Rotor having improved structure, and turbine and gas turbine including the same

A turbine cooled by compressed air supplied from a compressor of a gas turbine, the turbine comprising:

• a stator that includes a casing and a vane coupled to an inner circumferential surface of the casing;
• and
• a rotor that includes
• a disk having an outer circumferential surface;
• a plurality of blade airfoils arranged around the disk and disposed between the vanes;
• and
• a plurality of platforms coupled to the outer circumferential surface of the disk, each platform having an outer circumferential surface to receive a corresponding blade airfoil and side-facing surfaces which are spaced apart from each other on adjacent platforms of the plurality of platforms to form a cooling passage through which the compressed air flows outward in a radial direction of the rotor, the cooling passage including a bend in a rotational direction of the rotor.

A gas turbine comprising:

• a compressor that sucks and compresses air;
• a combustor that produces a combustion gas by burning fuel and the compressed air;
• and
• a turbine that generates power by passing the combustion gas and includes
• a stator that includes a casing and a vane coupled to an inner circumferential surface of the casing;
• and
• a rotor that includes a disk having an outer circumferential surface;
• a plurality of blade airfoils arranged around the disk and disposed between the vanes;
• and a plurality of platforms coupled to the outer circumferential surface of the disk, each platform having an outer circumferential surface to receive a corresponding blade airfoil and side-facing surfaces which are spaced apart from each other on adjacent platforms of the plurality of platforms to form a cooling passage through which the compressed air flows outward in a radial direction of the rotor, the cooling passage including a bend in a rotational direction of the rotor.