M. Vial, L. Bellon and R. Hernandez, proceedings of the Décimo Congreso Chileno de Ingeniería Mecánica – COCIM 2002, Santiago de Chile, 15-18 October 2002
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We report experimental results on the dynamics of a flat plate wake submitted to an harmonic mechanical forcing. The system consist or a fixed flat plate with a small flap at the trailing edge which perform small oscillations when forced by an external shaker. At low Reynolds number, frequency response results display strong evidence or a spatio-temporal resonance of the near wake even though the forcing amplitude was very small. Arbitrary signals like discrete number of bursts and wave packets have been successfully propagated through the flat plate wake. Hot wire measurements and flow imaging through light scattering from smoke wire particles using a rapid ccd camera, allowed to record the inner and outer structure or the forced wake and to map the flow resonance.
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