A review of the results from a series of experiments investigating the receptivity of a Blasius boundary layer to a number of different convected disturbances is presented. Harmonic, pulse and random two-dimensional disturbances were introduced by a vibrating ribbon positioned upstream of a flat plate. Two-dimensional roughness elements provided a receptivity site on the plate. A three-dimensional disturbance was generated by the pulsed displacement of a small wing. Finally the response of the boundary layer to turbulent fluctuations in the ribbon wake was measured.
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