Surface profiles for tip rails of turbine blade tip shroud

A turbine blade tip shroud, comprising:

• a platform configured to couple to an airfoil of a turbine blade at a radial outer end of the airfoil, the airfoil having a pressure side and a suction side opposing the pressure side;
• a rear tip rail extending radially from the platform, the rear tip rail having a downstream side, an upstream side opposing the downstream side and a first origin on the pressure side of the airfoil and at a radial outermost point farthest from the pressure side of the airfoil;
• and
• a front tip rail extending radially from the platform at a location axially forward of the rear tip rail, the front tip rail having a downstream side, an upstream side opposing the downstream side and a second origin on the pressure side of the airfoil and at a radial outermost point farthest from the pressure side of the airfoil, and
• wherein the rear tip rail further includes a third origin on the suction side of the airfoil and at a radial outermost point farthest from the suction side of the airfoil, and wherein the downstream side of the rear tip rail has a shape having a nominal profile in accordance with Cartesian coordinate values of X, Y, Z and thickness values set forth in TABLE II and originating at the third origin, wherein the Cartesian coordinate values set forth in TABLE II are non-dimensional values of from 0% to 100% convertible to distances by multiplying the Cartesian coordinate values of X, Y, Z set forth in TABLE II by a minimum rear tip rail X-wise extent, and wherein the X and Y values set forth in TABLE II are joined smoothly to define a rear tip rail, first downstream side surface profile.

A turbine blade tip shroud, comprising:

• a platform configured to couple to an airfoil of a turbine blade at a radial outer end of the airfoil, the airfoil having a pressure side and a suction side opposing the pressure side;
• a rear tip rail extending radially from the platform, the rear tip rail having a downstream side, an upstream side opposing the downstream side and a first origin on the pressure side of the airfoil and at a radial outermost point farthest from the pressure side of the airfoil;
• and
• a front tip rail extending radially from the platform at a location axially forward of the rear tip rail, the front tip rail having a downstream side, an upstream side opposing the downstream side and a second origin on the pressure side of the airfoil and at a radial outermost point farthest from the pressure side of the airfoil, and
• wherein the upstream side of the rear tip rail has a shape having a nominal profile in accordance with Cartesian coordinate values of X, Y, and Z set forth in TABLE III and originating at the first origin, wherein the Cartesian coordinate values X, Y, Z set forth in TABLE III are non-dimensional values of from 0% to 100% convertible to distances by multiplying the Cartesian coordinate values of X, Y, and Z set forth in TABLE III by a minimum rear tip rail X-wise extent expressed in units of distance, and wherein the Cartesian coordinate values of X, Y, and Z set forth in TABLE III are connected by lines to define a rear tip rail, upstream side surface profile.

A turbine blade tip shroud, comprising:

• a platform configured to couple to an airfoil of a turbine blade at a radial outer end of the airfoil, the airfoil having a pressure side and a suction side opposing the pressure side;
• a rear tip rail extending radially from the platform, the rear tip rail having a downstream side, an upstream side opposing the downstream side and a first origin on the pressure side of the airfoil and at a radial outermost point farthest from the pressure side of the airfoil;
• and
• a front tip rail extending radially from the platform at a location axially forward of the rear tip rail, the front tip rail having a downstream side, an upstream side opposing the downstream side and a second origin on the pressure side of the airfoil and at a radial outermost point farthest from the pressure side of the airfoil, and
• wherein the downstream side of the front tip rail has a shape having a nominal profile in accordance with Cartesian coordinate values of X, Y, Z set forth in TABLE IV and originating at the second origin, wherein the Cartesian coordinate values X, Y, Z set forth in TABLE IV are non-dimensional values of from 0% to 100% convertible to distances by multiplying the Cartesian coordinate values of X, Y, and Z set forth in TABLE IV by a minimum rear tip rail X-wise extent, and wherein the Cartesian coordinate values of X, Y, and Z set forth in TABLE IV are joined smoothly with one another to define a front tip rail, downstream side surface profile.