The features of nonlinear development disturbances in a supersonic boundary layer in conditions of controllable experiments.

The results of an experimental research of nonlinear interaction of the artificial disturbances with a natural pulsations of a supersonic boundary layer on flat plate model at Mach number M=2 arc presented in paper. The spectra of pulsations were determined and the estimations of bicoherence coefficients were made. It was detected, that the interaction of artificial pulsations with natural disturbances in a supersonic boundary layer on the initial stage is observed in the band from 10 up to 20 kHz. The result of a most intensive interaction happens away from the wave train center of the artificial disturbances in spanwise direction. It was obtained, that in controlled experiments only the energy generated random disturbances gives the main contribution (up to 90 %) in increasing of level total pulsations and can play the important role in the earlier laminar-turbulent transition.