Combustion chamber having an annular outer wall with a concave bend

Patent metadata

Field	Value
Publication number	US-10344977-B2
Application number	US-201715421030-A
Country	US
Kind code	B2
Filing date	Jan 31, 2017
Priority date	Feb 24, 2016
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A combustion chamber arrangement has an annular outer wall and an annular inner wall having an upstream row of tiles and a downstream row of tiles. The outer wall has a concave bend which is less than 175°. The downstream end of the upstream tiles and the upstream end of the downstream tiles are adjacent the concave bend. The downstream ends of the upstream tiles are spaced at a greater distance from the inner surface of the annular outer wall than the upstream end of the downstream tiles. The upstream tiles have curved lips extending in a downstream direction which overlap but are spaced radially from the upstream ends of the downstream tiles. The outer wall has a row of apertures to direct coolant onto the outer surfaces of the curved lips and the upstream tiles has a row of apertures extending to the inner surfaces of the curved lips.

First claim

The invention claimed is:

1. A combustion chamber arrangement comprising an annular outer wall and an annular inner wall spaced from the annular outer wall,
the annular outer wall being curved in a plane perpendicular to the axis of the combustion chamber, the annular outer wall having an upstream portion and a downstream portion, the annular outer wall having a concave bend in a plane containing the axis of the combustion chamber, the plane containing the axis of the combustion chamber having a straight line which is co-linear with the axis of the combustion chamber, the concave bend being arranged between and connecting the upstream portion and the downstream portion of the annular outer wall, the downstream portion of the annular outer wall being arranged at an angle to the upstream portion of the annular outer wall by the concave bend, the concave bend is less than 175°,
the annular inner wall comprising an upstream row of tiles and a downstream row of tiles, each row of tiles comprises a plurality of circumferentially arranged tiles, the downstream end of each tile in the upstream row of tiles is adjacent the concave bend and the upstream end of each tile in the downstream row of tiles is adjacent the concave bend, the upstream end of each tile in the downstream row of tiles has a rail extending from the upstream end of the tile towards and sealing with an inner surface of the downstream portion of the annular outer wall downstream of the concave bend, the downstream end of each tile in the upstream row of tiles has a rail extending from the downstream end of the tile towards and sealing with the inner surface of the upstream portion of the annular outer wall upstream of the concave bend, the downstream end of each tile in the upstream row of tiles is spaced at a greater distance from the inner surface of the annular outer wall than the upstream end of each tile in the downstream row of tiles, each tile in the upstream row of tiles has a curved lip extending in a downstream direction which overlaps the upstream ends of the tiles in the downstream row of tiles and is spaced radially from the upstream ends of the tiles in the downstream row of tiles and the annular outer wall has at least one row of apertures to direct coolant onto outer surfaces of the curved lips at the downstream ends of the tiles in the upstream row of tiles.

2. The combustion chamber as claimed in claim 1 wherein each tile in the upstream row of tiles has at least one row of apertures extending there-through to an inner surface of the curved lip at the downstream end of the tile.

3. The combustion chamber as claimed in claim 2 wherein the at least one row of apertures of the upstream row of tiles extends from an outer surface of a main body of the tile to the inner surface of the curved lip at the downstream end of the tile.

4. The combustion chamber as claimed in claim 2 wherein the at least one row of apertures of the upstream row of tiles extends from an upstream surface of the rail through the rail to the inner surface of the curved lip at the downstream end of the tile.

5. The combustion chamber as claimed in claim 4 wherein the at least one row of apertures in each tile of the upstream row of tiles extends through the tile at a junction between a main body of the tile, the rail and the curved lip.

6. The combustion chamber as claimed in claim 2 wherein the apertures in the at least one row of apertures in each tile of the upstream row of tiles are arranged at an angle of 15° to 30° to the inner surface of the curved lip of the respective tile.

7. The combustion chamber as claimed in claim 1 wherein the upstream row of tiles has at least one row of apertures extending from an outer surface of a main body of the tile to an inner surface of the main body of the tile.

8. The combustion chamber as claimed in claim 7 wherein each aperture in the at least one row of apertures in each tile of the upstream row of tiles is arranged at an angle of 15° to 30° to the inner surface of the respective tile.

9. The combustion chamber as claimed in claim 1 wherein a downstream surface of the rail of each tile of the upstream row of tiles and the outer surface of the curved lip of each tile of the upstream row of tiles form a smoothly curved surface.

10. The combustion chamber as claimed in claim 1 wherein the inner surface of the curved lip of each tile of the upstream row of tiles form a smoothly curved surface.

11. The combustion chamber as claimed in claim 1 wherein each tile in the downstream row of tiles has a curved lip extending towards the annular outer wall.

12. The combustion chamber as claimed in claim 11 wherein the curved lips on the upstream row of tiles and the curved lips on the downstream row of tiles define an annular duct converging in a downstream direction.

13. The combustion chamber as claimed in claim 1 wherein each tile in the upstream row of tiles comprises a main body, a rail at its upstream end, the rail at its downstream end, the curved lip at its downstream end and the curved lip curves away from the annular outer wall.

14. The combustion chamber as claimed in claim 11 wherein each tile in the downstream row of tiles comprises a main body, the rail at its upstream end, a rail at its downstream end, a curved lip at its upstream end and the curved lip curves towards the annular outer wall.

15. The combustion chamber as claimed in claim 1 wherein the outer surface of the downstream ends of the lips at the downstream ends of the upstream row of tiles are arranged parallel to the inner surface of the tiles in the downstream row of tiles.

16. The combustion chamber as claimed in claim 1 wherein the downstream end of each tile in the upstream row of tiles is spaced at a greater distance from the inner surface of the annular outer wall than the upstream end of each tile in the upstream row of tiles.

17. The combustion chamber as claimed in claim 1 wherein the downstream end of each tile in the upstream row of tiles and the upstream end of each tile in the upstream row of tiles are spaced at the same distance from the inner surface of the annular outer wall.

18. The combustion chamber as claimed in claim 1 wherein the downstream end of each tile in the downstream row of tiles and the upstream end of each tile in the downstream row of tiles are spaced at the same distance from the inner surface of the annular outer wall.

19. The combustion chamber as claimed in claim 1 wherein the at least one row of apertures in the annular outer wall is arranged to supply the coolant to a chamber defined between the inner surface of the annular outer wall, the rails and the curved lips of the downstream ends of the tiles in the upstream row of tiles and the rails of the upstream ends of the downstream row of tiles.

20. The combustion chamber as claimed in claim 1 wherein the at least one row of apertures in the annular outer wall is arranged to supply the coolant to a chamber defined between the inner surface of the annular outer wall, the rails and the curved lips of the downstream ends of the tiles in the upstream row of tiles and the rails and the curved lips of the upstream ends of the downstream row of tiles.

21. The combustion chamber as claimed in claim 1 wherein the combustion chamber is an annular combustion chamber and the annular outer wall is an annular radially outer wall of the annular combustion chamber and the annular inner wall is spaced radially within the annular radially outer wall.

22. The c

Assignees

• Rolls Royce Plc

Inventors

• Mulcaire Thomas G
• Hicks Robert A
• Foale Marcus

Classifications

• F23R3/007

  constructed mainly of ceramic components · CPC title

• F23R2900/03044

  Impingement cooled combustion chamber walls or subassemblies · CPC title

• F23R3/06

  Arrangement of apertures along the flame tube · CPC title

• F23R2900/03042

  Film cooled combustion chamber walls or domes · CPC title

• F23R3/002 Primary

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