Turbine airfoil and turbine including same

A turbine comprising:

• a rotor disk configured to be rotatable;
• and
• a plurality of turbine blades installed on the rotor disk,
• wherein each of the turbine blades comprises an airfoil having an airfoil shape and including a leading edge and a trailing edge, a platform part coupled to a lower portion of the airfoil, and a root part protruding downward from the platform part and coupled to the rotor disk,
• wherein the airfoil comprises:
• a rear cooling path connected to the trailing edge to discharge air to the trailing edge;
• a plurality of cooling fins formed in the rear cooling path;
• and
• a flow guide rod connecting the cooling fins to support the cooling fins,
• wherein each of the plurality of cooling fins comprises an upper fin portion protruding upward from an upper portion of the flow guide rod, a lower fin portion protruding downward from a lower portion of the flow guide rod, and an intermediate fin portion inserted through the flow guide rod.

A gas turbine comprising:

• a compressor configured to compress air introduced from an outside;
• a combustor configured to mix the compressed air compressed by the compressor with fuel and combust an air-fuel mixture;
• and
• a turbine including a plurality of turbine blades rotating by combustion gas discharged from the combustor,
• wherein each of the turbine blades comprises an airfoil having an airfoil shape and including a leading edge and a trailing edge, a platform part coupled to a lower portion of the airfoil, and a root part protruding downward from the platform part and coupled to the rotor disk,
• wherein the airfoil comprises:
• a rear cooling path connected to the trailing edge to discharge air to the trailing edge;
• a plurality of cooling fins formed in the rear cooling path;
• and
• a flow guide rod connecting the cooling fins to support the cooling fins,
• wherein each of the plurality of cooling fins comprises an upper fin portion protruding upward from an upper portion of the flow guide rod, a lower fin portion protruding downward from a lower portion of the flow guide rod, and an intermediate fin portion inserted through the flow guide rod.