Turbomachine bucket having flow interrupter and related turbomachine

Patent metadata

Field	Value
Publication number	US-9644483-B2
Application number	US-201313782036-A
Country	US
Kind code	B2
Filing date	Mar 1, 2013
Priority date	Mar 1, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

Various embodiments include a turbomachine bucket having a flow interrupter, as well as related turbomachines. Various embodiments include a turbomachine bucket having: a base section sized to couple with a turbomachine rotor, the base section having a leading edge and a trailing edge opposing the leading edge; a blade section coupled to the base section and aligned to extend radially from the base section; a shroud coupled to the blade section and aligned to extend radially from the blade section; and a flow interrupter coupled to the leading edge of the base section.

First claim

We claim:

1. A turbomachine bucket comprising:
a base section sized to couple with a turbomachine rotor, the base section having a leading edge and a trailing edge opposing the leading edge,
wherein the leading edge of the base section includes a planar surface;
a blade section coupled to the base section and aligned to extend radially from the base section;
a shroud coupled to the blade section and aligned to extend radially from the blade section; and
a single flow interrupter coupled to the leading edge of the base section,
wherein the single flow interrupter includes a planar face extending from the planar surface of the leading edge of the base section such that the entire planar face of the flow interrupter is coplanar to the planar surface of the leading edge of the base section, and
wherein the single flow interrupter has a substantially equal width as the blade section proximate a joint between the flow interrupter and the blade section, the width of the blade section and the width of the flow interrupter being measured along the leading edge of the base section.

2. The turbomachine bucket of claim 1 , wherein the flow interrupter includes a flange extending at least partially axially from the leading edge of the base section to a weld joint between the flow interrupter and the blade section.

3. The turbomachine bucket of claim 1 , wherein the leading edge of the base section includes a substantially chamfered surface proximate a joint between the base section and the blade section, and wherein the flow interrupter extends from the chamfered surface.

4. The turbomachine bucket of claim 3 , wherein the planar surface of the leading edge of the base section is continuous with the substantially chamfered surface.

5. The turbomachine bucket of claim 3 , wherein the substantially chamfered surface is substantially rounded.

6. The turbomachine bucket of claim 1 , wherein the flow interrupter is coupled to the leading edge of the base section by a weld.

7. A steam turbomachine comprising:
a diaphragm section including sets of nozzles extending radially inboard;
a rotor section substantially contained within the diaphragm section, the rotor section including:
a rotor body having a radially outer surface; and
sets of buckets extending radially from the radially outer surface of the rotor body and axially interspersed between adjacent sets of the nozzles of the diaphragm section, wherein at least one bucket in the sets of buckets includes:
a base section coupled to the rotor body, the base section having an axial facing leading edge and an axial facing trailing edge opposing the leading edge,
wherein the axial facing leading edge of the base section includes a planar surface;
a blade section coupled to the base section extending radially from the base section;
a shroud coupled to the blade section and extending radially from the blade section; and
a flow interrupter coupled to the leading edge of the base section,
wherein the flow interrupter extends from the leading edge of the base section to a weld joint between the blade section and the flow interrupter, and
wherein the flow interrupter includes a planar face extending from the planar surface of the leading edge of the base section such that the entire planar face of the flow interrupter is coplanar to the planar surface of the leading edge of the base section, and
wherein the flow interrupter has a substantially equal width as the blade section proximate the weld joint between the flow interrupter and the blade section, the width of the blade section and the width of the flow interrupter being measured along the leading edge of the base section.

8. The steam turbomachine of claim 7 , wherein the flow interrupter prevents leakage flow of a working fluid proximate a junction of the base section and the blade section.

9. The steam turbomachine of claim 7 , wherein the at least one bucket includes a pressure side extending between the leading edge and the trailing edge, and a suction side opposing the pressure side and extending between the leading edge and the trailing edge, wherein the flow interrupter affects a pressure differential between the pressure side and the suction side during operation of the steam turbomachine.

10. The steam turbomachine of claim 7 , wherein the flow interrupter includes a flange extending at least partially axially from the base section.

11. The steam turbomachine of claim 7 , wherein the leading edge of the base section includes a substantially chamfered surface proximate a joint between the base section and the blade section, and wherein the flow interrupter extends from the chamfered surface.

12. The steam turbomachine of claim 11 , wherein the planar surface of the leading edge of the base section is continuous with the substantially chamfered surface.

13. The steam turbomachine of claim 11 , wherein the substantially chamfered surface is substantially rounded.

14. The steam turbomachine of claim 7 , wherein the flow interrupter is coupled to the leading edge of the base section by a weld.

15. A turbomachine comprising:
a diaphragm section;
a rotor section substantially contained within the diaphragm section, the rotor section including:
a rotor body having a radially outer surface; and
sets of buckets extending radially from the radially outer surface of the rotor body, wherein at least one bucket in the sets of buckets includes:
a base section coupled to the rotor body, the base section having an axial facing leading edge and an axial facing trailing edge opposing the leading edge,
wherein the axial facing leading edge of the base section includes a planar surface;
a blade section coupled to the base section extending radially from the base section; and
a flow interrupter coupled to the leading edge of the base section,
wherein the flow interrupter has a width substantially equal to a width of the blade section proximate a joint between the flow interrupter and the blade section, and
wherein the flow interrupter includes a planar face extending from the planar surface of the leading edge of the base section such that the entire planar face of the flow interrupter is coplanar to the planar surface of the leading edge of the base section.

16. The turbomachine of claim 15 , wherein the flow interrupter is angled with respect to a radial axis of the rotor section at an angle between approximately 45 degrees and approximately 225 degrees.

17. The turbomachine of claim 15 , wherein the at least one bucket includes a pressure side extending between the leading edge and the trailing edge, and a suction side opposing the pressure side and extending between the leading edge and the trailing edge, wherein the flow interrupter affects a pressure differential between the pressure side and the suction side during operation of the steam turbomachine.

18. The turbomachine of claim 15 , wherein the flow interrupter is a single flow interrupter and wherein the flow interrupter extends from the leading edge of the base section to a weld joint between the blade section and the flow interrupter.

Assignees

• Gen Electric

Inventors

• Subramaniyan Moorthi
• Krishnan Prabakaran Modachur

Classifications

• F01D11/006

  Sealing the gap between rotor blades or blades and rotor · CPC title

• F01D11/02

  by non-contact sealings, e.g. of labyrinth type (for sealing space between rotor blade tips and stator F01D11/08) · CPC title

• F01D5/22 Primary

  Blade-to-blade connections, {e.g. for damping vibrations} · CPC title

• F01D11/001

  for sealing space between stator blade and rotor · CPC title

• F01D5/143 Primary

  Contour of the outer or inner working fluid flow path wall, i.e. shroud or hub contour · CPC title