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. An acoustic structure for a gas turbine engine, comprising:
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;
a second rail configured for attachment to the static structure; and
a first edge retainer configured to secure a first side of the housing to the static structure, the edge retainer including an aperture configured to receive a fastener that functions to secure the edge retainer to the static structure, wherein the first edge retainer is configured to conform to at least one of a surface of an exit guide vane or a base element to which the exit guide vane is mounted, the first edge retainer being positioned between the cellular structure and at least one of the exit guide vane or the base element and extending along a side length of the cellular structure.
2. The acoustic structure of claim 1 , wherein the first rail includes an aperture configured to receive a fastener for attachment to the static structure.
3. The acoustic structure of claim 2 , wherein the aperture is removed from exposure to a bypass flow path.
4. The acoustic structure of claim 3 , wherein the second rail includes a hook for attachment to the static structure.
5. The acoustic structure of claim 4 , wherein the hook is removed from exposure to the bypass flow path.
6. The acoustic structure of claim 5 , wherein the second rail is a forward rail with respect to a longitudinal axis extending through the gas turbine engine.
7. The acoustic structure of claim 5 , wherein the second rail extends a circumferential distance with respect to a longitudinal axis extending through the gas turbine engine and the hook extends along at least a portion of the circumferential distance.
8. The acoustic structure of claim 1 , further comprising a second edge retainer configured to secure a second side of the housing to the static structure.
9. The acoustic structure of claim 8 , wherein the first edge retainer and the second edge retainer include an upper rail configured to engage the housing.
10. The acoustic structure of claim 9 , wherein the first edge retainer and the second edge retainer include a center rail configured to engage the static structure.
11. The acoustic structure of claim 10 further comprising a pad disposed between the upper rail of the first edge retainer and the first side of the housing.
12. The acoustic structure of claim 11 , wherein the first rail includes an aperture configured to receive a fastener for attachment to the static structure and the aperture is removed from exposure to a bypass flow path.
13. The acoustic structure of claim 12 , wherein the second rail includes a hook for attachment to the static structure and the hook is removed from exposure to the bypass flow path.