FIELD: engine engineering. SUBSTANCE: heated fluid is expanded. Thermodynamic condition of the fluid is changed upstream of the turbine stage using auxiliary fluid and fluid is fed to the turbine stage. A portion of exhaust fluid is removed downstream of the turbine stage, its thermodynamic condition is changed by introducing auxiliary fluid and exhaust fluid is mixed with heated and expanded fluid upstream of the turbine stage. The gas-turbine engine has turbine stage mounted inside flowing part 6, source of heated and expanded fluid, and device for changing thermodynamic condition of heated and expanded fluid by introducing auxiliary fluid. Source 1 of heated fluid has a zone for expanding heated fluid and zone 14 for mixing interposed between the expanding zone and inlet of turbine stage 7. The device for changing thermodynamic condition of exhaust fluid has the mixing zone which is in communication with turbine stage 7 and source 5 of auxiliary fluid from one side and with G part of mixing zone 14 of source 1 of heated fluid from the other side. The source is positioned from the side of the zone for expanding of heated fluid. EFFECT: enhanced efficiency. 8 cl, 2 dwg
