Turbine blade tip shroud with axially offset cutter teeth, and related surface profiles and method

A turbine blade tip shroud, comprising:

• a pair of opposed, axially extending wings configured to couple to an airfoil at a radially outer end of the airfoil, the airfoil having a suction side and a pressure side opposing the suction side, a leading edge spanning between the pressure side and the suction side, and a trailing edge opposing the leading edge and spanning between the pressure side and the suction side;
• and
• a tip rail extending radially from the pair of opposed, axially extending wings, the tip rail having a downstream side, an upstream side opposing the downstream side, and a forward-most and radially outermost origin,
• wherein the sides of the tip rail have a shape having a nominal profile substantially in accordance with at least part of Cartesian coordinate values of X and Y set forth in TABLE I and originating at the forward-most and radially outermost origin, wherein the Cartesian coordinate values are non-dimensional values of from 0% to 100% convertible to distances by multiplying the X and Y values by a tip rail axial length expressed in units of distance, and wherein X and Y values are connected by lines to define a tip rail side surfaces profile.

A turbine blade tip shroud, comprising:

• a pair of opposed, axially extending wings configured to couple to an airfoil at a radial outer end of the airfoil, the airfoil having a pressure side and a suction side opposing the pressure side, a leading edge spanning between the pressure side and the suction side, and a trailing edge opposing the leading edge and spanning between the pressure side and the suction side;
• a tip rail extending radially from the pair of opposed, axially extending wings, the tip rail having a downstream side and an upstream side opposing the downstream side and a forward-most and radially outermost origin;
• and
• a leading edge surface and a trailing edge surface having a shape having a nominal profile substantially in accordance with at least part of Cartesian coordinate values of X, Y, and Z values set forth in TABLE II and originating at the forward-most and radially outermost origin, wherein the Cartesian coordinate values are non-dimensional values of from 0% to 100% convertible to distances by multiplying the values by a tip rail axial length, and wherein X, Y, and Z values are joined smoothly with one another to form a leading edge surface profile and a trailing edge surface profile.