
Book Edition
Book Publishing
American Society of Mechanical Engineers
ISBN
978-0-7918-4984-2
Series
Book title
ASME Proceedings. Structural Mechanics and Vibration
From page
300
To page
311
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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