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Camber effects in the dynamic aeroelasticity of compliant airfoils

Murua, J, Palacios, R and Peiró, J (2010) Camber effects in the dynamic aeroelasticity of compliant airfoils Journal of Fluids and Structures, 26 (4). 527 - 543.

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Abstract

This paper numerically investigates the effect of chordwise flexibility on the dynamic stability of compliant airfoils. A classical two-dimensional aeroelastic model is expanded with an additional degree of freedom to capture time-varying camber deformations, defined by a parabolic bending profile of the mean aerodynamic chord. Aerodynamic forces are obtained from unsteady thin airfoil theory and the corresponding compliant-airfoil inertia and stiffness from finite-element analysis. V–g and state-space stability methods have been implemented in order to compute flutter speeds. The study looks at physical realizations with an increasing number of degrees of freedom, starting with a camber-alone system. It is shown that single camber leads to flutter, which occurs at a constant reduced frequency and is due to the lock in between the shed wake and the camber motion. The different combinations of camber deformations with pitch and plunge motions are also studied, including parametric analyses of their aeroelastic stability characteristics. A number of situations are identified in which the flutter boundary of the compliant airfoil exhibits a significant dip with respect to the rigid airfoil models. These results can be used as a first estimation of the aeroelastic stability boundaries of membrane-wing micro air vehicles.

Item Type: Article
Additional Information: Copyright 2010 Elsevier Ltd. NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Fluids and Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Fluids and Structures, 26(4), May 2010, DOI 10.1016/j.jfluidstructs.2010.01.009
Uncontrolled Keywords: Conformable airfoils, Camber deformations, Flutter, Aeroelastic stability
Divisions: Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Depositing User: Symplectic Elements
Date Deposited: 20 Nov 2012 10:07
Last Modified: 23 Sep 2013 19:37
URI: http://epubs.surrey.ac.uk/id/eprint/714248

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