Liner assembly, engine housing, and methods of assembling the same
A liner assembly includes a core and a septum coupled to the core. The liner assembly also includes a facesheet coupled to the septum. The facesheet includes a plurality of slots defined therethrough. Each slot of the plurality of slots is substantially continuous over a selected portion of a surface and perpendicular to or parallel to a centerline of the liner assembly.
1. A liner assembly comprising:
a core;
a septum coupled to said core; and
a facesheet coupled to said septum, said facesheet comprising an array having a plurality of slots defined therethrough with intervening strips, said slots parallel to adjacent slots in the array with the intervening strips extending between the slots, wherein the slots and intervening strips are continuous over a selected surface covered by the liner assembly.
2. The liner assembly in accordance with claim 1 , wherein the slots and intervening strips in the array are oriented perpendicular to an airflow over the face sheet.
3. The liner assembly in accordance with claim 1 , wherein said plurality of slots define a width of between 0.005 inches and 0.06 inches.
4. The liner assembly in accordance with claim 1 , wherein said plurality of slots include a maximum width of 0.06 inches.
5. The liner assembly in accordance with claim 1 , wherein the intervening strips have a width of 0.05 inches to 0.50 inches.
6. The liner assembly in accordance with claim 1 , wherein said facesheet has a porosity in a range of between 5 percent and 40 percent open area.
7. An engine housing having a centerline and an axis extending through the engine housing parallel to the centerline, said engine housing comprising:
a nacelle comprising an inner surface;
a core casing comprising an outer surface, wherein said inner surface and said out surface are configured to be exposed to an airflow traveling in a direction generally parallel to the axis; and
a liner assembly coupled to at least one of said inner surface and said outer surface, said liner assembly comprising:
a core;
a septum coupled to said core; and
a facesheet coupled to said septum, said facesheet comprising an array having a plurality of parallel slots defined therethrough with intervening strips extending between the parallel slots, wherein the slots are continuous over the inner surface covered by the liner assembly.
8. The engine housing in accordance with claim 7 , wherein said plurality of slots and intervening strips are oriented circumferentially with respect to the centerline.
9. The aircraft engine housing in accordance with claim 7 , wherein said facesheet is coupled to only a portion of at least one of said inner surface and said outer surface.
10. The aircraft engine housing in accordance with claim 7 , wherein said plurality of slots include a maximum width of 0.06 inches.
11. The aircraft engine housing in accordance with claim 7 , wherein said septum is coupled between said core and said facesheet.
12. The aircraft engine housing in accordance with claim 7 , wherein said facesheet has a porosity in a range of between 5 percent to 40 percent open area.
13. A method of assembling a liner assembly, said method comprising:
coupling a septum to a core; and
coupling a facesheet to the septum, wherein the facesheet comprises an array having a plurality of slots defined therethrough with intervening strips, said slots is parallel to adjacent slots in the array with the intervening strips extending between the slots, wherein the slots and intervening strips are continuous over a selected surface covered by the liner assembly.
14. The method in accordance with claim 13 , further comprising coupling the core to an inner surface of an engine nacelle.
15. The method in accordance with claim 14 , wherein coupling the core to the inner surface comprises coupling the facesheet including the array with the plurality of slots perpendicular to the centerline with each slot having a width between 0.005 inches and 0.06 inches.
16. The method in accordance with claim 14 , wherein coupling the core to the inner surface comprises coupling the facesheet including the plurality of slots parallel to the airflow with each slot having a width between 0.005 inches and 0.10 inches.