权利要求：
Claims
1. A combustion chamber assembly comprising a combustion chamber and a plurality of nozzle guide vanes arranged at a downstream end of the combustion chamber, each nozzle guide vane comprising an inner platform, an outer platform and an aerofoil extending between the inner platform and the outer platform, the combustion chamber comprising an upstream end wall and at least one annular wall, the at least one annular wall comprising at least one box like structure, the at least one box like structure extending the full length of the combustion chamber, 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, the inner wall, the upstream end wall and the downstream end wall of the at least one box like structure comprising an integral structure, the interior of the box like structure being divided into at least two regions, the outer wall having a plurality of apertures for the supply of coolant into each of the at least two regions of the box like structure, the upstream end of the at least one box like structure having a plurality of apertures to supply coolant from a first upstream region of the interior of the box like structure and onto an inner surface of the inner wall to form a film of coolant, the first upstream region of the interior of the box like structure being configured to supply at least a portion of the coolant in an upstream direction to the plurality of apertures at the upstream end of the box like structure, the downstream end of the at least one box like structure having a plurality of apertures to supply coolant from a second downstream region of the interior of the box like structure and onto a surface of one of the inner platform and the outer platform to form a film of coolant, the second downstream region of the interior of the box like structure being configured to supply at least a portion of the coolant in a downstream direction to the plurality of apertures at the downstream end of the box like structure, the upstream end wall has a plurality of apertures to start a film of coolant on the inner surface of the inner wall and to draw coolant out of the first upstream region of the box like structure and the downstream end of the at least one box like structure has a second plurality of apertures to start a film of coolant onto a surface of one of the inner platform and the outer platform and to draw coolant out of
the second downstream region of the box like structure, the inlets of the second plurality of apertures are in the outer wall of the at least one box like structure.
2. A combustion chamber assembly as claimed in claim 1 wherein the plurality of apertures in the upstream end wall are circumferentially spaced apart.
3. A combustion chamber assembly as claimed in claim 2 wherein each aperture at the upstream end of the at least one box like structure is arranged circumferentially between two apertures in the upstream end wall.
4. A combustion chamber assembly as claimed in claim 1, claim 2 or claim 3 wherein each aperture at the upstream end of the at least one box like structure is aligned with an L shaped passage in the upstream end wall.
dS. A combustion chamber assembly as claimed in claim 5 wherein each L shaped passage has a portion arranged parallel to and at the same radius as the apertures in the upstream end wall.
6. A combustion chamber assembly as claimed in any of claims 1 to 5 wherein the plurality of second apertures at the downstream end of the at least one box like structure are circumferentially spaced apart.
/. A combustion chamber assembly as claimed in claim 6 wherein each aperture at the downstream end of the at least one box like structure is arranged circumferentially between two of the second plurality of apertures at the downstream end of the at least one box like structure.
8. A combustion chamber assembly as claimed in claim 1 wherein the at least one box like structure has at least one third region, the at least one third region being positioned between the first upstream region and the second downstream region, each third region having a dilution port, the inner wall of the at least one box like structure
having at least one passage adjacent the dilution port of each third region such that the flow of dilution air through the dilution port to draws coolant out of the at least one third region into the combustion chamber as additional mixing air.
9. A combustion chamber assembly as claimed in claim 8 wherein the at least one box like structure has a plurality of third regions, and each third region being positioned between the first upstream region and the second downstream region.
10. A combustion chamber assembly as claimed in claim 8 or claim 9 wherein each dilution port comprises a double wall chute, the double wall chute having at least one chamber defined between an inner wall and an outer wall, the at least one passage extending through the chamber between the inner and outer walls of the double wall chute.
11. A combustion chamber assembly as claimed in any of claims 1 to 10 wherein the interior of the at least one box like structure has walls to divide the interior into regions.
12. A combustion chamber assembly as claimed in claim 11 wherein the height of the interior of the box like structure in the first upstream region is greatest at the upstream end and the height of the interior of the box like structure in the second downstream region is greatest at the downstream end.
13. A combustion chamber assembly as claimed in claim 11 or claim 12 when dependent upon claim 8, claim 9 or claim 10 wherein the height of the interior of the box like structure in each third region is greatest adjacent the dilution port.
14. A combustion chamber assembly as claimed in claim 11 wherein each region has further walls to divide the region into ducts.
15. A combustion chamber assembly as claimed in claim 14 wherein the further walls extend axially, longitudinally within the first upstream region and the further walls extend axially, longitudinally, within the second downstream region.
16. A combustion chamber assembly as claimed in claim 14 or claim 15 when dependent upon claim 8, claim 9 or claim 10 wherein the dilution port is arranged at the centre of the respective third region and the further walls extend radially with respect to the dilution port within the third region.
17. A combustion chamber assembly as claimed in claim 15 wherein the cross- sectional area of each duct within the interior of the box like structure in the first upstream region is greatest at the upstream end and the cross-sectional area of each duct within the interior of the box like structure in the second downstream region is greatest at the downstream end.
18. A combustion chamber assembly as claimed in claim 16 wherein the cross- sectional area of each duct within the interior of the box like structure in each third region is greatest adjacent the dilution port.
19. A combustion chamber assembly as claimed in claim 12 or claim 17 wherein the number of apertures per unit length in the outer wall in the first upstream region decreases from the downstream end to the upstream end and the number of apertures per unit length in the outer wall in the second downstream region decreases from the upstream end to the downstream end.
