Strut mounting arrangement for gas turbine exhaust case

摘要

A turbine exhaust case comprises inner and outer annular shrouds defining therebetween an annular hot gaspath. A circumferential array of exhaust struts extends across the gaspath. The exhaust struts are mounted at one radial end thereof on a flexible strut mounting structure. The flexible strut mounting structure is radially deflectable relative to the outer and inner shrouds to accommodate thermal expansion of the exhaust struts during engine operation.

主权项

1. A turbine exhaust case for a gas turbine engine having an axis, the turbine exhaust case comprising a radially outer annular shroud and a radially inner annular shroud concentrically mounted about said axis and defining therebetween an annular gaspath for channelling hot gases; at least one strut support ring mounted inside said annular gaspath adjacent to and spaced apart from an associated one of said radially outer annular shroud and said radially inner annular shroud so as to define a radial gap with the associated one of said radially outer annular shroud and said radially inner annular shroud, said at least one strut support ring having a plurality of circumferentially spaced-part axially projecting fingers; and a plurality of circumferentially spaced-apart struts extending radially between said radially inner annular shroud and said radially outer annular shroud, said struts being mounted at a first radial end thereof to said axially projecting fingers of said at least one strut support ring, said axially projecting fingers being radially deflectable into said radial gap in response to a thermal growth of said struts, said at least one strut support ring comprising a first strut support ring mounted to said radially outer annular shroud, wherein an anti-rotation mechanism is provided to retain the first strut support ring against angular movement relative to the radially outer annular shroud, said anti-rotation mechanism comprising at least on male member projecting radially inwardly from said radially outer annular shroud in engagement between two circumferentially adjacent fingers of the axially projecting fingers of the first strut support ring.