Turbine vane, turbine blade, and gas turbine including the same

A turbine blade comprising:

• a sidewall configured to form an airfoil and include a leading edge and a trailing edge;
• a partition wall configured to partition an internal space of the sidewall to form a plurality of cooling channels;
• and
• a metering plate configured to block inlet parts of the plurality of cooling channels and include cooling holes communicating with respective cooling channels,
• wherein the metering plate includes a first cooling hole formed in the inlet part of each of the plurality of cooling channels, a second cooling hole formed directly behind the leading edge in the inlet part of the cooling channel adjacent to the leading edge among the plurality of cooling channels, and a guide formed on an upper surface of a trailing edge side of the second cooling hole to guide a cooling fluid to an inner side surface of the leading edge, the second cooling hole having a size smaller than a size of the first cooling hole.

A gas turbine comprising:

• a compressor configured to suction external air thereinto and compress the air;
• a combustor configured to mix fuel with air compressed by the compressor and combust a mixture of the fuel and the air;
• and
• a turbine configured to include a turbine blade and a turbine vane that are mounted in the turbine so that the turbine blade is rotated by combustion gas discharged from the combustor,
• wherein the turbine vane comprises:
• a sidewall configured to form an airfoil and include a leading edge and a trailing edge;
• a partition wall configured to partition an internal space of the sidewall to forma plurality of cooling channels;
• and
• a metering plate configured to block inlet parts of the plurality of cooling channels and include cooling holes communicating with respective cooling channels, and
• wherein the metering plate includes a first cooling hole formed in the inlet part of each of the plurality of cooling channels, a second cooling hole formed directly behind the leading edge in the inlet part of the cooling channel adjacent to the leading edge among the plurality of cooling channels, and a guide formed on an upper surface of a trailing edge side of the second cooling hole to guide a cooling fluid to an inner side surface of the leading edge, the second cooling hole having a size smaller than a size of the first cooling hole.