Airfoil shape for a turbine nozzle

• US 6,866,477 B2
• Filed: 07/31/2003
• Issued: 03/15/2005
• Est. Priority Date: 07/31/2003
• Status: Active Grant

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Siden, Gunnar Leif, Arness, Brian Peter, Krishnakumar, Poornathresan, Selent, Peter Christopher, Smith, Bruce Loren, By, Robert Romany
• Primary Examiner(s): VERDIER, CHRISTOPHER M
• Application Number:
  US10/630,750
• Publication Number:
  US 20050025618A1
• Time in Patent Office: 593 Days
• Field of Search: 415/191, 415/192, 415/193, 415/208.1, 415/208.2, 415/209.1, 415/209.4, 415/210.1, 415/211.2, 416/223.R, 416/223.A, 416/243, 416/DIG.2, 416/DIG.5
• US Class Current: 415/191
• 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

Abstract

The third stage nozzle has an airfoil profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in Table I wherein X and Y values are in inches and define airfoil profile sections at each distance Z and Z are non-dimensional values within a range from 0.1 to 0.9 convertible to Z distances in inches by multiplying the Z values of Table I within the range by a height of the airfoil in inches. The profile sections at the Z distances are joined smoothly with one another to form the nozzle airfoil shape. The X and Y distances may be scalable to provide a scaled-up or scaled-down airfoil for the nozzle. The nominal airfoil given by the X, Y and Z distances lies within an envelope of ±0.160 inches.

Claims

1. A turbine nozzle 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 within a range from 0.1 to 0.90 convertible to Z distances in inches by multiplying the Z values of Table I within said range by a height of the airfoil in inches, and wherein the X and Y values are distances in inches which, when connected by smooth continuing arcs, define airfoil profile sections at each distance Z within said range thereof, the profile sections at the Z distances within said range being joined smoothly with one another to form said nozzle airfoil shape.

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

3. A turbine nozzle according to claim 1 wherein the airfoil has a root radius of 29.255 inches at a trailing edge thereof and a height of 15.420 inches along the trailing edge, said nozzle comprising part of a third stage of a turbine.

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

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

7. A turbine nozzle according to claim 4 wherein the airfoil has a root radius of 29.255 inches at a trailing edge thereof and a height of 15.420 inches along the trailing edge, said nozzle comprising part of a third stage of a turbine.

5. A turbine nozzle 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 within a range from 0.1 to 0.9 convertible to Z distances in inches by multiplying the Z values of Table I within said range by a height of the airfoil in inches, and wherein the X and Y values are distances in inches which, when connected by smooth continuing arcs, define airfoil profile sections at each distance Z within said range thereof, the profile sections at the Z distances within said range thereof being joined smoothly with one another to form said nozzle 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 nozzle according to claim 5 forming part of a third stage of a turbine.

8. A turbine comprising a turbine stage having a plurality of nozzles, each of said nozzles 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 within a range from 0.1 to 0.9 convertible to Z distances in inches by multiplying the Z values of Table I within said range by a height of the airfoil in inches, and wherein X and Y values are distances in inches which, when connected by smooth continuing arcs, define airfoil profile sections at each distance Z within said range, the profile sections at the Z distances within said range being joined smoothly with one another to form said nozzle airfoil shape.

9. A turbine according to claim 8 wherein the turbine nozzle comprises part of a third stage of the turbine.

10. A turbine according to claim 8 wherein the turbine stage has 64 airfoils and coordinate value Y extends parallel to an axis of rotation of the turbine.

11. A turbine according to claim 8 wherein each of the airfoils has a root radius of 29.255 inches at a trailing edge thereof and a height of 15.420 inches along the trailing edge, said turbine nozzle comprising a part of a third stage of the turbine.

12. A turbine according to claim 8 wherein said airfoil shape lies in an envelope within ±

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