Airfoil shape for a turbine bucket and turbine incorporating same

• US 20090035146A1
• Filed: 08/02/2007
• Published: 02/05/2009
• Est. Priority Date: 08/02/2007
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (General Electric Company)
• Original Assignee: General Electric Company
• Inventors: Chiurato, Tony A., Perry, Jacob Charles II, Raica, Bogdan Razvan, Barua, Samar, Arness, Brian Peter, Chan, Sze Bun
• Granted Patent: US 7,988,420 B2
• Time in Patent Office: Days
• US Class Current: 416/223.R
• 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 5/142 of the blades of successive rotor or stator blade-rows
• CPC Class Codes: F05D 2250/74 given by a set or table of xyz-coordinates
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft
• 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 1 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, Y and Z 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 envelope of +/−.0.040 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 1 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 +/−

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

4. A turbine bucket according to claim 1 wherein the height of the turbine bucket from root to tip is 15.752 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 1 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, Y and Z distances 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 +/−

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

8. A turbine bucket according to claim 5 wherein the height of the turbine bucket from root to tip is 15.752 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 1 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 X represents a distance parallel to the turbine axis of rotation.

12. A turbine according to claim 9, wherein the height of the turbine bucket from root to tip is 15.752 inches.

13. A turbine according to claim 9, wherein the Z height between an axial centerline of said turbine wheel and a base of the airfoil as defined in Table 1 is 38.250 inches and which corresponds to the non-dimensionalized Z at 0.000.

14. A turbine according to claim 13, wherein the height of the turbine bucket from root to tip is 15.752 inches.

15. A turbine according to claim 9, wherein the X, Y and Z distances are 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 X represents a distance parallel to the turbine axis of rotation.

18. A turbine according to claim 15, wherein the height of the turbine bucket from root to tip is 15.752 inches.

19. A turbine according to claim 15, wherein the Z height between an axial centerline of said turbine wheel and a base of the airfoil as defined in Table 1 is 38.250 inches and which corresponds to the non-dimensionalized Z at 0.000.

20. A turbine according to claim 15, said airfoil shape lying in an envelope within +/−

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