Vortex generating arrangement for a pre-mixing burner of a gas turbine and gas turbine with such vortex generating arrangement

Patent metadata

Field	Value
Publication number	US-10473333-B2
Application number	US-201615098009-A
Country	US
Kind code	B2
Filing date	Apr 13, 2016
Priority date	Apr 13, 2015
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

The invention proposes a vortex generating arrangement, especially for a pre-mixing burner of a gas turbine, having an air conducting channel of predetermined height extending between two essentially parallel channel walls and having a predetermined direction of air flow, and having a plurality of vortex generators arranged in the channel. An improved mixing is achieved by the vortex generators each having the shape of a triangular plate, which is arranged essentially perpendicular to the channel walls and oriented relative to the direction of air flow with a predetermined off-axis angle ≠0°, and a first side of the triangular plate being oriented perpendicular to the channel walls.

First claim

The invention claimed is:

1. A vortex generating arrangement, for a pre-mixing burner of a gas turbine, comprising:
an air conducting channel of predetermined height extending between two essentially parallel channel walls and having a predetermined direction of air flow; and
a plurality of vortex generators arranged in said channel also having the predetermined height and extending between the two essentially parallel channel walls, wherein:
said vortex generators each having a shape of a triangular plate, arranged essentially perpendicular to said channel walls and oriented relative to said direction of air flow with a predetermined off-axis angle (α, β) ≠0°, and a first side of said triangular plate is oriented perpendicular to said channel walls, each of said vortex generators configured to form only a single vortex, and wherein a gap exists between each of the plurality of vortex generators from one wall to another wall of the two essentially parallel channel walls.

2. The vortex generating arrangement as claimed in claim 1 , wherein said vortex generators are individually arranged in said channel.

3. The vortex generating arrangement as claimed in claim 1 ,
wherein said vortex generators are arranged in said channel in groups.

4. The vortex generating arrangement as claimed in claim 1 ,
wherein each of said first side of the triangular plate is arranged upstream with respect to said direction of air flow, thereby being a leading edge of a respective one of the plurality of vortex generators.

5. The vortex generating arrangement as claimed in claim 1 ,
wherein each of said first side of the triangular plate is arranged downstream with respect to said direction of air flow, thereby being a trailing edge of a respective one of the plurality of vortex generators.

6. The vortex generating arrangement as claimed in claim 1 ,
wherein said plurality of vortex generators each have a shape of a right-angled triangular plate, and that said first side is a leg of said right-angled triangular plate.

7. The vortex generating arrangement as claimed in claim 1 ,
wherein all of the plurality of vortex generators of said arrangement have a same orientation with respect to said direction of air flow.

8. The vortex generating arrangement as claimed in claim 1 ,
wherein the plurality of vortex generators of said arrangement have different orientations with respect to said direction of air flow.

9. The vortex generating arrangement as claimed in claim 8 ,
wherein the plurality of vortex generators of said arrangement have two different orientations with respect to said direction of air flow with a positive and a negative predetermined off-axis angle.

10. The vortex generating arrangement as claimed in claim 1 ,
comprising an injector for injecting a fuel into an air stream passing said vortex generators is provided at said vortex generators.

11. The vortex generating arrangement as claimed in claim 10 ,
wherein said injector is positioned at a specific injector location at said vortex generators.

12. The vortex generating arrangement as claimed in claim 11 ,
wherein said specific injector location is located at a trailing edge of said vortex generators.

13. The vortex generating arrangement as claimed in claim 11 ,
wherein said specific injector location is located at a leading edge of said vortex generators.

14. A gas turbine with a premixing burner comprising:
the vortex generating arrangement, wherein said vortex generating arrangement is an arrangement according to claim 1 .

15. The vortex generating arrangement as claimed in claim 1 ,
wherein said first side of each said triangular plate is arranged upstream with respect to said direction of air flow, thereby being a leading edge of a respective one of the plurality of vortex generators, wherein at least one first vortex generator of the plurality of vortex generators is configured to impart a co-rotating vortex and at least one second vortex generator of the plurality of vortex generators is configured to impart a counter-rotating vortice.

Assignees

• Ansaldo Energia Switzerland AG

Inventors

• Yang Yang
• Düsing Michael

Classifications

• F23R2900/03341

  Sequential combustion chambers or burners · CPC title

• F23R3/18

  Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants · CPC title

• F23R3/286 Primary

  having fuel-air premixing devices (F23R3/30 takes precedence) · CPC title

• F23R3/12 Primary

  inducing a vortex · CPC title

• F23R3/38

  comprising rotary fuel injection means · CPC title