Observatorio de I+D+i UPM

Memorias de investigación
Book chapters:
The Low Reduced Frequency Limit of Vibrating Airfoils. Part IIIb: Numerical 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. Simulations using a frequency domain linearized Navier-Stokes solver have been carried out on rows of a low-pressure turbine airfoil section, the NACA65 section and a flat plate, to show the correlation between the actual value of the unsteady loading parameter (ULP), theoretically derived in Part IIIa, and the flutter characteristics, for different airfoils, operating conditions and mode-shapes. Both, the traveling-wave and influence coefficient formulations of the problem are used in combination to increase the understanding of the ULP influence in different aspects of the unsteady flowfield. It is concluded that, for a blade vibrating in a prescribed motion at design conditions, the ULP can quantitatively predict the effect of loading variations due to changes in the incidence, and also in the mode shape. It is also proved that the unsteady loading parameter can be used to compare the flutter characteristics of different airfoils.
International
Si
10.1115/GT2016-57288
Book Edition
Book Publishing
American Society of Mechanical Engineers
ISBN
978-0-7918-4984-2
Series
Book title
ASME Proceedings | Aerodynamic Excitation and Damping
From page
300
To page
312
Participants
  • Autor: Almudena Vega Coso (UPM)
  • Autor: Roque Corral Garcia (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
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)