Gas turbine exhaust case with acoustic panels

摘要

A turbine exhaust case for a gas turbine engine has an outer shroud and an inner shroud concentrically defining therebetween an annular gaspath for channelling hot gases. A plurality of circumferentially spaced-apart turbine exhaust struts extends radially across the hot gaspath. The inner shroud may be provided in the form of an acoustic panel. The acoustic panel has a radially outwardly facing surface defining the radially inner flow boundary surface of the gaspath. The acoustic panel is mechanically fastened to the radially inner end of the struts.

主权项

1. A turbine exhaust case disposed downstream of a last stage of turbine blades of a gas turbine for exhausting hot gases to the atmosphere, the engine having an axis, the 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 channeling hot gases received from the last stage of turbine blades of the engine, a plurality of circumferentially spaced-apart struts extending radially across the gaspath between the radially outer and the radially inner annular shrouds, at least one of said radially inner and outer shrouds being defined by at least one arcuate acoustic panel, said at least one arcuate acoustic panel having a radially facing surface defining a flow boundary surface of said gaspath, the at least one arcuate acoustic panel having an acoustic treatment including a core layer of cellular honeycomb like material and a plurality of acoustic holes defined in the radially facing surface defining the flow boundary surface, said at least one acoustic panel having an array of circumferentially spaced-apart fastener receiving holes extending thicknesswise therethrough, each of said fastener receiving holes being aligned with a corresponding connection hole defined in an end wall of an associated one of said struts, and a plurality of fasteners projecting radially from said fastener receiving holes of said at least one acoustic panel into said connection holes of said struts, the fasteners structurally connecting the struts to said at least one acoustic panel.