# US 11,898,752 B2 · Thermo-acoustic damper in a combustor liner

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- Number: US 11,898,752 B2
- Document ID: US11898752B2
- Status: Granted
- Kind: B2
- Application number: 17/932,332
- Filed: 2022-09-15
- Published: 2023-11-16
- Granted: 2024-02-13
- Earliest claimed: 2022-05-16
- Assignees: General Electric Company
- Applicants: General Electric Company
- Inventors: Hiranya Nath; Ravindra Shankar Ganiger; Michael A. Benjamin
- Web page: https://patentgrep.com/patent/US11898752B2

## CPC

- F23R 3/002: {Wall structures (F23R3/02 and F23R3/007 take precedence)}
- F23M 20/005: {Noise absorbing means}
- F23R 3/06: Arrangement of apertures along the flame tube
- F23R 2900/00014: Reducing thermo-acoustic vibrations by passive means, e.g. by Helmholtz resonators
- F23R 2900/03042: Film cooled combustion chamber walls or domes
- F23R: GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS (fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures F23C10/16)
- F23M: CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR

## Abstract

A hollow plank of a combustor liner defining a combustion chamber including an inner wall having a plurality of inner openings and one or more inner holes, an outer wall having one or more outer openings and a plurality of outer holes, a plurality of lateral walls coupled to the inner wall and the outer wall to define a cavity, and a partition wall connected to the plurality of lateral walls and dividing the cavity into a first sub-cavity and a second sub-cavity. The one or more outer openings communicate with the first sub-cavity and communicate through a plurality of tubes with the second sub-cavity. The plurality of inner openings communicate with the second sub-cavity and communicate with the first sub-cavity through one or more bypass tubes. The first sub-cavity or the second sub-cavity, or both, are frequency tuned to reduce combustion dynamic frequencies.

## Claims

### Claim 1

A hollow plank of a combustor liner that defines a combustion chamber, the hollow plank comprising:
an inner wall having a plurality of inner openings and one or more inner holes;
an outer wall having one or more outer openings and a plurality of outer holes;
a plurality of lateral walls coupled to the inner wall and the outer wall to define a cavity; and
a partition wall connected to the plurality of lateral walls, provided between the inner wall and the outer wall, and dividing the cavity into a first sub-cavity and a second sub-cavity,
wherein the outer wall, the partition wall, and the plurality of lateral walls define the first sub-cavity, and the inner wall, the partition wall, and the plurality of lateral walls define the second sub-cavity,
wherein the one or more outer openings in the outer wall communicate with the first sub-cavity,
wherein the plurality of outer holes in the outer wall communicate through a plurality of tubes with the second sub-cavity to bypass the first sub-cavity,
wherein the plurality of inner openings in the inner wall communicate with the second sub-cavity,
wherein the one or more inner holes in the inner wall communicate with the first sub-cavity through one or more bypass tubes to bypass the second sub-cavity, and
wherein the first sub-cavity or the second sub-cavity or both are frequency tuned to reduce combustion dynamic frequencies.

### Claim 2 (depends on 1)

The hollow plank according to claim 1, wherein the one or more inner holes together with the one or more bypass tubes are provided to tune the first sub-cavity to dampen the combustion dynamic frequencies.

### Claim 3 (depends on 1)

The hollow plank according to claim 1, wherein the inner wall comprises a thermal barrier coating (TBC) to protect the inner wall from hot gases inside the combustion chamber.

### Claim 4 (depends on 1)

The hollow plank according to claim 1, wherein the plurality of outer holes in the outer wall are orthogonal with respect to the outer wall.

### Claim 5 (depends on 1)

The hollow plank according to claim 1, wherein the one or more outer openings in the outer wall are orthogonal with respect to the outer wall.

### Claim 6 (depends on 1)

The hollow plank according to claim 1, wherein the plurality of inner openings in the inner wall are oblique with respect to the inner wall.

### Claim 7 (depends on 1)

The hollow plank according to claim 1, wherein the one or more bypass tubes are perpendicular or oblique with respect to the inner wall.

### Claim 8 (depends on 1)

The hollow plank according to claim 1, wherein the plurality of lateral walls comprises a plurality of lateral holes that communicate with the second sub-cavity.

### Claim 9 (depends on 1)

The hollow plank according to claim 1, wherein the inner wall further comprises one or more second inner openings provided to frequency tune the second sub-cavity.

### Claim 10 (depends on 9)

The hollow plank according to claim 9, wherein the one or more second inner openings are orthogonal or oblique with respect to the inner wall.

### Claim 11

A combustor comprising:
a combustor liner defining a combustion chamber, the combustor liner comprising:
a skeleton mesh structure; and
a plurality of hollow planks coupled to the skeleton mesh structure, one or more of the plurality of hollow planks comprising:
an inner wall having a plurality of inner openings and one or more inner holes;
an outer wall having one or more outer openings and a plurality of outer holes;
a plurality of lateral walls coupled to the inner wall and the outer wall to define a cavity; and
a partition wall connected to the plurality of lateral walls, provided between the inner wall and the outer wall, and dividing the cavity into a first sub-cavity and a second sub-cavity,
wherein the outer wall, the partition wall, and the plurality of lateral walls define the first sub-cavity, and the inner wall, the partition wall, and the plurality of lateral walls define the second sub-cavity,
wherein the one or more outer openings in the outer wall communicate with the first sub-cavity,
wherein the plurality of outer holes in the outer wall communicate through a plurality of tubes with the second sub-cavity to bypass the first sub-cavity,
wherein the plurality of inner openings in the inner wall communicate with the second sub-cavity,
wherein the one or more inner holes in the inner wall communicate with the first sub-cavity through one or more bypass tubes to bypass the second sub-cavity, and
wherein the first sub-cavity or the second sub-cavity or both are frequency tuned to reduce combustion dynamic frequencies generated with the combustion chamber.

### Claim 12 (depends on 11)

The combustor according to claim 11, wherein the one or more inner holes together with the one or more bypass tubes are configured to tune the first sub-cavity to damp the combustion dynamic frequencies.

### Claim 13 (depends on 11)

The combustor according to claim 11, wherein the inner wall comprises a thermal barrier coating (TBC) to protect the inner wall from hot gases inside the combustion chamber.

### Claim 14 (depends on 11)

The combustor according to claim 11, wherein the plurality of outer holes in the outer wall are orthogonal with respect to the outer wall.

### Claim 15 (depends on 11)

The combustor according to claim 11, wherein the one or more outer openings in the outer wall are orthogonal with respect to the outer wall.

### Claim 16 (depends on 11)

The combustor according to claim 11, wherein the plurality of inner openings in the inner wall are oblique with respect to the inner wall.

### Claim 17 (depends on 11)

The combustor according to claim 11, wherein the one or more bypass tubes are perpendicular or oblique with respect to the inner wall.

### Claim 18 (depends on 11)

The combustor according to claim 11, wherein the plurality of lateral walls comprises a plurality of lateral holes that communicate with the second sub-cavity.

### Claim 19 (depends on 11)

The combustor according to claim 11, wherein the inner wall comprises one or more second inner openings provided to frequency tune the second sub-cavity.

### Claim 20 (depends on 19)

The combustor according to claim 19, wherein the one or more second inner openings are orthogonal or oblique with respect to the inner wall.