Influence des Deformations Statiques d'une Voilure sur l'Aerodynamique Instationnaire (Influence of Static Deformation on a Wing in the Unsteady Aerodynamic),
OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES CHATILLON-SOUS-BAGNEUX (FRANCE)
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Modern civil transport airplanes, with large aspect ratio, like B767 or AIRBUS, show even in cruise condition important static deformations characterized essentially by an induced torsion due to the wing sweep angle. This deformation which is especially important at the wing tip, modifies the flow around a supercritical profile, very sensitive to the local incidence. The deformation influence on the flutter phenomenon was proved by wind tunnel tests on an elastic model. A series of flutter calculations using semi empirical corrections, extracted from wind tunnel tests, was undertaken to reduce the existing difference theory and experience.