Unsteady oscillation of a deformable airfoil section in incompressible flow |
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Authors: | T. V. Grishanina F. N. Shklyarchuk |
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Affiliation: | (1) Moscow Aviation Institute (State Technical University), Moscow, Russia |
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Abstract: | The unsteady aerodynamic loads (pressure increment and generalized forces) acting on a deformable thin airfoil section are determined for its arbitrary motion in the incompressible flow with transverse gusts. In this case, the exact Küssner solution in series is used for harmonic oscillation of an airfoil, in which the Theodorsen function is approximated by a sum of fractional functions with poles. In the time domain, these functions are replaced by the unknown functions that satisfy the one-type ordinary first order differential equations. The equations obtained are combined with the differential equations of the airfoil motion in the generalized coordinates and are used for analyzing the aeroelastic system stability and calculating its dynamic response to gust loads. |
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Keywords: | airfoil section aeroelastic oscillations unsteady motion aerodynamic load airfoil with aileron flutter |
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