Unit cell resonator networks for turbomachinery bypass flow structures

Patent metadata

Field	Value
Publication number	US-2023117838-A1
Application number	US-202117503285-A
Country	US
Kind code	A1
Filing date	Oct 16, 2021
Priority date	Oct 16, 2021
Publication date	Apr 20, 2023
Grant date	—

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 . An exit guide vane for a propulsion system, comprising:
a suction-side facesheet; a pressure-side facesheet; and an acoustic attenuation structure disposed between the suction-side facesheet and the pressure-side facesheet, the acoustic attenuation structure including 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.

2 . The exit guide vane of claim 1 , wherein the first unit cell 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 exit guide vane of claim 2 , wherein the first unit cell 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.

4 . The exit guide vane of claim 3 , wherein 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.

5 . The exit guide vane of claim 4 , 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 at least partially sealed via a septum configured to restrict a flow of fluid therethrough.

6 . The exit guide vane of claim 2 , further comprising a second unit cell interconnected to the first unit cell, the second unit cell having a second central body and a pair of axial tubes and a pair of lateral tubes disposed on and in fluid communication with the second central body.

7 . The exit guide vane of claim 6 , 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.

8 . The exit guide vane of claim 7 , further comprising a third unit cell interconnected to the first unit cell and a fourth unit cell interconnected to the second unit cell and to the third unit cell, wherein each of the first unit cell, the second unit cell, the third unit cell and the fourth unit cell is comprised within a layer of unit cells.

9 . A bifurcation structure for a propulsion system, comprising:
a first-side facesheet; a second-side facesheet; and an acoustic attenuation structure disposed between the first-side facesheet and the second-side facesheet, the acoustic attenuation structure including 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.

10 . The bifurcation structure of claim 9 , wherein the first unit cell 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.

11 . The bifurcation structure of claim 10 , wherein the first unit cell 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.

12 . The bifurcation structure of claim 11 , wherein 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.

13 . The bifurcation structure of claim 12 , 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 septum configured to partially restrict a flow of fluid therethrough.

14 . The bifurcation structure of claim 10 , further comprising a second unit cell interconnected to the first unit cell, the second unit cell having a second central body and a pair of axial tubes and a pair of lateral tubes disposed on and in fluid communication with the second central body.

15 . The bifurcation structure of claim 14 , further comprising a third unit cell interconnected to the first unit cell and a fourth unit cell interconnected to the second unit cell and to the third unit cell, wherein each of the first unit cell, the second unit cell, the third unit cell and the fourth unit cell is comprised within a layer of unit cells.

16 . A noise attenuation panel for a structure within a propulsion system, 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 a central body interconnected via a plurality of lateral tubes extending from the central body, the first periodic structure forming a first lateral layer of unit cells and a facesheet and a back plate configured to enclose the first periodic structure.

17 . The noise attenuation panel of claim 16 , further comprising a second periodic structure, the second periodic structure forming a second lateral layer of unit cells interconnected to the first lateral layer of unit cells.

18 . The noise attenuation panel of claim 17 , wherein the second lateral layer of unit cells is interconnected to the first lateral layer of unit cells via a plurality of axial tubes.

19 . The noise attenuation panel of claim 18 , wherein the first lateral layer of unit cells and the second lateral layer of unit cells each comprise a plurality of volumes extending axially between adjacent pairs of unit cells that comprise the first lateral layer of unit cells and the second lateral layer of unit cells and wherein the plurality of volumes defines a space exterior to the first lateral layer of unit cells, the space being either partially restricted or completely restricted by a volume filler.

20 . The noise attenuation panel of claim 19 , 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.

Assignees

• Raytheon Tech Corp

Inventors

• Reimann Craig Aaron
• Winkler Julian
• Homma Kenji
• Mendoza Jeffrey Michael
• Reba Ramons A

Classifications

• F02K1/827

  Sound absorbing structures or liners · CPC title

• F02C7/24 Primary

  Heat or noise insulation (air intakes having provisions for noise suppression F02C7/045; turbine exhaust heads, chambers, or the like F01D25/30; silencing nozzles of jet-propulsion plants F02K1/00) · CPC title

• G10K11/16 Primary

  Methods or devices for protecting against, or for damping, noise or other acoustic waves in general (G10K11/36 takes precedence) · CPC title

• F05D2220/323

  for aircraft propulsion, e.g. jet engines · CPC title

• G10K11/168

  Plural layers of different materials, e.g. sandwiches · CPC title