Combustion chamber and a combustion chamber segment

Patent metadata

Field	Value
Publication number	US-10634350-B2
Application number	US-201615217142-A
Country	US
Kind code	B2
Filing date	Jul 22, 2016
Priority date	Aug 13, 2015
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

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

The invention claimed is:

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 shaped structure, the at least one box shaped 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 at least one box shaped structure, the inner wall, the outer wall, the upstream end wall and the downstream end wall being a unitary structure formed by additive layer manufacturing,
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 a full thickness of the inner wall to accommodate differential thermal expansion between the inner wall and the outer wall,
wherein at least one of surfaces of the at least one slot is arranged at an angle of up to 60° to a surface of the inner wall,
wherein the at least one annular wall has a plurality of circumferentially spaced dilution apertures extending there-through and each of the at least one slot extending between and interconnecting two adjacent dilution apertures,
wherein the each of the at least one slot extends with axial and circumferential components between the two adjacent dilution apertures,
wherein the each of the at least one slot comprises a first portion extending with the axial and the circumferential components from a first dilution aperture and a second portion extending with axial and circumferential components from the first portion to a second dilution aperture, the first dilution aperture and the second dilution aperture being the two adjacent dilution apertures and
wherein the each of the at least one slot is located between the two adjacent dilution apertures, extends sinusoidally, and is arranged in any direction between the two adjacent dilution apertures.

2. The 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 a full length of the at least one annular wall, the each combustion chamber segment comprising a box shaped structure, the box shaped 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 shaped structure, the frame structure, the inner wall and the outer wall being integral,
an upstream end of the each combustion chamber segment having features to secure the combustion chamber segment to the upstream ring structure and a downstream end of the each combustion chamber segment having features to mount the combustion chamber segment on the downstream ring structure,
the inner wall of the each combustion chamber segment having at least one slot extending through a full thickness of the inner wall to accommodate differential thermal expansion between the inner wall and the outer wall.

3. The combustion chamber as claimed in claim 1 wherein the at least one slot includes 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. The combustion chamber as claimed in claim 3 wherein the plurality of slots and the plurality of circumferentially spaced dilution apertures are 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.

5. The combustion chamber as claimed in claim 1 wherein the at least one slot is 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.

6. The combustion chamber as claimed in claim 1 wherein the at least one of the surfaces of the at least one slot is arranged at the angle of between 10° and 30° to the surface of the inner wall.

7. The combustion chamber as claimed in claim 1 wherein both surfaces of the at least one slot are arranged at the angle of 10° to 60° to the surface of the inner wall.

8. The combustion chamber as claimed in claim 7 wherein the both surfaces of the at least one slot are arranged at the angle of between 10° and 30° to the surface of the inner wall.

9. The combustion chamber as claimed in claim 7 wherein the both surfaces of the at least one slot are parallel.

10. The combustion chamber as claimed in claim 9 wherein the at least one slot is defined between a downstream portion and an upstream portion of the inner wall, the at least one slot defined between two parallel surfaces, the two parallel surfaces arranged on the upstream portion and the downstream portion of the inner wall, the two parallel surfaces 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 at least one slot intersecting the inner surface of the inner wall at a position downstream of the position at which the at least one slot intersects the outer surface of the inner wall.

11. The combustion chamber as claimed in claim 10 wherein a downstream end of the upstream portion has 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 an upstream end of the downstream portion has 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.

12. The combustion chamber as claimed in claim 1 wherein a downstream end of an upstream portion of the inner wall has a first surface portion extending perpendicularly from the inner surface of the inner wall, a second portion extending parallel to the inner surface and an outer surface of the inner wall and a third portion extending perpendicularly to the outer surface of the inner wall, and a upstream end of an downstream portion of the inner wall has 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.

13. The combustion chamber as claimed in claim 1 wherein a plurality of members are secured to and interconnect an outer surface of the inner wall and an inner surface of the outer wall.

14. The combustion chamber as claimed in claim 1 wherein the inner wall has a plurality of inner wall apertures each having at least one surface angled with respect to the surface of the inner wall, the at least one slot disposed between at least two of the plurality of inner wall apertures,
wherein the at least one of the surfaces of the at least one slot is arranged at the angle of 10° to 60° to the surface of the inner wall, the angle of the at least one of the surfaces of the at least one slot being different than the angle of the at least one surface of the each of the plurality of inner wall apertures.

15. A combustion chamber segment, the combustion chamber segment extending a full length of the combustion chamber, the combustion chamber segment comprising a box shaped structure, the box shaped structure comprising a frame

Assignees

• Rolls Royce Plc

Inventors

• Harding Stephen C
• Hucker Paul A
• Rallo Giuseppe

Classifications

• F05D2220/32

  in gas turbines · CPC title

• F23R2900/03044

  Impingement cooled combustion chamber walls or subassemblies · CPC title

• F23R2900/03041

  Effusion cooled combustion chamber walls or domes · CPC title

• F23R3/002 Primary

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

• F02C3/04

  having a turbine driving a compressor (power transmission arrangements F02C7/36; control of working fluid flow F02C9/16) · CPC title