FIELD: power engineering. SUBSTANCE: thermodynamic condition of fluid is changed in source 5 of heated fluid by supplying and burning out fuel and oxidizer, constricting flow, additional constricting of flow, and cooling fluid upstream of the turbine stage using exhaust fluid simultaneously with expanding which is carried out uniformly in the gas-turbine engine. The flowing section of source 5 of heated fluid has initial part 11, which is in communication with the sources of fuel and oxidizer, curved part, which is connected with the initial part, is diverging and has monotonic curvature, end part 15 adjacent to turbine stage 1, and two constrictions 16,17. One of the constrictions is positioned in the zone adjacent to initial part 11 and the other one is positioned upstream of turbine stage 1. Curved part 14 is interposed between constrictions 16,17. EFFECT: enhanced efficiency. 7 cl, 2 dwg
