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Descripción
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| 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. 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), theo- retically 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 flow- field. 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 character- istics of different airfoils. | |
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Internacional
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Si |
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Nombre congreso
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ASME Turbo Expo 2016: Turbine Technical Conference and Exposition |
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Tipo de participación
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960 |
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Lugar del congreso
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Seúl, Corea del Sur |
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Revisores
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Si |
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ISBN o ISSN
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978-0-7918-4984-2 |
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DOI
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Fecha inicio congreso
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13/06/2016 |
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Fecha fin congreso
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17/06/2016 |
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Desde la página
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176 |
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Hasta la página
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190 |
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Título de las actas
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ASME Proceedings | Aerodynamic Excitation and Damping |