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

A turbine ring segment comprising:

• a ring segment body mounted on an inner peripheral surface of a turbine housing and configured to surround a turbine blade;
• a recess formed in the ring segment body and disposed opposite to the turbine blade;
• a thin plate coupled to the recess to form a gap between the thin plate and a bottom surface of the recess, the thin plate having a plurality of cooling holes communicating with the gap;
• and
• a plurality of spiral guides formed on the bottom surface of the recess 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 gas turbine comprising:

• a compressor configured to draw and compress air;
• a combustor configured to produce combustion gas by mixing fuel with the compressed air for combustion;
• and
• 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.