SOME FEATURES OF DISTURBANCES EVOLUTION AND LAMINAR-TURBULENT TRANSITION OF A SUPERSONIC

Key words: swept wing, supersonic boundary layer, cross flow instability, laminar- turbulent transition. Abstract. The paper is devoted to an experimental study of stability and laminar-turbulent transition a three-dimensional supersonic boundary layer on swept wing. Experimental study was carried out in two kinds of experiment. First kind – evolution of controlled traveling disturbances. Another – evolution of natural fluctuations, but stationary disturbances are excited by distributed roughness. These experiments make possible to study evolution of traveling and stationary disturbances and also their interaction from the region of a linear stage of development up to the transition region are presented for the first time for supersonic boundary layer on swept wing. Results of experiments are qualitatively agreed with researches at subsonic speeds. Some features of interaction of stationary and running disturbances, characteristic only for a supersonic boundary layer are revealed. 1