High frequency dynamics resonator assembly

• US 20050034918A1
• Filed: 08/15/2003
• Published: 02/17/2005
• Est. Priority Date: 08/15/2003
• Status: Active Grant

• Current Assignee: Siemens Energy Incorporated (Siemens AG)
• Original Assignee: Siemens Westinghouse Power Corporation
• Inventors: Ryan, William, Bland, Robert
• Granted Patent: US 7,080,514 B2
• Time in Patent Office: Days
• US Class Current: 181/250
• CPC Class Codes: F05B 2260/96 Preventing, counteracting or reducing vibration or noise
• CPC Class Codes: F23M 20/005 Noise absorbing means
• CPC Class Codes: F23R 2900/00014 Reducing thermo-acoustic vibrations by passive means, e.g. by Helmholtz resonators silence apparatus using resonance F01N1/023

Abstract

Aspects of the invention relate to resonator assemblies for use in non-uniform flow environments. The resonator assemblies include one or more features, such as a box or a scoop, for substantially equalizing the pressure on the resonator. In the box configuration, a box is attached on top of the resonator. The box has a top plate with a plurality of openings and at least one side wall extending from the entire periphery of the top plate. A plenum is defined between the box and the resonator plate. In the scoop configuration, a scoop is attached to the top of the resonator such that the scoop substantially overhangs the resonator. The scoop includes at least one side wall extending substantially perpendicularly therefrom, except for one side without a side wall so as to provide an opening into a space defined between the scoop and the resonator.

Claims

1. A resonator assembly comprising:

a resonator including a plate having a plurality of openings therein and at least one side wall extending from the periphery of the plate; and

a scoop including a top plate and at least one side wall extending substantially perpendicularly therefrom, the at least one side wall of the scoop attached to the resonator such that the scoop is disposed above the resonator and such that the top plate substantially overhangs the plate;

wherein the scoop includes one side without a side wall so as to provide an opening into a space defined between the scoop and the resonator plate;

whereby the scoop captures a passing fluid so as to substantially equalize the pressure impinging on the resonator plate.

2. The resonator assembly of claim 1 wherein the at least one side wall of the resonator extends substantially perpendicularly from the resonator plate.

3. The resonator assembly of claim 1 wherein the at least one side wall of the scoop is attached to the resonator by one of welding or brazing.

4. The resonator assembly of claim 1 wherein the top plate of the scoop and the resonator plate are spaced substantially equidistant.

5. The resonator assembly of claim 1 wherein the top plate of the scoop and the resonator plate are curved.

6. The resonator assembly of claim 1 wherein the spacing between the top plate of the scoop and the resonator plate is from about 1 millimeter to about 2 millimeters.

7. The resonator assembly of claim 1 wherein the resonator plate includes front and rear ends, the front and rear ends being disposed at different elevations.

8. The resonator assembly of claim 7 wherein the difference in elevation between the front and rear ends is from about 1 millimeter to about 3 millimeters.

9. The resonator assembly of claim 7 wherein the rear end of the resonator plate is disposed higher than the front end.

10. The resonator assembly of claim 7 wherein one side of the top plate of the scoop is attached to the rear end of the resonator plate such that the opening is at the front end.

11. The resonator assembly of claim 1 wherein the resonator and scoop include an axial length and a circumferential length, wherein the axial length is greater than the circumferential length.

12. The resonator assembly of claim 1 wherein the resonator and scoop include an axial length and a circumferential length, wherein the circumferential length is greater than the axial length.

13. The resonator assembly of claim 1 wherein the top plate of the scoop includes at least one opening.

14. A resonator assembly comprising:

a resonator including a plate having a plurality of openings therein and at least one side wall extending from the periphery of the plate; and

a box attached on top of the resonator, the box having a top plate and at least one side wall extending from the entire periphery of the top plate, wherein the top plate includes a plurality of openings;

wherein a plenum is defined between the box and the resonator plate, the plenum having a volume;

whereby a fluid entering the plurality of openings in the top plate of the box is substantially equalized in the plenum prior to impinging on the resonator plate.

15. The resonator assembly of claim 14 wherein the at least one side wall of the box extends substantially perpendicular away from the top plate.

16. The resonator assembly of claim 14 wherein the top plate of the box and the resonator plate are substantially identical.

17. The resonator assembly of claim 14 wherein the top plate of the box and the resonator plate are substantially equidistant.

18. The resonator assembly of claim 14 wherein the side walls of the resonator are attached to a turbine engine component so as to define a volume between the component and the resonator.

19. The resonator assembly of claim 18 wherein the plenum volume is less than the resonator volume.

20. The resonator assembly of claim 14 wherein the height of the box is from about ¼

to about ⅖

the height of the resonator.