Acoustic damping device

Patent metadata

Field	Value
Publication number	US-9334804-B2
Application number	US-201414505564-A
Country	US
Kind code	B2
Filing date	Oct 3, 2014
Priority date	Oct 9, 2013
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

An acoustic damper includes a neck and a damping volume. The neck has a mouth being in fluid connection with a chamber. The chamber is limited by an inner surface of at least one wall. The acoustic damper device includes a recess located between the mouth of the neck and the inner surface of the wall.

First claim

The invention claimed is:

1. A chamber of a gas turbine, comprising:
at least one wall having an inner surface limiting the chamber; and
an acoustic damper, including:
a neck;
a damping volume, wherein the neck includes a mouth being in fluid connection with the chamber, wherein the at least one wall includes a recess and the mouth of the neck opens into the recess; and
wherein at the inner surface of the at least one wall and adjacent to the recess at least one shield protrudes into the chamber.

2. An acoustic damper, comprising:
a neck and a damping volume, wherein the neck includes a mouth being in fluid connection with a chamber limited by an inner surface of at least one wall, wherein the at least one wall includes a recess and the mouth of the neck opens into the recess, and wherein at the inner surface of the at least one wall and adjacent to the mouth at least one shield protrudes into the chamber.

3. The chamber according to claim 1 , wherein the at least one shield is annular and surrounds the mouth of the neck.

4. The chamber according to claim 1 , comprising:
two shields and the mouth of the neck is located between the shields.

5. The chamber according to claim 1 , wherein inside the chamber a gas flows, and the at least one shield is configured to deflect the gas flow away from the mouth of the neck.

6. The chamber according to claim 1 , wherein an angle between the at least one shield and the at least one wall is 90° or less.

7. The chamber according to claim 1 , wherein the damper is a Helmholtz resonator comprising one or more damping volumes, a half-wave tube, a quarter-wave tube, multi-volume damper, a liner or any kind of acoustic flow through damper.

8. The chamber according to claim 1 , wherein the chamber is a combustor chamber, a mixing chamber, a plenum and/or an air channel of a gas turbine.

9. The chamber according to claim 1 , wherein an angle between the at least one shield and the at least one wall is 60° or less.

10. The chamber according to claim 1 , wherein an angle between the at least one shield and the at least one wall is 45° or less.

11. The chamber according to claim 1 , wherein an angle between the at least one shield and the at least one wall is 30° or less.

12. The chamber according to claim 1 , wherein an angle between the at least one shield and the at least one wall is 20° or less.

Assignees

• Alstom Technology Ltd

Inventors

• Bothien Mirko Ruben
• Tonon Devis
• Genin Franklin Marie
• Pennell Douglas Anthony

Classifications

• F23M20/005 Primary

  Noise absorbing means · 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

• F23R2900/00014

  Reducing thermo-acoustic vibrations by passive means, e.g. by Helmholtz resonators · CPC title

• F23R3/16

  with devices inside the flame tube or the combustion chamber to influence the air or gas flow · CPC title