Combustor for gas turbine engine

Abstract

In a combustor for a gas turbine engine, a radially outer end part of a dilution air introduction passage is radially slidably fitted into an inner periphery of an outer opening. A radially inner end part of the passage axially slidably abuts against an open edge of an inner opening. Therefore, even if outer and inner wall parts undergo relative movement in radial or axial direction due to difference in thermal expansion amount, it is possible to prevent occurrence of excessive stress and ensure airtightness for the outer and inner openings, stabilizing amount of dilution air introduced into a combustion chamber. Air does not leak into space between the outer and inner wall parts from the radially outer end part, therefore, air jet passing through an impingement cooling hole of the outer wall part collides with the inner wall part without disturbed, enhancing cooling effect of the inner wall part.

What is claimed is: 
     
         1 . A combustor for a gas turbine engine, comprising
 an outer wall part having formed therein an impingement cooling hole,   an inner wall part having formed therein an effusion cooling hole, and   a tubular dilution air introduction passage providing a connection between an outer opening formed in the outer wall part and an inner opening formed in the inner wall part, the dilution air introduction passage introducing dilution air into a combustion chamber,   wherein a radially outer end part of the dilution air introduction passage is radially slidably fitted into an inner periphery of the outer opening, and   a radially inner end part of the dilution air introduction passage axially slidably abuts against an open edge of the inner opening.   
     
     
         2 . The combustor for a gas turbine engine according to  claim 1 , wherein the inner opening protrudes from the inner wall part radially outward in a tubular shape. 
     
     
         3 . The combustor for a gas turbine engine according to  claim 2 , wherein the radially inner end part of the dilution air introduction passage includes an annular flange portion, the annular flange portion axially slidably abutting against the open edge of the inner opening.