# US 12,110,844 B2 · Zoned liner exhaust with buried N-core

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- Number: US 12,110,844 B2
- Document ID: US12110844B2
- Status: Granted
- Kind: B2
- Application number: 17/987,671
- Filed: 2022-11-15
- Published: 2024-05-16
- Granted: 2024-10-08
- Earliest claimed: 2022-11-15
- Assignees: Rohr, Inc.
- Applicants: Rohr, Inc.
- Inventors: Christopher C. Koroly; Jose S. Alonso-Miralles
- Web page: https://patentgrep.com/patent/US12110844B2

## CPC

- F02K 1/827: {Sound absorbing structures or liners}
- B64D 33/06: {Silencing exhaust or propulsion jets}
- F02C 7/24: 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)
- F02K 1/04: Mounting of an exhaust cone in the jet pipe
- F02K 1/44: Nozzles having means, e.g. a shield, reducing sound radiation in a specified direction (F02K1/40 takes precedence)
- F05D 2220/323: for aircraft propulsion, e.g. jet engines
- F05D 2260/96: Preventing, counteracting or reducing vibration or noise
- F02K: JET-PROPULSION PLANTS (features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C7/00, F02C9/00)
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A center plug for attenuating noise in a gas turbine engine includes an inner skin, a forward bulkhead, and aft bulkhead, and a noise attenuation panel. The inner skin has a substantially cylindrical shape and extending along an axial centerline. The forward bulkhead is disposed proximate a forward end of the inner skin. The forward bulkhead is connected to and extends radially outward from the inner skin. The aft bulkhead is disposed proximate an aft end of the inner skin. The aft bulkhead is connected to and extending radially outward from the inner skin. The noise attenuation panel is positioned intermediate the inner skin and partially divides a region bounded by the inner skin, the forward bulkhead and the aft bulkhead into.

## Claims

### Claim 1

A center plug for attenuating noise in a gas turbine engine, comprising:
an inner skin, the inner skin having a substantially cylindrical shape and extending along an axial centerline;
a forward bulkhead disposed proximate a forward end of the inner skin, the forward bulkhead connected to and extending radially outward from the inner skin;
an aft bulkhead disposed proximate an aft end of the inner skin, the aft bulkhead connected to and extending radially outward from the inner skin;
an outer skin, the outer skin connected to and positioned radially outward of the forward bulkhead and the aft bulkhead;
a plurality of baffles spaced circumferentially about the inner skin and extend radially between the inner skin and the outer skin and axially between the forward bulkhead and the aft bulkhead; and
a noise attenuation panel disposed on a first side of each baffle of the plurality of baffles, the noise attenuation panel positioned such that noise is received in a rotating pattern in a first direction.

### Claim 2 (depends on 1)

The center plug of claim 1, wherein the outer skin, the inner skin, the forward bulkhead and the aft bulkhead define an annular chamber.

### Claim 3 (depends on 2)

The center plug of claim 2, wherein the noise attenuation panel extends between the outer skin and the inner skin.

### Claim 4 (depends on 2)

The center plug of claim 2, wherein the outer skin includes an acoustically permeable portion in fluid communication with the annular chamber.

### Claim 5 (depends on 1)

The center plug of claim 1, wherein the noise attenuation panel is configured to attenuate noise at a frequency of at least 1500 Hz.

### Claim 6 (depends on 1)

The center plug of claim 1, wherein the noise attenuation panel is a first noise attenuation panel, the noise is first noise, and the rotating pattern is a first rotating pattern, and further comprising:
a second noise attenuation panel disposed on a second side of each baffle of the plurality of baffles, the second noise attenuation panel positioned such that second noise is received in a second rotating pattern in a second direction, wherein the second direction is opposite the first direction.

### Claim 7

A noise attenuation system for a gas turbine engine, comprising:
an exhaust nozzle having a first noise attenuation panel disposed on a radial inner side of the exhaust nozzle;
a center plug, the exhaust nozzle configured to surround the center plug, the center plug comprising:
an inner skin, the inner skin having a substantially cylindrical shape and extending along an axial centerline,
a forward bulkhead disposed proximate a forward end of the inner skin, the forward bulkhead connected to and extending radially outward from the inner skin,
an aft bulkhead disposed proximate an aft end of the inner skin, the aft bulkhead connected to and extending radially outward from the inner skin,
an outer skin, the outer skin connected to and positioned radially outward of the forward bulkhead and the aft bulkhead,
a plurality of baffles spaced circumferentially about the inner skin and extend radially between the inner skin and the outer skin and axially between the forward bulkhead and the aft bulkhead, and
a second noise attenuation panel disposed on a first side of each baffle of the plurality of baffles, the second noise attenuation panel positioned such that the noise is received in a rotating pattern in a first direction.

### Claim 8 (depends on 7)

The noise attenuation system of claim 7, wherein the outer skin, the inner skin, the forward bulkhead, and the aft bulkhead define an annular chamber.

### Claim 9 (depends on 7)

The noise attenuation system of claim 7, wherein the second noise attenuation panel extends between an outer skin and the inner skin.

### Claim 10 (depends on 7)

The noise attenuation system of claim 7, wherein the first noise attenuation panel comprises a single panel configured to extend circumferentially about the exhaust nozzle.

### Claim 11 (depends on 8)

The noise attenuation system of claim 8, further comprising a plurality of baffles spaced circumferentially about the inner skin and extending radially between the inner skin and the outer skin and axially between the forward bulkhead and the aft bulkhead.

### Claim 12 (depends on 11)

The noise attenuation system of claim 11, wherein the plurality of baffles includes four baffles spaced at ninety-degree intervals such that the annular chamber is divided into four equally sized resonator cavities.

### Claim 13 (depends on 11)

The noise attenuation system of claim 11, wherein the second noise attenuation panel is disposed on at least one of the plurality of baffles.

### Claim 14 (depends on 13)

The noise attenuation system of claim 13, wherein the outer skin includes an acoustically permeable portion in fluid communication with the annular chamber.

### Claim 15 (depends on 14)

The noise attenuation system of claim 14, wherein the acoustically permeable portion is formed by a plurality of openings extending through the outer skin such that the acoustically permeable portion coincides with the resonator cavities.

### Claim 16 (depends on 7)

The noise attenuation system of claim 7, wherein the first noise attenuation panel and the second noise attenuation panel are configured to attenuate noise at a frequency of at least 1500 Hz.

### Claim 17 (depends on 7)

The noise attenuation system of claim 7, further comprising an outer layer integral with the second noise attenuation panel, wherein the outer layer is a perforated sheet of the second noise attenuation panel.

### Claim 18 (depends on 7)

The noise attenuation system of claim 7, wherein the noise is first noise and the rotating pattern is a first rotating pattern, and further comprising:
a third noise attenuation panel disposed on a second side of each baffle of the plurality of baffles, the third noise attenuation panel positioned such that second noise is received in a second rotating pattern in a second direction, wherein the second direction is opposite the first direction.