Claims
- 1. A turbine bucket having a bucket airfoil shape in an envelope within ±0.160 inches in a direction normal to any airfoil surface location wherein the airfoil has an uncoated nominal profile substantially in accordance with Cartesian coordinate values of X, Y and z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at a radially innermost aerodynamic section of the airfoil and X and Y are coordinate values defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil shape.
- 2. A turbine bucket according to claim 1 forming part of a second stage of a turbine.
- 3. A turbine bucket having an uncoated nominal airfoil profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at a radially innermost aerodynamic section of the airfoil and X and Y are coordinate values defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil bucket profile;the X, Y and Z values being scaled as a function of the same constant or number to provide a scaled-up or scaled-down bucket airfoil.
- 4. A turbine bucket according to claim 3 forming part of a second stage of a turbine.
- 5. A turbine comprising a turbine wheel having a plurality of buckets, each of said buckets having an airfoil shape in an envelope within ±0.160 inches in a direction normal to any bucket airfoil surface location wherein the airfoil has an uncoated nominal profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at a radially innermost aerodynamic section of the airfoil and X and Y are coordinate values defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil shape.
- 6. A turbine according to claim 5 wherein the turbine wheel comprises a second stage of the turbine.
- 7. A turbine according to claim 5 wherein the turbine wheel has fifty buckets and X represents a distance parallel to a rotary axis of the turbine wheel.
- 8. A turbine comprising a turbine wheel having a plurality of buckets, each of said buckets having an uncoated nominal airfoil profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at the radially innermost aerodynamic section of the airfoil and X and Y are coordinate values defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil shape;the X and Y values being scaled as a function of the same constant or number to provide a scaled-up or scaled-down bucket airfoil.
- 9. A turbine according to claim 8 wherein the turbine wheel comprises a second stage of the turbine.
- 10. A turbine according to claim 8 wherein the turbine wheel has fifty buckets and X represents a distance parallel to a rotary axis of the turbine wheel.
Government Interests
This invention was made with Government support under Contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The Government has certain rights in this invention.
US Referenced Citations (7)
Number |
Name |
Date |
Kind |
5267834 |
Dinh et al. |
Dec 1993 |
A |
5299915 |
Dinh et al. |
Apr 1994 |
A |
5980209 |
Barry et al. |
Nov 1999 |
A |
6398489 |
Burdgick et al. |
Jun 2002 |
B1 |
6450770 |
Wang et al. |
Sep 2002 |
B1 |
6461109 |
Wedlake et al. |
Oct 2002 |
B1 |
6461110 |
By et al. |
Oct 2002 |
B1 |
Non-Patent Literature Citations (3)
Entry |
U.S. patent application Ser. No. 09/886,406, Pirolla et al., filed Jun. 2001. |
U.S patent application Ser. No. 09/899,543, Frost et al., filed Jul. 2001. |
U.S. patent application Ser. No. 09/903,853, Bielek et al., filed Jul. 2001. |