Waffled impingement effusion method

• US 20060053798A1
• Filed: 09/10/2004
• Published: 03/16/2006
• Est. Priority Date: 09/10/2004
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Hadder, James L.
• Granted Patent: US 7,219,498 B2
• Time in Patent Office: Days
• US Class Current: 60/772
• CPC Class Codes: F23R 2900/00017 Assembling combustion chamber liners or subparts
• CPC Class Codes: F23R 2900/03044 Impingement cooled combustion chamber walls or subassemblies
• CPC Class Codes: F23R 3/007 constructed mainly of ceramic components
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A combined impingement effusion method comprises brazing or welding a waffled impingement plate to the cold back-side surface of component having effusion holes there through. The impingement plate comprises a plurality of small baffle cells to relieve the thermal stresses between the impingement plate and the component. By rigidly attaching the impingement plate, the cooling flow leakage associated with the seals of floating plates is avoided.

Claims

1. An apparatus for a component comprising:

a waffled impingement plate having at least one baffle cell, said baffle cell having a top portion and at least three side portions in contact with said top portion such that a cell cavity is formed; and

at least one impingement hole positioned in said waffled impingement plate, said impingement hole capable of providing a cooling flow to a cold backside surface of said component.

2. The apparatus of claim 1, wherein said top portion has an area of less than about 9.0 inch².

3. The apparatus of claim 1, wherein said impingement hole is in flow communication with an effusion hole of said component.

4. The apparatus of claim 1, wherein said waffled impingement plate comprises a plurality of hexagon shaped baffle cells.

5. The apparatus of claim 1, wherein said waffled impingement plate comprises at least one square shaped baffle cell having a plurality of impingement holes there through.

6. The apparatus of claim 1, wherein said waffled impingement plate conforms to the contour of at least a portion of said cold backside surface.

7. The apparatus of claim 1, wherein said waffled impingement plate comprises a plurality of nested baffle cells.

8. The apparatus of claim 1, wherein said component comprises a combustor liner.

9. The apparatus of claim 1, wherein said top portion has an area of between about 0.04 inch² and about 9.0 inch².

10. The apparatus of claim 1, wherein said waffled impingement plate comprises at least one alloying hole there through.

11. An apparatus for cooling a component comprising:

a waffled impingement plate conforming to at least a portion of a cold backside surface of said component, said waffled impingement plate comprising at least one baffle cell having at least one impingement hole there through, said baffle cell forming a cell cavity.

12. The apparatus of claim 11, wherein a height of said cell cavity is about three times a diameter of said impingement hole.

13. The apparatus of claim 11, wherein said baffle cell comprises a top portion and at least three side portions in contact with said top portion, each side portion having an outer end.

14. The apparatus of claim 13, wherein said top portion has an area of less than about 9.0 inch².

15. The apparatus of claim 13, wherein at least one outer end is capable of being brazed to said cold backside surface.

16. The apparatus of claim 13, wherein said top portion has an area of between about 0.04 inch² and about 9.0 inch².

17. The apparatus of claim 11, wherein said baffle cell comprises at least four outer ends capable of being attached to said cold back-side surface.

18. The apparatus of claim 11, wherein said baffle cell comprises six side portions.

19. The apparatus of claim 11, wherein said waffled impingement plate is capable of providing a cooling film on a hot side of said component.

20. The apparatus of claim 11, wherein said component comprises a combustor.

21. An apparatus for a component comprising:

a waffled impingement plate having at least one cell cavity and having at least one impingement hole there through, said waffled impingement plate conforming to a cold backside surface of said component.

22. The apparatus of claim 21, wherein said waffled impingement plate comprises a plurality of alloying holes.

23. The apparatus of claim 21, wherein said waffled impingement plate comprises a plurality of baffle cells, each baffle cell having a hexagon shaped top portion.

24. The apparatus of claim 21, wherein said waffled impingement plate comprises a sheet metal.

25. The apparatus of claim 21, wherein a height of said cell cavity is about three times a diameter of said impingement hole.

26. The apparatus of claim 21, wherein said component comprises an annular combustor liner.

27. The apparatus of claim 21, wherein said component comprises a can combustor.

28. An apparatus for a component comprising:

at least one waffled impingement plate comprising a plurality of baffle cells, at least one baffle cell having a top portion with an area of between about 0.04 inch² and about 9.0 inch²; and

at least one impingement hole positioned in said top portion.

29. The apparatus of claim 28, wherein said impingement hole has a diameter between about 0.01 and about 0.05 inches.

30. The apparatus of claim 28, wherein a hot side of said component comprises a thermal barrier coating.

31. An apparatus for a combustor liner comprising:

a waffled impingement plate having a plurality of baffle cells, at least one baffle cell having a top portion and six side portions connected to said top portion, said top portion having an area of less than about 9.0 inch² and a plurality of impingement holes there through, each side portion having an outer end capable of being attached to a cold backside surface of said combustor liner.

32. A method of cooling a component comprising the step of:

passing a cooling flow through at least one impingement hole of a waffled impingement plate, said waffled impingement plate attached to a cold backside surface of said component and comprising at least one baffle cell having a cell cavity, said step of passing such that said cooling flow enters said cell cavity, impinges on said cold backside surface and enters an effusion hole of said component.

33. The method of claim 32, wherein said step of passing provides a cooling film to a hot side of said component.

34. The method of claim 32, wherein said waffled impingement plate is brazed to said cold backside surface.

35. The method of claim 32, wherein said waffled impingement plate is welded to said cold backside surface.

36. The method of claim 32, wherein at least one said baffle cell has a top portion with an area of less than about 9.0 inch².