Combustor with axially staged fuel injector assembly

Patent metadata

Field	Value
Publication number	US-2018209651-A1
Application number	US-201715411264-A
Country	US
Kind code	A1
Filing date	Jan 20, 2017
Priority date	Jan 20, 2017
Publication date	Jul 26, 2018
Grant date	—

Abstract

A fuel injector assembly for a combustor including an axially staged fuel injector includes an injector body having an inner wall and a boss that is rigidly connected to the injector body the boss includes an inner wall. The inner wall of the boss and the inner wall of the injector body together define a flow passage of the fuel injector assembly. The injector body defines an inlet to the flow passage and the boss defines an outlet of the flow passage.

First claim

What is claimed is:

1 . A fuel injector assembly, comprising:
an injector body having an inner wall; a boss rigidly connected to the injector body and including an inner wall, wherein the inner wall of the boss and the inner wall of the injector body together define a flow passage of the fuel injector assembly, wherein the injector body defines an inlet to the flow passage and the boss defines an outlet of the flow passage.

2 . The fuel injector assembly as in claim 1 , further comprising a purge air manifold, an inlet defined by the injector body and in fluid communication with the purge air manifold and a plurality of circumferentially spaced outlets in fluid communication with the purge air manifold, wherein at least one outlet of the plurality of outlets is disposed at or upstream from a joint defined between the inner wall of the injector body and the inner wall of the boss.

3 . The fuel injector assembly as in claim 2 , wherein the purge air manifold is at least partially defined by the injector body.

4 . The fuel injector assembly as in claim 2 , wherein the purge air manifold is defined between a mating surface of the injector body and a mating surface of the boss.

5 . The fuel injector assembly as in claim 1 , wherein the inner wall of the boss converges inwardly with respect to a centerline of the fuel injector assembly between a joint defined between the inner wall of the injector body and the inner wall of the boss and the outlet from the flow passage defined by the boss.

6 . The fuel injector assembly as in claim 1 , further comprising a centerbody that extends coaxially within the flow passage.

7 . The fuel injector assembly as in claim 6 , further comprising a plurality of circumferentially spaced turning vanes that extends from the centerbody to the inner wall of the injector body.

8 . The fuel injector assembly as in claim 7 , wherein the injector body defines a fuel plenum between the inner wall and an outer wall of the injector body, wherein one or turning vanes of the plurality of turning vanes is in fluid communication with the fuel plenum.

9 . The fuel injector assembly as in claim 1 , wherein the injector body is connected to the boss via a mechanical fastener.

10 . A combustor, comprising:
a combustion liner defining a hot gas path and first radial opening; a fuel injector assembly including an injector body having an inner wall and a boss including an inner wall, wherein an upstream end of the boss is rigidly connected to the injector body and wherein a downstream end of the boss is connected to the combustion liner, wherein the inner wall of the boss and the inner wall of the injector body together define a flow passage of the fuel injector assembly, wherein the flow passage is in fluid communication with the hot gas path via the first radial opening.

11 . The combustor as in claim 10 , wherein the injector body defines an inlet to the flow passage and the boss defines an outlet of the flow passage.

12 . The combustor as in claim 10 , wherein the fuel injector assembly further comprises a purge air manifold, an inlet defined by the injector body and in fluid communication with the purge air manifold and a plurality of circumferentially spaced outlets in fluid communication with the purge air manifold, wherein at least one outlet of the plurality of outlets is disposed at or upstream from a joint defined between the inner wall of the injector body and the inner wall of the boss.

13 . The combustor as in claim 12 , wherein the purge air manifold is at least partially defined by the injector body.

14 . The combustor as in claim 12 , wherein the purge air manifold is defined between a mating surface of the injector body and a mating surface of the boss.

15 . The combustor as in claim 10 , wherein the inner wall of the boss converges inwardly with respect to a centerline of the fuel injector assembly between a joint defined between the inner wall of the injector body and the inner wall of the boss and the outlet from the flow passage defined by the boss.

16 . The combustor as in claim 10 , wherein the fuel injector assembly further comprises a centerbody that extends coaxially within the flow passage.

17 . The combustor as in claim 16 , wherein the fuel injector assembly further comprises a plurality of circumferentially spaced turning vanes that extends from the centerbody to the inner wall of the injector body.

18 . The combustor as in claim 17 , wherein the injector body defines a fuel plenum between the inner wall and an outer wall of the injector body, wherein one or turning vanes of the plurality of turning vanes is in fluid communication with the fuel plenum.

19 . The combustor as in claim 10 , further comprising an outer sleeve defining a second radial opening, the outer sleeve at least partially surrounding the combustion liner, wherein the outer sleeve is radially spaced from the combustion liner so as to define a cooling flow passage therebetween, wherein the fuel injector assembly extends radially through the second radial opening.

Assignees

• Gen Electric

Inventors

• Cai Jun
• Cihlar David William
• Karim Hasan

Classifications

• F23K2300/203

  Purging · CPC title

• F23R3/346

  for staged combustion · CPC title

• F23R3/286

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

• F23R2900/03042

  Film cooled combustion chamber walls or domes · CPC title

• F23R3/283 Primary

  Attaching or cooling of fuel injecting means including supports for fuel injectors, stems, or lances · CPC title