Damping device for reducing the vibration amplitude of acoustic waves for a burner

• US 6,370,879 B1
• Filed: 11/02/1999
• Issued: 04/16/2002
• Est. Priority Date: 11/10/1998
• Status: Expired due to Fees

• Current Assignee: Alstom SA
• Original Assignee: Alstom SA
• Inventors: Joos, Franz, Stalder, Marcel
• Primary Examiner(s): Argenbright, Tony M.
• Assistant Examiner(s): HUYNH, HAI H
• Application Number:
  US09/431,918
• Time in Patent Office: 896 Days
• Field of Search: 123/192.1, 123/184.57, 123/184.53, 181/214, 181/229, 181/240, 507/25, 431/114
• US Class Current: 60/725
• CPC Class Codes: F05B 2260/96 Preventing, counteracting or reducing vibration or noise
• CPC Class Codes: F23C 2900/07002 Premix burners with air inlet slots obtained between offset curved wall surfaces, e.g. double cone burners
• CPC Class Codes: F23D 14/46 Details , e.g. noise reduction means
• CPC Class Codes: F23D 2210/00 Noise abatement
• CPC Class Codes: F23R 2900/00014 Reducing thermo-acoustic vibrations by passive means, e.g. by Helmholtz resonators
• CPC Class Codes: F23R 3/286 having fuel-air premixing devices F23R3/30 takes precedence

Abstract

A damping device for reducing the vibration amplitude of acoustic waves and a burner for operating an internal combustion engine, the burner having a mixing region, in which an air flow and a fuel flow are mixed with one another to form an air/fuel mixture, and a combustion chamber, which in the direction of flow of the fuel/air mixture is arranged downstream of the mixing region, in which the fuel/air mixture can be ignited. A Helmholtz resonator directly connected to the mixing region of the burner such that acoustic waves formed in the burner are suppressed in the Helmholtz resonator and are not reflected back into the burner.

Claims

1. A damping device for reducing the vibration amplitude of acoustic waves in an internal combustion engine, said device comprising:

a burner for operating an internal combustion engine, said burner having;

a mixing region, in which an air flow and a fuel flow are mixed with one another to form an air/fuel mixture, and

a combustion chamber, which in the direction of flow of the fuel/air mixture is arranged downstream of the mixing region, in which the fuel/air mixture can be ignited; and

a Helmholtz resonator directly connected to the mixing region of the burner, such that, acoustic waves which are formed in the burner are suppressed in the Helmholtz resonator and are not reflected back into the burner.

2. A damping device according to claim 1, wherein the Helmholtz resonator is arranged upstream of the mixing region in the direction of flow of the fuel/air mixture.

3. A damping device according to claim 1, wherein said mixing region is conically designed, wherein the combustion chamber adjoins the largest diameter of said conically designed mixing region and the Helmholtz resonator is attached to the smallest diameter of said mixing region.

4. A damping device according to claim 3, wherein a fuel feed line and/or oil nozzles are provided between said Helmholtz resonator and said mixing region.

5. A damping device according to claim 4, wherein the fuel feed line is for the feeding of pilot gas.

6. A damping device according to claim 1, wherein the Helmholtz resonator is arranged so as to be displaceable relative to the mixing region in order to permit frequency tuning with a closed volume of the Helmholtz resonator.

7. A damping device according to claim 1, wherein a casing surrounds the burner.

8. A damping device according to claim 7, wherein the Helmholtz resonator is arranged inside the casing.

9. A damping device according to claim 7, wherein the Helmholtz resonator is arranged outside the casing.

10. A damping device according to claim 1, wherein the mixing region is designed as a swirl generator, within which a fuel/air mixture whirling about an axis forms.

11. A damping device for reducing the vibration amplitude of acoustic waves in an internal combustion engine, said device comprising:

a burner for operating an internal combustion engine, said burner having;

a mixing region, in which an air flow and a fuel flow are mixed with one another to form an air/fuel mixture, and

a combustion chamber, which in the direction of flow of the fuel/air mixture is arranged downstream of the mixing region, in which the fuel/air mixture can be ignited; and

wherein a quarter-wave tube is used for reducing the vibration amplitude of acoustic waves.