Nacelle liner comprising unit cell resonator networks

Patent metadata

Field	Value
Publication number	US-12104536-B2
Application number	US-202117318898-A
Country	US
Kind code	B2
Filing date	May 12, 2021
Priority date	May 12, 2021
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

An acoustic attenuation structure for a gas turbine engine includes a periodic structure having a first unit cell, the first unit cell having a first central body and a first axial tube disposed on the first central body and a second axial tube disposed on the first central body, opposite the first axial tube, each of the first axial tube and the second axial tube being in fluid communication with one another through the first central body.

First claim

What is claimed is:

1. A propulsion system comprising:
a fan nacelle;
a core nacelle disposed radially inward from the fan nacelle; and
one or more acoustic attenuation structures coupled to at least one of the fan nacelle and the core nacelle, each of the one or more acoustic attenuation structures comprising:
a facesheet including perforations disposed therein;
a back plate;
a periodic structure having a plurality of unit cells, each of the plurality of unit cells having a first central body and a first axial tube disposed on the first central body and a second axial tube disposed on the first central body, opposite the first axial tube, each of the first axial tube and the second axial tube being in fluid communication with one another through the first central body, the facesheet and the back plate configured to enclose the periodic structure therein;
a volume at least partially defined by an external surface of each of the plurality of unit cells; and
a filler mesh disposed within the volume.

2. The propulsion system of claim 1 , wherein each of the plurality of unit cells includes a first lateral tube, disposed on and in fluid communication with the first central body, and a second lateral tube, opposite the first lateral tube and disposed on and in fluid communication with the first central body.

3. The propulsion system of claim 2 , wherein:
each of the plurality of unit cells includes a third lateral tube, disposed on and in fluid communication with the first central body, and a fourth lateral tube, opposite the third lateral tube and disposed on and in fluid communication with the first central body, and
each of the first axial tube, the second axial tube, the first lateral tube, the second lateral tube, the third lateral tube and the fourth lateral tube are in fluid communication with each other via the first central body.

4. The propulsion system of claim 3 , wherein the first axial tube exhibits a first axial tube size, the second axial tube exhibits a second axial tube size, the first lateral tube exhibits a first lateral tube size, the second lateral tube exhibits a second lateral tube size, the third lateral tube exhibits a third lateral tube size and the fourth lateral tube exhibits a fourth lateral tube size and at least one of the first axial tube size, the second axial tube size, the first lateral tube size, the second lateral tube size, the third lateral tube size or the fourth lateral tube size exhibits a first size and at least one of the first axial tube size, the second axial tube size, the first lateral tube size, the second lateral tube size, the third lateral tube size or the fourth lateral tube size exhibits a second size that is different from the first size.

5. The propulsion system of claim 3 , wherein at least one of the first axial tube, the second axial tube, the first lateral tube, the second lateral tube, the third lateral tube or the fourth lateral tube is completely sealed via a wall configured to block a flow of fluid therethrough.

6. The propulsion system of claim 3 , wherein at least one of the first axial tube, the second axial tube, the first lateral tube, the second lateral tube, the third lateral tube or the fourth lateral tube is partially sealed.

7. The propulsion system of claim 3 , wherein at least one of the first axial tube, the second axial tube, the first lateral tube, the second lateral tube, the third lateral tube or the fourth lateral tube is partially sealed via a mesh configured to partially restrict a flow of fluid therethrough.

8. The propulsion system of claim 2 , wherein the plurality of unit cells includes a first unit cell and a second unit cell, and wherein the second unit cell is interconnected to the first unit cell, the second unit cell having a second central body and a pair of axial tubes disposed and a pair of lateral tubes disposed on and in fluid communication with the second central body.

9. The propulsion system of claim 8 , wherein the first lateral tube of the first unit cell is interconnected to one of the pair of lateral tubes of the second unit cell.

10. The propulsion system of claim 9 , wherein the plurality of unit cells includes a third unit cell and a fourth unit cell, and wherein the third unit cell is interconnected to the first unit cell and the fourth unit cell is interconnected to the second unit cell and to the third unit cell.

11. The propulsion system of claim 10 , wherein:
each of the first unit cell, the second unit cell, the third unit cell and the fourth unit cell are comprised within a layer of unit cells, and
the volume is formed extending between the first unit cell, the second unit cell, the third unit cell and the fourth unit cell.

12. The propulsion system of claim 11 , wherein the layer of unit cells is one of a plurality of layers of unit cells, the plurality of layers of unit cells exhibiting a plurality of volumes and wherein the plurality of volumes includes a first volume having a first volume size and a second volume having a second volume size different from the first volume size.

13. The propulsion system of claim 11 , wherein the first unit cell exhibits a first unit cell size, the second unit cell exhibits a second unit cell size, the third unit cell exhibits a third unit cell size and the fourth unit cell exhibits a fourth unit cell size and at least one of the first unit cell size, the second unit cell size, the third unit cell size or the fourth unit cell size exhibits a first size and at least one of the first unit cell size, the second unit cell size, the third unit cell size or the fourth unit cell size exhibits a second size that is different from the first size.

14. The propulsion system of claim 1 , wherein the filler mesh is configured as a bulk absorber to reduce or restrict a flow of air through the volume.

15. The propulsion system of claim 1 , wherein:
the first axial tube of a first of the plurality of unit cells is coupled to the second axial tube of a second of the plurality of unit cells,
the second axial tube of the first of the plurality of unit cells is coupled to the first axial tube of a third of the plurality of unit cells.

16. A propulsion system, comprising:
a fan nacelle;
a core nacelle disposed radially inward from the fan nacelle, the fan nacelle and the core nacelle at least partially defining a flow path therebetween; and
one or more noise attenuation panels coupled to at least one of the fan nacelle and the core nacelle, each of the one or more noise attenuation panels disposed adjacent to the flow path, and each of the one or more noise attenuation panels comprising:
a first periodic structure having a first unit cell, a second unit cell, a third unit cell and a fourth unit cell, wherein each of the first unit cell, the second unit cell, the third unit cell and the fourth unit cell includes an axial tube disposed on a central body, wherein the central body is interconnected via a plurality of lateral tubes extending from the central body, the first periodic structure forming a first lateral layer of unit cells;
a facesheet and a back plate configured to enclose the first periodic structure, the facesheet including perforations disposed therein;
a volume at least partially defined by an external surface of each of the first unit cell, the second unit cell, the third unit cell, and the fourth unit cell; and
a filler mesh disposed within the volume.

17. The propulsion system of claim 16 , further comprising a second periodic structure, the second periodic structure forming a second lateral layer of unit cells interc

Assignees

• Rohr Inc

Inventors

• Winkler Julian
• Homma Kenji
• Reimann Craig Aaron
• Mendoza Jeffrey Michael

Classifications

• B64D2033/0206

  comprising noise reduction means, e.g. acoustic liners · CPC title

• F02K1/827

  Sound absorbing structures or liners · CPC title

• F02C7/045

  having provisions for noise suppression · CPC title

• G10K11/172 Primary

  using resonance effects · CPC title

• G10K11/161

  in systems with fluid flow (G10K11/162 takes precedence; gas flow silencers or exhaust apparatus for machines or engines in general or for internal combustion engine F01N, noise absorbers in pipes or pipe systems F16L55/02; noise absorption in air conditioning and ventilation F24F13/24; silencing exhaust or propulsion jets in aircraft B64D33/06) · CPC title