Experimental study of perturbations modeled by a membrane in 2D and 3D boundary layers

Abstract The work is devoted to experimental studies of the dynamics development perturbations introduced by a membrane under various conditions. were carried out conditions low and moderate degree free-flow turbulence. It shown that impulsive motion generates localized longitudinal structure in boundary layer, as well wave packets at its fronts. A circular consisting forward oblique waves, while rectangular predominantly waves. turbulence inhibits linear stage intensifies nonlinear stage. separation layer stimulates an increase amplitude packets.