Rotary machine having non-uniform blade and vane spacing

• US 8,678,752 B2
• Filed: 10/20/2010
• Issued: 03/25/2014
• Est. Priority Date: 10/20/2010
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (GE Vernova, Inc.)
• Original Assignee: General Electric Company
• Inventors: Delvaux, John McConnell, Potter, Brian Denver
• Primary Examiner(s): Wiehe, Nathaniel
• Assistant Examiner(s): SEABE, JUSTIN D
• Application Number:
  US12/908,824
• Publication Number:
  US 20120099961A1
• Time in Patent Office: 1,252 Days
• Field of Search: 415/194, 415/195, 416/176, 416/203, 416/119.R, 416/220.R, 416/212.A, 416/19.R
• US Class Current: 415/119
• CPC Class Codes: F01D 5/142 of the blades of successive rotor or stator blade-rows
• CPC Class Codes: F01D 5/16 for counteracting blade vibration
• CPC Class Codes: F01D 5/26 Antivibration means not restricted to blade form or construction or to blade-to-blade connections or to the use of particular materials
• CPC Class Codes: F04D 29/324 Blades
• CPC Class Codes: F04D 29/328 with unequal distribution of blades around the hub
• CPC Class Codes: F04D 29/544 Blade shapes
• CPC Class Codes: F04D 29/666 by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
• CPC Class Codes: F05D 2240/80 Platforms for stationary or moving blades
• CPC Class Codes: F05D 2260/961 by mistuning rotor blades or stator vanes with irregular interblade spacing, airfoil shape

Abstract

A system, including a rotary machine including: a stator, a rotor configured to rotate relative to the stator, wherein the rotor comprises a plurality of blades having a non-uniform spacing about a circumference of the rotor.

Claims

1. A system, comprising:

a rotary machine comprising;

a stator; and

a rotor configured to rotate relative to the stator, wherein the rotor comprises at least four equally sized sectors about a circumference of the rotor, wherein each of the sectors comprises a different number of blades.

2. The system of claim 1, wherein a non-uniform spacing of the plurality of blades is configured to reduce resonant behavior in the rotary machine.

3. The system of claim 1, wherein the rotary machine comprises a turbine having the stator and the rotor.

4. The system of claim 1, wherein the rotary machine comprises a compressor having the stator and the rotor.

5. The system of claim 1, comprising a plurality of blades having a non-uniform spacing defined by a plurality of spacers with different widths in a circumferential direction about a circumference of the rotor, and each spacer of the plurality of spacers is disposed circumferentially between adjacent blades of the plurality of blades.

6. The system of claim 1, comprising a plurality of blades having a non-uniform spacing defined by a plurality of blade platforms with different widths in a circumferential direction about a circumference of the rotor, and each blade of the plurality of blades is coupled to a respective platform of the plurality of blade platforms.

16. The system of claim 1, wherein a blade spacing within one of the sectors is uniform.

17. The system of claim 1, wherein one or more sectors alternate between increasing and decreasing a blade spacing.

7. A system, comprising:

a rotary machine comprising;

a first stage comprising a plurality of first blades configured to rotate about an axis; and

a second stage comprising a plurality of second blades configured to rotate about the axis, wherein the plurality of second blades is offset relative to the plurality of first blades along the axis, and at least one of the plurality of first blades or the plurality of second blades has a non-uniform blade spacing about the axis, wherein the non-uniform blade spacing is defined by a plurality of blade platforms having different widths in a circumferential direction about the axis, and wherein each platform of the plurality of blade platforms comprises a single blade coupled to each platform.

8. The system of claim 7, wherein the non-uniform blade spacing is configured to reduce resonant behavior in the rotary machine.

9. The system of claim 7, wherein the rotary machine comprises a turbine, a compressor, or a combination thereof.

10. The system of claim 7, wherein the non-uniform blade spacing is further defined by a plurality of spacers having different widths in a circumferential direction about the axis, and each spacer of the plurality of spacers is disposed circumferentially between adjacent blades of the plurality of first blades or the plurality of second blades.

11. The system of claim 7, wherein the non-uniform blade spacing is defined by a plurality of equal sized sectors about the axis, and each sector of the plurality of equal sized sectors includes a different number of blades of the plurality of first blades or the plurality of second blades.

12. The system of claim 7, wherein the plurality of first blades has a first non-uniform blade spacing about the axis, and the plurality of second blades has a second non-uniform blade spacing about the axis.

18. The system of claim 7, wherein the widths of the plurality of blade platforms changes circumferentially about the axis in one or more patterns.

19. The system of claim 7, wherein the widths of the plurality of blade platforms alternate between increasing and decreasing widths.

13. A system, comprising:

a first turbine blade set comprising;

a plurality of first blades coupled to a turbine engine about a first axis, wherein at least some of the plurality of first blades have first blade platforms with different first widths in a first circumferential direction about the first axis to define a first non-uniform blade spacing, and each of the first blade platforms has a single first blade coupled to the first blade platform.

14. The system of claim 13, comprising a second turbine blade set comprising:

a plurality of second blades configured to couple to the turbine engine about a second axis, wherein at least some of the plurality of second blades have second blade platforms with different second widths in a second circumferential direction about the second axis to define a second non-uniform blade spacing, and each of the second blade platforms has a single second blade coupled to the second blade platform.

15. The system of claim 14, wherein the first or second non-uniform blade spacing is defined by a plurality of equal sized sectors about the first or second axis, and each sector of the plurality of equal sized sectors includes a different number of blades of the plurality of first blades or the plurality of second blades.

20. The system of claim 13, wherein the plurality of first blades are configured to rotate about the first axis.