Combustion chamber and a combustion chamber segment

Patent metadata

Field	Value
Publication number	US-2017045227-A1
Application number	US-201615217142-A
Country	US
Kind code	A1
Filing date	Jul 22, 2016
Priority date	Aug 13, 2015
Publication date	Feb 16, 2017
Grant date	—

Abstract

A combustion chamber includes at least one annular wall which includes at least one box like structure and each box like structure includes an inner wall, outer wall, upstream end wall and downstream end wall. The inner wall is spaced radially from the outer wall and the outer wall has a plurality of apertures for the supply of coolant into the box like structure. The inner wall, the outer wall, the upstream end wall and the downstream end wall are integral. The upstream end of the annular wall has features to secure the annular wall to an upstream ring structure and a downstream end of the annular wall has features to mount the annular wall on a downstream ring structure. The inner wall has at least one slot extending through the full thickness of the inner wall to accommodate differential thermal expansion between the inner wall and the outer wall.

First claim

1 . A combustion chamber comprising at least one annular wall, an upstream ring structure and a downstream ring structure,
the at least one annular wall comprising at least one box like structure, the at least one box like structure comprising an inner wall, an outer wall, an upstream end wall and a downstream end wall, the inner wall being spaced radially from the outer wall, the outer wall having a plurality of apertures for the supply of coolant into the box like structure, the inner wall, the outer wall, the upstream end wall and the downstream end wall being integral, an upstream end of the at least one annular wall having features to secure the at least one annular wall to the upstream ring structure and a downstream end of the at least one annular wall having features to mount the at least one annular wall on the downstream ring structure, the inner wall having at least one slot extending through the full thickness of the inner wall to accommodate differential thermal expansion between the inner wall and the outer wall.

2 . A combustion chamber as claimed in claim 1 wherein the at least one annular wall comprising a plurality of combustion chamber segments,
each combustion chamber segment extending the full length of the at least one annular wall, each combustion chamber segment comprising a box like structure, the box like structure comprising a frame structure, an inner wall and an outer wall, the inner wall being spaced radially from the outer wall, the outer wall having a plurality of apertures for the supply of coolant into the box like structure, the frame structure, the inner wall and the outer wall being integral,
the upstream end of each combustion chamber segment having features to secure the combustion chamber segment to the upstream ring structure and the downstream end of each combustion chamber segment having features to mount the combustion chamber segment on the downstream ring structure,
the inner wall of each combustion chamber segment having at least one slot extending through the full thickness of the inner wall to accommodate differential thermal expansion between the inner wall and the outer wall.

3 . A combustion chamber as claimed in claim 1 wherein the inner wall having a plurality of slots extending through the full thickness of the inner wall to accommodate differential thermal expansion between the inner wall and the outer wall.

4 . A combustion chamber as claimed in claim 1 wherein the at least one annular wall having a plurality of circumferentially spaced dilution apertures extending there-through and each slot extending between two adjacent dilution apertures.

5 . A combustion chamber as claimed in claim 4 wherein each slot extending with axial and circumferential components between the two adjacent dilution apertures.

6 . A combustion chamber as claimed in claim 5 wherein each slot comprising a first portion extending with axial and circumferential components from the first dilution aperture and a second portion extending with axial and circumferential components from the first portion to the second dilution aperture.

7 . A combustion chamber as claimed in claim 6 wherein each slot extending sinusoidally between the two adjacent dilution apertures.

8 . A combustion chamber as claimed in claim 3 wherein the plurality of slots and dilution apertures being arranged to form a loop extending through the full thickness of the inner wall to accommodate differential thermal expansion between the inner wall and the outer wall.

9 . A combustion chamber as claimed in claim 1 wherein the slot being arranged to form a loop extending through the full thickness of the inner wall to accommodate differential thermal expansion between the inner wall and the outer wall.

10 . A combustion chamber as claimed in claim 1 wherein at least one of the surfaces of the at least one slot being arranged at an angle of up to 60° to the surface of the inner wall.

11 . A combustion chamber as claimed in claim 10 wherein the at least one surface of the at least one slot being arranged at an angle of between 10° and 30° to the surface of the inner wall.

12 . A combustion chamber as claimed in claim 10 wherein both surfaces of the at least one slot being arranged at an angle of up to 60° to the surface of the inner wall.

13 . A combustion chamber as claimed in claim 12 wherein both surfaces of the at least one slot being arranged at an angle of between 10° and 30° to the surface of the inner wall.

14 . A combustion chamber as claimed in claim 12 wherein both surfaces of the at least one slot being arranged at an angle of 25° to the surface of the inner wall.

15 . A combustion chamber as claimed in claim 12 wherein the surfaces of the slot being parallel.

16 . A combustion chamber as claimed in claim 15 wherein the slot being defined between a downstream portion and an upstream portion of the inner wall, the slot being defined between two parallel surfaces, the parallel surfaces being arranged on the upstream portion and the downstream portion of the inner wall, the surfaces being arranged at an angle to the inner surface of the inner wall and at an angle to the outer surface of the inner wall, the slot intersecting the inner surface of the inner wall at a position downstream of the position at which the slot intersects the outer surface of the inner wall.

17 . A combustion chamber as claimed in claim 16 wherein the downstream end of the upstream portion having a surface being arranged at an angle to the inner surface of the inner wall and at an angle to the outer surface of the inner wall and the upstream end of the downstream portion having a surface arranged at an angle to the inner surface of the inner wall and at an angle to the outer surface of the inner wall.

18 . A combustion chamber as claimed in claim 10 wherein the downstream end of the upstream portion having a first surface portion extending perpendicularly from the inner surface of the inner wall, a second portion extending parallel to the inner surface and the outer surface of the inner wall and a third portion extending perpendicularly to the outer surface of the inner wall, the upstream end of the downstream portion having a first portion extending at an angle to the inner surface of the inner wall, a second portion extending parallel to the inner surface and the outer surface of the inner wall and a third portion extending perpendicularly to the outer surface of the inner wall.

19 . A combustion chamber as claimed in claim 1 wherein a plurality of members being secured to and interconnecting the inner wall and the outer wall.

20 . A combustion chamber segment, the combustion chamber segment extending the full length of the combustion chamber, the combustion chamber segment comprising a box like structure, the box like structure comprising a frame structure, an inner wall and an outer wall, the inner wall being spaced from the outer wall, the outer wall having a plurality of apertures for the supply of coolant into the box like structure, the frame structure, the inner wall and the outer wall being integral,
the upstream end of the combustion chamber segment having features to secure the combustion chamber segment to an upstream ring structure and a downstream end of the combustion chamber segment having features to mount the combustion chamber segment on a downstream ring structure, the inner wall having at least one slot extending through the full thickness of the inner wall to accommodate differential thermal ex

Assignees

• Rolls Royce Plc

Inventors

• Harding Stephen C
• Hucker Paul A
• Rallo Giuseppe

Classifications

• F23R2900/00005

  Preventing fatigue failures or reducing mechanical stress in gas turbine components · CPC title

• F23R3/002 Primary

  Wall structures (F23R3/02 and F23R3/007 take precedence) · CPC title

• F23R2900/03041

  Effusion cooled combustion chamber walls or domes · CPC title

• F23R3/50

  Combustion chambers comprising an annular flame tube within an annular casing (toroidal combustion chambers F23R3/52) · CPC title

• F23R2900/03044

  Impingement cooled combustion chamber walls or subassemblies · CPC title