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Abstract
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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. 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. | |
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International
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Si |
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Congress
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ASME Turbo Expo 2016: Turbine Technical Conference and Exposition |
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960 |
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Place
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Seúl, Corea del Sur |
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Reviewers
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Si |
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ISBN/ISSN
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978-0-7918-4984-2 |
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Start Date
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13/06/2016 |
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End Date
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17/06/2016 |
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From page
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176 |
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To page
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190 |
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ASME Proceedings | Aerodynamic Excitation and Damping |