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. © 2005 Elsevier Ltd. All rights reserved.
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Pascal Hémon, Emmanuel De Langre, Peter Schmid. Experimental evidence of transient growth of energy before airfoil flutter. Journal of Fluids and Structures, Elsevier, 2006, 22 (3), pp.391-400. 〈10.1016/j.jfluidstructs.2005.11.005〉. 〈hal-01023356〉



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