Acoustic attenuation structures
Acoustic structures for a gas turbine engine are disclosed. In various embodiments, the acoustic structures comprise a panel in the form of a cellular structure having a plurality of cells; and a housing configured to house the cellular structure, the housing including a first rail configured for attachment to a static structure within the gas turbine engine and a second rail configured for attachment to the static structure. In various embodiments, the acoustic structures comprise a liner in the form of a non-segmented or two-piece structure configured to extend about the inner barrel of a nacelle structure. The disclosed panels and liners are configured to maximize the operational area of the acoustic structures by eliminating obstructions from adjacent flow paths.
1. A gas turbine engine, comprising:
a nacelle;
an engine case; and
a first acoustic structure, the first acoustic structure including:
a cellular structure having a plurality of cells, and
a housing configured to house the cellular structure, the housing including:
a first rail configured for attachment to the engine case;
a second rail configured for attachment to the engine case; and
a first edge retainer configured to secure a first side of the housing to the engine case and a second edge retainer configured to secure a second side of the housing to the engine case, wherein the first edge retainer and the second edge retainer include an upper rail configured to engage the housing and the first edge retainer and the second edge retainer include a center rail configured to engage the engine case.
2. The gas turbine engine of claim 1 , wherein the first rail includes an aperture configured to receive a fastener for attachment to the engine case and the aperture is removed from exposure to a bypass flow path and wherein the second rail includes a hook for attachment to the engine case and the hook is removed from exposure to the bypass flow path.
3. The gas turbine engine of claim 1 , wherein at least one of the first edge retainer and the second edge retainer is configured to conform to a surface of an exit guide vane or to a base element to which the exit guide vane is mounted.