# US 2014/0196458 A1 · Damping device and gas turbine combustor

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- Number: US 2014/0196458 A1
- Document ID: US20140196458A1
- Status: Published application
- Kind: A1
- Application number: 14/211,490
- Filed: 2014-03-14
- Published: 2014-07-17
- Earliest claimed: 2007-11-21
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Mitsubishi Heavy Industries, Ltd.
- Inventors: Takanori Ito; Keisuke Matsuyama; Kazufumi Ikeda; Satoshi Tanimura; Shinji Akamatsu
- Web page: https://patentgrep.com/patent/US20140196458A1

## CPC

- 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)
- F01D 25/04: Antivibration arrangements
- F23M 20/005: {Noise absorbing means}
- F23R 3/26: Controlling the air flow
- G10K 11/161: {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)}
- G10K 11/172: using resonance effects
- F23R 2900/00014: Reducing thermo-acoustic vibrations by passive means, e.g. by Helmholtz resonators
- 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)
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- 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
- 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)
- G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR

## Abstract

In a damping device according to the present invention, a damping device 63 is mounted on a bypass pipe 61 that supplies an amount of high-pressure air to a combustor transition piece 33. The damping device 63 includes a fluid introducing unit 71 that forms a fluid introduction space B by covering an outer peripheral portion of the bypass pipe 61, a plurality of acoustic boxes 73a and 73b that forms resonance spaces Da and Db with the base portions connected to the fluid introducing unit 71 and the end portions extending along the outer peripheral portion of the bypass pipe 61 in the circumferential direction, and partition plates 74a and 74b that form resonance ducts Ea and Eb of a predetermined length by partitioning the resonance spaces Da and Db.

## Claims

### Claim 1

A damping device that is mounted on an outer peripheral portion of a pipe including a flow passage through which fluid flows and that damps acoustic vibrations by introducing therein the fluid in the pipe, the damping device comprising:
a fluid introducing unit in which a fluid introduction space that is able to introduce therein the fluid in the flow passage is formed by covering at least a part of the outer peripheral portion of the pipe;
a plurality of acoustic boxes that includes a resonance space communicably connected with the fluid introduction space, a base portion connected to the fluid introducing unit, and an end portion extending along the outer peripheral portion of the pipe; and
a partition plate that forms a resonance duct of a predetermined length by partitioning each resonance space, wherein the resonance duct includes a resistance member that provides resistance to fluid.