Airfoil shape and sidewall flowpath surfaces for a turbine nozzle

A turbine nozzle having a suction side airfoil surface, said suction side airfoil surface having a nominal profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in inches in Table II, wherein the Z values are drop dimensions from a reference point origin on an outside diameter flowpath along a nozzle airfoil stacking axis perpendicular to a centerline axis of rotation of the turbine;

• and wherein the X and Y values, when connected by smooth continuing arcs, define suction side airfoil surface profile sections at each distance Z from said origin, the profile sections at the Z distances being joined smoothly with one another to form a suction side airfoil surface shape.

A turbine nozzle having an outer sidewall surface, said outer sidewall surface having a nominal profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in inches in Table III, wherein the Z values are drop dimensions from a reference point origin on an outside diameter flowpath along a nozzle airfoil stacking axis perpendicular to a centerline axis of rotation of the turbine;

• and wherein the X and Y values, when connected by, smooth continuing arcs at each distance Z, define an outer sidewall surface shape.

A turbine nozzle having an inner sidewall surface, said inner sidewall surface having a nominal profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in inches in Table IV, wherein the Z values are drop dimensions from a reference point origin on an outside diameter flowpath along a nozzle airfoil stacking axis perpendicular to a centerline axis of rotation of the turbine;

• and wherein the X and Y values, when connected by smooth continuing arcs at each distance Z, define an inner sidewall surface shape.

A turbine comprising a turbine nozzle having a plurality of airfoils having an airfoil shape, each said airfoil having pressure and suction side airfoil surfaces defining a nominal airfoil profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in Tables I and II, wherein the Z values are drop dimensions from a reference point origin on an outside diameter flowpath along a nozzle airfoil stacking axis perpendicular to a centerline axis of rotation of the turbine, and wherein the X and Y values, when connected by smooth continuing arcs, define airfoil profile sections at each distance Z, the profile sections at the Z distances being joined smoothly with one another to form an airfoil shape.