20. A combustion chamber assembly as claimed in claim 13 or claim 18 wherein the number of apertures per unit length in the outer wall in each third region decreases towards the dilution port.
21. A combustion chamber assembly as claimed in any of claims 1 to 10 wherein a plurality of polyhedron shaped chambers are defined by a matrix of integral
interconnected walls, the polyhedron shaped chambers being arranged in at least two layers between the outer wall and the inner wall, at least some of the polyhedron shaped chambers in each layer being fluidly interconnected to the polyhedron shaped chambers in each adjacent layer by apertures extending through the integral interconnected walls of the polyhedron shaped chambers for the flow of coolant there- between, at least some of the polyhedron shaped chambers in the layer adjacent the inner wall being fluidly interconnected to define a plurality of ducts extending over the outer surface of the inner wall, the ducts in the first upstream region extending longitudinally to the plurality of apertures at the upstream end of the box like structure and the ducts in the second downstream region extending longitudinally to the plurality of apertures at the downstream end of the box like structure.
22. A combustion chamber assembly as claimed in any of claims 1 to 10 wherein a plurality of polyhedron shaped chambers being defined by a matrix of integral interconnected walls, the polyhedron shaped chambers being arranged in at least two layers between the outer wall and the inner wall, at least some of the polyhedron shaped chambers in each layer being fluidly interconnected to the polyhedron shaped chambers in each adjacent layer by apertures extending through the integral interconnected walls of the polyhedron shaped chambers for the flow of coolant there- between, at least some of the polyhedron shaped chambers in the layer remote from the inner wall being fluidly interconnected to define a plurality of ducts, the ducts in the first upstream region extending longitudinally to the plurality of apertures at the upstream end of the box like structure and the ducts in the second downstream region extending longitudinally to the plurality of apertures at the downstream end of the box like structure.
23. A combustion chamber assembly as claimed in claim 21 or claim 12 wherein the ducts in at least one third region extend to the at least one passage adjacent the dilution port.
24. A combustion chamber assembly as claimed in claim 24, claim 25 or claim 26 wherein the inner wall, the outer wall, the upstream end wall, the downstream end wall and the matrix of interconnected walls comprises a monolithic piece.
25. A combustion chamber assembly as claimed in claim 21, claim 22, claim 23 or claim 24 wherein the polyhedron shaped chambers are parallelogram sided cuboid shaped chambers, square based pyramid shaped chambers, rhombic dodecahedron shaped chambers, elongated dodecahedron shaped chambers, truncated dodecahedron shaped chambers, spherical shaped chambers, spheroid shaped chambers or two types of polyhedron shaped chambers.
26. A combustion chamber assembly as claimed in any of claims 1 to 25 wherein the at least one annular wall is manufactured by additive layer manufacture.
27. A combustion chamber assembly as claimed in any of claims 1 to 26 wherein the at least one annular wall is formed from a nickel base superalloy, a cobalt base superalloy or an iron base superalloy.
28. A combustion chamber assembly as claimed in any of claims 1 to 27 wherein the at least one annular wall comprises a plurality of box like structures, each box like structure is a combustion chamber segment.
29. A combustion chamber assembly as claimed in any of claims 1 to 28 wherein the combustion chamber is an annular combustion chamber and the annular combustion chamber comprises a radially inner annular wall and a radially outer annular wall.
30. A combustion chamber assembly as claimed in any of claims 1 to 28 wherein the at least one annular wall is a radially inner annular wall of an annular combustion chamber or the at least one annular wall is a radially outer annular wall of an annular combustion chamber.
31. A combustion chamber assembly as claimed in any of claims 1 to 28 wherein the combustion chamber is a tubular combustion chamber and the at least one annular wall is an annular wall of a tubular combustion chamber.
32. A combustion chamber assembly as claimed in any of claims 1 to 31 wherein the combustion chamber is a gas turbine engine combustion chamber.
33. 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 frame structure, the inner wall and the outer wall comprises a monolithic piece, the interior of the box like structure being divided into at least two regions, the outer wall having a plurality of apertures for the supply of coolant into each of the at least two regions of the box like structure, the upstream end of the at least one box like structure having a plurality of apertures to supply coolant from a first upstream region of the interior of the box like structure and onto an inner surface of the inner wall to form a film of coolant, the first upstream region of the interior of the box like structure being configured to supply at least a portion of the coolant in an upstream direction to the plurality of apertures at the upstream end of the box like structure, the downstream end of the at least one box like structure having a plurality of apertures to supply coolant from a second downstream region of the interior of the box like structure and onto a surface of one of the inner platform and the outer platform to form a film of coolant, the second downstream region of the interior of the box like structure being configured to supply at least a portion of the coolant in a downstream direction to the plurality of apertures at the downstream end of the box like structure.
34. A combustion chamber segment as claimed in claim 33 wherein the combustion chamber segment is formed from a nickel base superalloy, a cobalt base superalloy or an iron base superalloy.
35. A combustion chamber segment as claimed in claim 33 or claim 34 wherein the combustion chamber segment is manufactured by additive layer manufacture.
36. A combustion chamber segment as claimed in claim 33, claim 34 or claim 35 wherein the box like structure of the combustion chamber segment has a first end wall extending from a first end of the outer wall to a first end of the inner wall, a second end wall extending from a second, opposite, end of the outer wall to a second, opposite, end of the inner wall, a first edge wall extending from a first edge of the outer wall to a first edge of the inner wall, a second edge wall extending from a second, opposite, edge of the outer wall to a second, opposite, edge of the inner wall to form the box like structure.