COOLED DUCT FOR GAS TURBINE ENGINE

摘要

A cooled exhaust duct (10) for use in gas turbine engines is provided. The cooled exhaust duct (10) includes an axial centerline (18), a circumference, an annulus (20), and a plurality of radially expandable bands (22). The annulus (20) is disposed between a first wall (24) and a second wall (26), and extends along the axial centerline (18). The first wall (24) is disposed radially inside of the second wall (26). Each of the plurality of radially expandable bands (22) extends circumferentially within the annulus (20). The bands (22) are axially spaced apart from one another. Each band (22) includes a first portion (32) attached to the first wall (24), a second portion (34) attached to the second wall (26) and an intermediate portion (36) connected to the first and second portions (32, 34). The bands (22) create circumferentially extending compartments that inhibit axial travel of the cooling air within the annulus (20).