Turbine vane, ring segment, and gas turbine including the same

A gas turbine comprising:

• a compressor configured to draw and compress air creating a compressed air;
• a combustor configured to produce a combustion gas by mixing fuel with the compressed air for combustion;
• a turbine that is housed in a turbine housing and includes a plurality of turbine blades rotated by the combustion gas and a plurality of turbine vanes fixed to the turbine housing and respectively disposed between the turbine blades, each turbine vane comprising:
• an outer sidewall configured to form an airfoil comprising a leading edge and a trailing edge;
• an inner sidewall disposed inside the outer sidewall to form a gap between the inner sidewall and an inner surface of the outer sidewall, the inner sidewall having a plurality of cooling holes communicating with the gap;
• and
• a plurality of spiral guides formed on the inner surface of the outer sidewall and disposed at positions facing the respective cooling holes, the plurality of spiral guides configured to guide a cooling fluid having passed through the cooling holes to impinge on the spiral guides,
• a turbine ring segment mounted on an inner peripheral surface of the turbine housing, the turbine ring segment comprising:
• a ring segment body configured to surround the plurality of turbine blades;
• a recess formed in the ring segment body and disposed opposite to the turbine blades;
• a thin plate coupled to the recess to form a second gap between the thin plate and a bottom surface of the recess, the thin plate having a second plurality of cooling holes communicating with the second gap;
• and
• a second plurality of spiral guides formed on the bottom surface of the recess and disposed at positions facing the respective second plurality of cooling holes, the second plurality of spiral guides configured to guide a second cooling fluid having passed through the second plurality of cooling holes to impinge on the second plurality of spiral guides.