Experimental evidence of transient growth of energy before airfoil flutter

P. Hémon; E. de Langre; P. Schmid

doi:10.1016/j.jfluidstructs.2005.11.005

Experimental evidence of transient growth of energy before airfoil flutter

P. Hémon, E. de Langre, P. Schmid

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25 Scopus citations

Abstract

This paper presents experimental evidence of the transient growth of energy for the coupled-mode flutter of an airfoil. The phenomenon occurs even in linearly stable dynamical systems. Its application is new in the context of fluid-structure interactions where only theoretical and numerical studies of transient growth exist. The experimental set-up allows an NACA 0015 airfoil to oscillate in rotational and vertical degrees of freedom when it is subjected to air-flow. Measurements consist of time series of the two motions obtained by laser displacement sensors. Structural parameters are first estimated without air-flow. The transient evolution of energy is measured, and amplification is observed for a given set of initial conditions. Our experiments agree well with numerical simulations based on unsteady airfoil theory. © 2005 Elsevier Ltd. All rights reserved.

Original language	English (US)
Pages (from-to)	391-400
Number of pages	10
Journal	Journal of Fluids and Structures
Volume	22
Issue number	3
DOIs	https://doi.org/10.1016/j.jfluidstructs.2005.11.005
State	Published - Apr 1 2006
Externally published	Yes

ASJC Scopus subject areas

Mechanical Engineering

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10.1016/j.jfluidstructs.2005.11.005

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title = "Experimental evidence of transient growth of energy before airfoil flutter",

abstract = "This paper presents experimental evidence of the transient growth of energy for the coupled-mode flutter of an airfoil. The phenomenon occurs even in linearly stable dynamical systems. Its application is new in the context of fluid-structure interactions where only theoretical and numerical studies of transient growth exist. The experimental set-up allows an NACA 0015 airfoil to oscillate in rotational and vertical degrees of freedom when it is subjected to air-flow. Measurements consist of time series of the two motions obtained by laser displacement sensors. Structural parameters are first estimated without air-flow. The transient evolution of energy is measured, and amplification is observed for a given set of initial conditions. Our experiments agree well with numerical simulations based on unsteady airfoil theory. {\textcopyright} 2005 Elsevier Ltd. All rights reserved.",

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AU - de Langre, E.

AU - Schmid, P.

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AB - This paper presents experimental evidence of the transient growth of energy for the coupled-mode flutter of an airfoil. The phenomenon occurs even in linearly stable dynamical systems. Its application is new in the context of fluid-structure interactions where only theoretical and numerical studies of transient growth exist. The experimental set-up allows an NACA 0015 airfoil to oscillate in rotational and vertical degrees of freedom when it is subjected to air-flow. Measurements consist of time series of the two motions obtained by laser displacement sensors. Structural parameters are first estimated without air-flow. The transient evolution of energy is measured, and amplification is observed for a given set of initial conditions. Our experiments agree well with numerical simulations based on unsteady airfoil theory. © 2005 Elsevier Ltd. All rights reserved.

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DO - 10.1016/j.jfluidstructs.2005.11.005

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EP - 400

JO - Journal of Fluids and Structures

JF - Journal of Fluids and Structures

IS - 3

ER -

Experimental evidence of transient growth of energy before airfoil flutter

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