Combustion chamber

Abstract

A combustion chamber arrangement includes an annular outer and inner walls including at least one row of tiles. Each tile in the row of tiles has a rail extending towards and sealing with the outer wall and lip extending in a downstream direction from the row of tiles. The outer wall has a row of apertures to direct coolant onto the lips of the row of tiles. Each tile has a fastener positioned upstream of the rail and the fastener extends through a corresponding mounting aperture to secure the tile to the outer wall. The rail of each tile defines a plurality of slots with the outer wall and the slots are arranged in a region downstream of the corresponding fastener. None of the apertures in the row of apertures are in a region downstream of the tiles fastener. The arrangement reduces crack generation and propagation in the outer wall.

1 . A combustion chamber arrangement comprising an annular outer wall and an annular inner wall spaced from the annular outer wall,
 the annular inner wall comprising at least one row of tiles, each row of tiles comprising a plurality of circumferentially arranged tiles, the downstream end of each tile in the at least one row of tiles having a rail extending from the downstream end of the tile towards and sealing with an inner surface of the annular outer wall and a lip extending in a downstream direction from the downstream end of the tile, the lips at the downstream ends of the tiles in the at least one row of tiles have outer surfaces,   the annular outer wall having at least one row of apertures to direct coolant onto the outer surfaces of the lips at the downstream ends of the tiles in the at least one row of tiles, the annular outer wall having a plurality of mounting apertures,   each tile in the at least one row of tiles having at least one fastener positioned upstream of the rail, the at least one fastener of each tile in the at least one row of tiles extending from the tile and through a corresponding mounting aperture in the annular outer wall to secure the tile to the annular outer wall,   the rail of at least one tile defining at least one slot with the inner surface of the annular outer wall, the at least one slot of the at least one tile being arranged in a region downstream of the at least one fastener and none of the apertures in the at least one row of apertures in the annular outer wall being arranged in the region downstream of the at least one fastener of the at least one tile.   
     
     
         2 . A combustion chamber arrangement as claimed in  claim 1  wherein the rail of the at least one tile defining a plurality of slots with the inner surface of the annular outer wall and the plurality of slots of the at least one tile being arranged in the region downstream of the at least one fastener. 
     
     
         3 . A combustion chamber arrangement as claimed in  claim 1  wherein the rail of each tile defining at least one slot with the inner surface of the annular outer wall, the at least one slot of each tile being arranged in a region downstream of the at least one fastener and none of the apertures in the at least one row of apertures being arranged in the region downstream of the at least one fastener of each tile. 
     
     
         4 . A combustion chamber arrangement as claimed in  claim 3  wherein the rail of each tile defining a plurality of slots with the inner surface of the annular outer wall and the plurality of slots of each tile being arranged in the region downstream of the at least one fastener. 
     
     
         5 . A combustion chamber arrangement as claimed in  claim 1  wherein each tile in the at least one row of tiles having a plurality of fasteners positioned upstream of the rail, each fastener extending from the tile and through a corresponding mounting aperture in the annular outer wall to secure the tile to the annular outer wall. 
     
     
         6 . A combustion chamber arrangement as claimed in  claim 1  wherein the rail of each tile in the at least one row of tiles defining a plurality of slots with the inner surface of the annular outer wall, at least one slot of each tile being arranged in a region downstream of each fastener and none of the apertures in the at least one row of apertures in the annular outer wall being arranged in the region downstream of each fastener of each tile. 
     
     
         7 . A combustion chamber arrangement as claimed in  claim 6  wherein a plurality of slots of each tile being arranged in a region downstream of each fastener. 
     
     
         8 . A combustion chamber arrangement as claimed in  claim 1  wherein the annular inner wall comprising an upstream row of tiles and a downstream row of tiles, the downstream end of each tile in the upstream row of tiles having a lip extending in a downstream direction towards but spaced from the upstream ends of the tiles in the downstream row of tiles, the annular outer wall having at least one row of apertures to direct coolant onto the outer surfaces of the lips at the downstream ends of the tiles in the upstream row of tiles, each tile in the upstream row of tiles having at least one fastener positioned upstream of the rail, the at least one fastener of each tile in the upstream row of tiles extending from the tile and through a corresponding mounting aperture in the annular outer wall to secure the tile to the annular outer wall, the rail of at least one tile defining at least one slot with the inner surface of the annular outer wall, the at least one slot of the at least one tile being arranged in a region downstream of the at least one fastener and none of the apertures in the at least one row of apertures in the annular outer wall being arranged in the region downstream of the at least one fastener of the at least one tile. 
     
     
         9 . A combustion chamber arrangement as claimed in  claim 8  wherein each tile in the upstream row of tiles having a plurality of fasteners positioned upstream of the rail, each fastener extending from the tile and through a corresponding mounting aperture in the annular outer wall to secure the tile to the annular outer wall. 
     
     
         10 . A combustion chamber arrangement as claimed in  claim 8  wherein the annular outer wall having a bend, the rail at the downstream end of each tile in the upstream row of tiles being arranged upstream of the bend in the annular outer wall. 
     
