A fluid-flow machine includes an outer casing having a rotationally mounted rotor with three blade regions. The blade regions are divided into an inner blade region and two outer blade regions, the two outer blade regions pointing outward toward the outer casing end. The fluid-flow machine includes one or more outlet openings, via which the flow medium is divided into two partial flows. The two partial flows then flow through the respective outer blade regions. The invention also relates to a method of operating a steam turbine. |