By-pass transition to airfoil flutter by transient growth due to gust impulse

We present an experimental study which shows that the mechanism known as transient growth of energy, can cause flutter instability of a nonlinearly flexible airfoil at a wind velocity below the linear critical flutter velocity. A flap mounted upstream a flexible airfoil in a wind tunnel generates a...

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Bibliographic Details
Published in:Journal of fluids and structures 2009-11, Vol.25 (8), p.1272-1281
Main Authors: Schwartz, M., Manzoor, S., Hémon, P., de Langre, E.
Format: Article
Language:English
Subjects:
Aeroelasticity
By-pass transition
Engineering Sciences
Exact sciences and technology
Fluid mechanics
Fluids mechanics
Flutter
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Mechanics
Physics
Solid mechanics
Structural and continuum mechanics
Transient growth
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary:We present an experimental study which shows that the mechanism known as transient growth of energy, can cause flutter instability of a nonlinearly flexible airfoil at a wind velocity below the linear critical flutter velocity. A flap mounted upstream a flexible airfoil in a wind tunnel generates a single gust which triggers the plunge and pitch oscillations. This gust is characterized using two-component hot-wire anemometry. For the first time experimental evidence is provided to confirm the theoretical scenario of a by-pass transition to flutter by transient growth. From an engineering point of view, transient growth might explain also the premature structural fatigue encountered in structures subject to wind.
ISSN:0889-9746
1095-8622
DOI:10.1016/j.jfluidstructs.2009.08.001