     
         11 . A combustion chamber arrangement as claimed in  claim 10  wherein the at least one row of apertures in the annular outer wall being arranged upstream of the bend in the annular outer wall and downstream of the rail at the downstream end of each tile in the upstream row of tiles. 
     
     
         12 . A combustion chamber arrangement as claimed in  claim 8  wherein the upstream end of each tile in the downstream row of tiles having a rail extending from the upstream end of the tile towards and sealing with an inner surface of the annular outer wall. 
     
     
         13 . A combustion chamber arrangement as claimed in  claim 1  wherein the annular outer wall having a bend, the rail at the downstream end of each tile in the at least one row of tiles being arranged upstream of the bend in the annular outer wall. 
     
     
         14 . A combustion chamber arrangement as claimed in  claim 13  wherein the at least one row of apertures in the annular outer wall being arranged upstream of the bend in the annular outer wall and downstream of the rail at the downstream end of each tile in the at least one row of tiles. 
     
     
         15 . A combustion chamber arrangement as claimed in  claim 1  wherein a plurality of slots being arranged in a region downstream of the at least one fastener, the region downstream of the at least one fastener having a circumferential dimension of up to four times the diameter of the at least one fastener. 
     
     
         16 . A combustion chamber arrangement as claimed in  claim 1  wherein the annular outer wall not having any apertures arranged in a region downstream of the at least one fastener, the region downstream of the at least one fastener having a circumferential dimension of up to four times the diameter of the at least one fastener. 
     
     
         17 . A combustion chamber arrangement as claimed in  claim 16  wherein the annular outer wall not having any apertures arranged in a region downstream of the at least one fastener, the region downstream of the at least one fastener having a circumferential dimension of up to twice the diameter of the at least one fastener. 
     
     
         18 . A combustion chamber arrangement as claimed in  claim 1  wherein the combustion chamber is an annular combustion chamber, the annular combustion chamber comprising a radially inner annular wall structure, a radially outer annular wall structure and an upstream end wall structure, the radially outer annular wall structure comprising the annular inner wall and the annular outer wall and the annular inner wall is spaced radially inwardly from the annular outer wall. 
     
     
         19 . A combustion chamber arrangement comprising an annular outer wall and an annular inner wall spaced from the annular outer wall,
 the annular inner wall comprising at least one row of tiles, each row of tiles comprising a plurality of circumferentially arranged tiles, the downstream end of each tile in the at least one row of tiles having a rail extending from the downstream end of the tile towards and sealing with an inner surface of the annular outer wall and a lip extending in a downstream direction from the downstream end of the tile, the lips at the downstream ends of the tiles in the at least one row of tiles have outer surfaces,   the annular outer wall having at least one row of apertures to direct coolant onto the outer surfaces of the lips at the downstream ends of the tiles in the at least one row of tiles, the annular outer wall having a plurality of mounting apertures,   each tile in the at least one row of tiles having at least one fastener positioned upstream of the rail, the at least one fastener of each tile in the at least one row of tiles extending from the tile and through a corresponding mounting aperture in the annular outer wall to secure the tile to the annular outer wall,   the rail of at least one tile defining a plurality of slots with the inner surface of the annular outer wall, the plurality of slots of the at least one tile being arranged in a region downstream of the at least one fastener of the at least one tile, the annular outer wall not having any apertures arranged in the region downstream of the at least one fastener of the at least one tile and the region downstream of the at least one fastener having a circumferential dimension of up to four times the diameter of the at least one fastener.   
     
     
         20 . A combustion chamber arrangement comprising an annular outer wall and an annular inner wall spaced from the annular outer wall,
 the annular outer wall having a bend and a plurality of mounting apertures,   the annular inner wall comprising at least one row of tiles, each row of tiles comprising a plurality of circumferentially arranged tiles, the downstream end of each tile in the at least one row of tiles having a rail extending from the downstream end of the tile towards and sealing with an inner surface of the annular outer wall and a lip extending in a downstream direction from the downstream end of the tile, the lips at the downstream ends of the tiles in the at least one row of tiles have outer surfaces, the rail at the downstream end of each tile in the at least one row of tiles being arranged upstream of the bend in the annular outer wall,   the annular outer wall having at least one row of apertures to direct coolant onto the outer surfaces of the lips at the downstream ends of the tiles in the at least one row of tiles, the at least one row of apertures in the annular outer wall being arranged upstream of the bend in the annular outer wall and downstream of the rail at the downstream end of each tile in the at least one row of tiles,   each tile in the at least one row of tiles having at least one fastener positioned upstream of the rail, the at least one fastener of each tile in the at least one row of tiles extending from the tile and through a corresponding mounting aperture in the annular outer wall to secure the tile to the annular outer wall,   the rail of at least one tile defining a plurality of slots with the inner surface of the annular outer wall, the plurality of slots of the at least one tile being arranged in a region downstream of the at least one fastener of the at least one tile, the annular outer wall being imperforate in the region downstream of the at least one fastener of the at least one tile, the annular outer wall not having any apertures arranged in the region downstream of the at least one fastener of the at least one tile and the region downstream of the at least one fastener having a circumferential dimension of up to four times the diameter of the at least one fastener.