Shroud hanger assembly

Abstract

A shroud hanger assembly ( 30 ) or shroud assembly is provided for dimensionally incompatible components wherein the assembly includes a multi-piece hanger ( 32 ), for example having a forward hanger portion ( 34 ) and a rearward hanger portion ( 36 ). A cavity ( 46 ) is formed between the parts; wherein a shroud ( 50 ) may be positioned which is formed of a low coefficient of thermal expansion material. The hanger ( 32 ) and shroud ( 50 ) may be formed of the same material or differing materials in order to better match the thermal growth between the hanger and the shroud. When the shroud ( 50 ) is positioned within the hanger opening or cavity ( 46 ), one of the forward ( 34 ) and rearward hanger ( 36 ) portions may be press fit or otherwise connected into the other of the forward ( 34 ) and rearward ( 36 ) hanger portion.

1 . A shroud hanger assembly for dimensionally incompatible components, comprising:
 a shroud hanger formed of a first material, said shroud hanger having a first leg, a second leg, and a web extending between said first leg and said second leg;   a shroud formed of a low coefficient of thermal expansion second material; and   at least one cooling cavity located in said shroud hanger.   
     
     
         2 . The shroud hanger assembly of  claim 1 , said at least one cooling cavity extending below said web. 
     
     
         3 . The shroud hanger assembly of  claim 1 , said at least one cooling cavity allowing entry of cooling air into shroud hanger and reducing thermal growth. 
     
     
         4 . The shroud hanger assembly of  claim 1 , said at least one cooling cavity being arcuate. 
     
     
         5 . The shroud hanger assembly of  claim 1 , said at least one cooling cavity being polygon shaped. 
     
     
         6 . The shroud hanger assembly of  claim 1 , wherein the at least one cooling cavity extends into the second leg of the shroud hanger. 
     
     
         7 . The shroud hanger assembly of  claim 6 , wherein the at least one cooling cavity is a generally rectangular shaped opening with circumferentially extending sidewalls for a long opening of the rectangular shape. 
     
     
         8 . The shroud hanger assembly of  claim 6 , wherein the at least one cooling cavity has curved corners. 
     
     
         9 . The shroud hanger assembly of  claim 1 , further comprising:
 an impingement baffle positioned adjacent to the shroud hanger to direct or guide air flow from the at least one cooling channel to provide impingement flow to the shroud.   
     
     
         10 . The shroud hanger assembly of  claim 9 , wherein the impingement baffle includes a plurality of holes along a lower surface. 
     
     
         11 . The shroud hanger assembly of  claim 1 , wherein the shroud hanger assembly is a single structure. 
     
     
         12 . The shroud hanger assembly of  claim 1 , wherein the shroud hanger assembly is a single circumferential structure. 
     
     
         13 . The shroud hanger assembly of  claim 1 , wherein the first leg is a forward leg relative to an air flow through an engine and the second leg is an aft leg positioned downstream relative to the air flow of the first leg. 
     
     
         14 . The shroud hanger assembly of  claim 1 , further comprising:
 an end wall located at a circumferential end of the shroud hanger.   
     
     
         15 . The shroud hanger assembly of  claim 1 , wherein the first material and the low coefficient of thermal expansion second material are the same. 
     
     
         16 . The shroud hanger assembly of  claim 1 , wherein the first material is a ceramic matrix composite. 
     
     
         17 . The shroud hanger assembly of  claim 1 , wherein the low coefficient of thermal expansion second material is a ceramic matrix composite. 
     
     
         18 . The shroud hanger assembly of  claim 1 , further comprising:
 a chordal interference rib on at least one of the first leg or the second leg.   
     
     
         19 . A gas turbine engine comprising the shroud hanger assembly of  claim 1 .