EXPERIMENTAL STUDY OF EVOLUTION OF CONTROLLED PERTURBATIONS IN A LONGITUDINAL VORTEX GENERATED IN A BOUNDARY LAYER ON A FLAT PLATE AT A MACH NUMBER M = 2
А. Д. Косинов, M. V. Piterimova, A. V. Shmakova, Н. В. Семёнов, Yu. G. Ermolaev
Abstract
Abstract Results of experimental studies are applied to compare the spatiotemporal amplitude distributions of controlled fluctuations in a linear and a weakly nonlinear phase of the development of a wave train in a homogeneous and an inhomogeneous boundary layer on a flat plate at a Mach number M = 2. (The flow is inhomogeneous due to a longitudinal steady perturbation generated by a pair of weak shock waves. Controlled perturbations are generated locally from the surface at a fixed power of a high-frequency glow discharge inside the model.) It is revealed that the inhomogeneity of the flow changes the mechanism of interaction of subharmonic perturbations. It is shown that the spatial synchronism of fluctuations of subharmonic frequency is violated in the center of the wave train.