UNSTEADY AERO-HYDRODYNAMIC CHARACTERISTICS OF WING STRUCTURES AT THE INTERACTION WITH HARMONIC GUST

摘要

The theoretical and experimental investigating results of unsteady aero-hydrodynamic characteristics (AHCh) of wings conducted in the wind tunnel are presented in the paper. The task of investigations is the measurement of moment and force loads on the wing models at the influence of harmonic air gust. The velocity pulsations of flow were created by specially designed vortical generator, which allowed to disturb the flow in the wide range of Strouhal numbers. The results of experiments have shown that the relative sizes of a wing very essentially influence on the amplitude of the lifting force in the large frequency range of velocity pulsations of flow and well-known classic Sirs function for infinite wings are not applicable for the real wing structures. The developed PC program and received tests dependence of lifting force coefficient versus the numbers of Strouhal are recommended for use in calculating models of ship's wing elements for authentic determination of their AHCh at the designing.