Internal core profile for a turbine nozzle airfoil

A turbine comprising:

• a turbine nozzle extending from a platform to an end wall and having an airfoil-shaped cross section having a leading edge, a trailing edge, and a pressure side and a suction side each of which extends from the leading edge to the trailing edge,
• wherein the turbine nozzle comprises an airfoil portion having an uncoated nominal profile substantially in accordance with Cartesian coordinate values of X, Y, and Z set forth in Table 1,
• wherein the X, Y, and Z coordinates are distances in inches measured in a Cartesian coordinate system,
• wherein, at each Z distance, the corresponding X and Y coordinates, when connected by a smooth continuous arc, define one of a plurality of airfoil profile sections, and
• wherein the plurality of airfoil profile sections, when joined together by smooth continuous arcs, define an airfoil shape.

A gas turbine comprising:

• a compressor configured to compress air;
• a combustor configured to mix compressed air supplied from the compressor with fuel for combustion to generate combustion gas;
• and
• a turbine comprising a plurality of turbine nozzles and a plurality of turbine blades rotated by the combustion gas to generate power,
• wherein each of the turbine nozzles extending from a platform to an end wall and having an airfoil-shaped cross section having a leading edge, a trailing edge, and a pressure side and a suction side each of which extends from the leading edge to the trailing edge,
• wherein the turbine nozzle comprises an airfoil portion having an uncoated nominal profile substantially in accordance with Cartesian coordinate values of X, Y, and Z set forth in Table 1,
• wherein the X, Y, and Z coordinates are distances in inches measured in a Cartesian coordinate system,
• wherein, at each Z distance, the corresponding X and Y coordinates, when connected by a smooth continuous arc, define one of a plurality of airfoil profile sections, and
• wherein the plurality of airfoil profile sections, when joined together by smooth continuous arcs, define an airfoil shape.