AIRFOIL SHAPE FOR A TURBINE BUCKER

• US 20050019160A1
• Filed: 07/23/2003
• Published: 01/27/2005
• Est. Priority Date: 07/23/2003
• Status: Active Grant

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Hyde, Susan Marie, By, Robert Romany, Schaeffer, Jon Conrad, Tressler, Judd Dodge, Sims, Calvin Levy
• Granted Patent: US 6,910,868 B2
• Time in Patent Office: Days
• US Class Current: 415/213.100
• CPC Class Codes: F01D 5/141 Shape, i.e. outer, aerodynamic form F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147
• CPC Class Codes: F01D 5/225 by shrouding
• CPC Class Codes: F05D 2250/70 Shape
• CPC Class Codes: F05D 2250/74 given by a set or table of xyz-coordinates
• CPC Class Codes: Y10S 416/02 Formulas of curves

Abstract

Third stage turbine buckets have airfoil profiles substantially in accordance with Cartesian coordinate values of X, Y and Z set forth Table I wherein X and Y values are in inches and the Z values are non-dimensional values from 0 to 0.938 convertible to Z distances in inches by multiplying the Z values by the height of the airfoil in inches. The X and Y values are distances which, when connected by smooth continuing arcs, define airfoil profile sections at each distance Z. The profile sections at each distance Z are joined smoothly to one another to form a complete airfoil shape. The X and Y distances may be scalable as a function of the same constant or number to provide a scaled up or scaled down airfoil section for the bucket. The nominal airfoil given by the X, Y and Z distances lies within an envelop of ±0.150 inches in directions normal to the surface of the airfoil.

Claims

1. A turbine bucket including a bucket airfoil having an airfoil shape, said airfoil having a nominal profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in Table I wherein the Z values are non-dimensional values from 0 to 0.938 convertible to Z distances in inches by multiplying the Z values by a height of the airfoil in inches, and wherein X and Y are distances in inches which, 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 a complete airfoil shape.

2. A turbine bucket according to claim 1 forming part of a third stage of a turbine.

3. A turbine bucket according to claim 1 wherein said airfoil shape lies in an envelope within ±

0.150 inches in a direction normal to any airfoil surface location.

4. A turbine bucket according to claim 1 wherein the height of the airfoil from a value of Z=0 to a value of Z=0.938 is 15.146 inches.

5. A turbine bucket including a bucket airfoil having an uncoated nominal airfoil profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in Table I wherein the Z values are non-dimensional values from 0 to 0.938 convertible to Z distances in inches by multiplying the Z values by a height of the airfoil in inches, and wherein X and Y are distances in inches which, when connected by smooth continuing arcs, define airfoil profile sections at each Z distance, the profile sections at the Z distances being joined smoothly with one another to form a complete airfoil shape, the X and Y values being scalable as a function of the same constant or number to provide a scaled-up or scaled-down airfoil.

6. A turbine bucket according to claim 5 forming part of a third stage of a turbine.

7. A turbine bucket according to claim 5 wherein said airfoil shape lies in an envelope within ±

0.150 inches in a direction normal to any airfoil surface location.

8. A turbine bucket according to claim 5 wherein the height of the airfoil from a value of Z=0 to a value of Z=0.938 is 15.146 inches.

9. A turbine comprising a turbine wheel having a plurality of buckets, each of said buckets including an airfoil having an airfoil shape, said airfoil having a nominal profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in Table I wherein the Z values are non-dimensional values from 0 to 0.938 convertible to Z distances in inches by multiplying the Z values by a height of the airfoil in inches, and wherein X and Y are distances in inches which, when connected by smooth continuing arcs, define the airfoil profile sections at each distance Z, the profile sections at the Z distances being joined smoothly with one another to form a complete airfoil shape.

10. A turbine according to claim 9 wherein the turbine wheel comprises a third stage of the turbine.

11. A turbine according to claim 9 wherein the turbine wheel has 92 buckets and X represents a distance parallel to the turbine axis of rotation.

12. A turbine according to claim 9 wherein the height of the airfoil from a value of Z=0 to a value of Z=0.938 is 15.146 inches.

13. A turbine according to claim 9 wherein the radial height between an axial centerline of said turbine wheel and a hub radius of each bucket airfoil at a leading edge thereof is 40.716 inches, the non-dimensionalized Z value at Z=0.000 starting at a radial height 41.891 inches from the axial centerline of the turbine wheel.

14. A turbine according to claim 13 wherein the height of the airfoil from a value of Z=0 to a value of Z=0.938 is 15.146 inches.

15. A turbine comprising a turbine wheel having a plurality of buckets, each of said buckets including an airfoil having an uncoated nominal airfoil profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in Table I wherein the Z values are non-dimensional values from 0 to 0.938 convertible to Z distances in inches by multiplying the Z values by a height of the airfoil in inches, and wherein X and Y are distances in inches which, 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 a complete airfoil shape, the X and Y distances being scalable as a function of the same constant or number to provide a scaled-up or scaled-down bucket airfoil.

16. A turbine according to claim 15 wherein the turbine wheel comprises a third stage of the turbine.

17. A turbine according to claim 15 wherein the turbine wheel has 92 buckets and X represents a distance parallel to the turbine axis of rotation.

18. A turbine according to claim 15 wherein the height of the airfoil from a value of Z=0 to a value of Z=0.938 is 15.146 inches.

19. A turbine according to claim 15 wherein the radial height between an axial centerline of said turbine wheel and a hub radius of each bucket at a leading edge thereof is 40.716 inches, the non-dimensionalized Z value at 0.000 starting at a radial height 41.891 inches from the axial centerline of the turbine wheel.

20. A turbine according to claim 19 wherein the height of the airfoil from a value of Z=0 to a value of Z=0.938 is 15.146 inches.

21. A turbine according to claim 15 wherein the Z=0 coordinate value corresponds to 1.175 inches radially outwardly of an inlet hub radius of 40.716 inches at the leading edge of the airfoil.