Influence of the jet flowing from a gas generator through a narrow slit on shock-wave structure of a stream in the channel of variable section is investigated. Influence of the size of a jet, density and speed of gas on an entrance, and also influence of oscillations of parameters of a jet is studied. Possibility of management of a supersonic stream of shock-wave structure in the channel with the help pulse and periodic an energy supply before a jet is investigated at negative feedback on pressure.