Double wall combustor tile arrangement

Abstract

A double wall structure ( 22 ) for a combustor ( 15 ) of a gas turbine engine ( 10 ) comprising an inner wall ( 28 ) and an outer wall ( 27 ), the inner wall ( 28 ) comprising a plurality of main tiles ( 50 ), the main tiles ( 50 ) are secured to the outer wall ( 27 ) by a securing means ( 35 ), wherein the inner wall ( 28 ) further comprises a plurality of edge tiles ( 52 ) which are secured to the outer wall ( 27 ) by securing means ( 35 ), each edge tile ( 52 ) overlapping at least one edge ( 30, 31, 54, 61 ) of a main tile ( 50 ) thereby further securing the main tiles ( 50 ) to the outer wall ( 27 ).

We claim:  
     
         1 . A double wall structure for a combustor of a gas turbine engine comprising an inner wall and an outer wall, the inner wall comprising a plurality of main tiles, the main tiles are secured to the outer wall by a securing means, wherein the inner wall further comprises a plurality of edge tiles which are secured to the outer wall by securing means, each edge tile overlapping at least one edge of a main tile thereby further securing the main tiles to the outer wall.  
     
     
         2 . A double wall structure as claimed in  claim 1  wherein the edge of the main tile comprises a stepped edge having a leg portion extending from the main tile towards the outer wall and a foot portion extending from a distal end of the leg portion, the edge is arranged to space apart the main tile from the outer wall, the foot portion being in slideable contact with the outer wall and the overlapping edge tile.  
     
     
         3 . A double wall structure as claimed in  claim 1  wherein the edge of the main tile comprises a leg portion extending from the main tile towards the outer wall, the edge is arranged to space apart the main tile from the outer wall, the leg portion having a distal end in slideable contact with the outer wall, the overlapping edge tile being in slideable contact with the edge.  
     
     
         4 . A double wall structure as claimed in  claim 1  wherein the securing means is a stud, the stud comprises a threaded plug and a nut, in use the threaded plug is secured to the tile and extends through a hole defined in the outer wall and onto which the nut is fastened.  
     
     
         5 . A double wall structure as claimed in  claim 4  wherein the threaded plug of the stud further comprises a thickened portion, the thickened portion is disposed between the tile and the outer wall and defines the space therebetween.  
     
     
         6 . A double wall structure as claimed in  claim 1  wherein the edge tile overlaps adjacent edges of adjacent main tiles, the edges being generally aligned with a principal axis of the engine.  
     
     
         7 . A double wall structure as claimed in  claim 1  wherein the edge tile overlaps adjacent edges of adjacent main tiles, the edges being generally circumferentially aligned with respect to a principal axis of the engine.  
     
     
         8 . A double wall structure as claimed in  claim 1  wherein the edge tile overlaps adjacent edges of adjacent main tiles, the edges being generally axially aligned with a principal axis of the engine and the edges being generally circumferentially aligned to the principal axis.  
     
     
         9 . A double wall structure as claimed in  claim 1  wherein the edge tile comprises a plurality of angled effusion cooling holes.  
     
     
         10 . A double wall structure as claimed in  claim 1  wherein the edge tile comprises a plurality of pedestals, each pedestal extending from the edge tile toward the outer wall.  
     
     
         11 . A double wall structure as claimed in  claim 1  wherein the securing means is located generally centrally of the main tiles.  
     
     
         12 . A double wall structure as claimed in  claim 1  wherein the securing means is tightly secured to the main tiles.  
     
     
         13 . A double wall structure as claimed in any one of claims  1 - 12  wherein further securing means are provided, the further securing means are loosely secured to the main tiles.  
     
     
         13 . A gas turbine engine comprising a combustor wherein the combustor comprises a double wall structure as claimed in  claim 1 .  
     
     
         14 . A method of assembling a double wall structure of a combustor of a gas turbine engine, the wall structure comprising an outer wall and an inner wall, the method comprising the steps of: 
 securing a plurality of main tiles to the outer wall by a securing means;    securing a plurality of edge tiles to the outer wall by securing means so that each edge tile overlaps at least one edge of a main tile thereby further securing the main tile to the outer wall.