TURBINE ENGINE COMPONENT WITH DIFFUSER HOLES

• US 20160273364A1
• Filed: 03/18/2015
• Published: 09/22/2016
• Est. Priority Date: 03/18/2015
• Status: Active Grant

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: BERGHOLZ, Robert Frederick
• Granted Patent: US 10,030,525 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F01D 5/186 Film cooling F01D5/187 takes precedence
• CPC Class Codes: F01D 9/065 Fluid supply or removal conduits traversing the working fluid flow, e.g. for lubrication-, cooling-, or sealing fluids see also F01D25/16, F01D25/24 and F01D25/26
• CPC Class Codes: F05D 2240/11 Shroud seal segments
• CPC Class Codes: F05D 2240/81 Cooled platforms
• CPC Class Codes: F05D 2250/21 pyramidal
• CPC Class Codes: F05D 2250/23 prismatic
• CPC Class Codes: F05D 2260/202 by film cooling
• CPC Class Codes: F23R 2900/03042 Film cooled combustion chamber walls or domes
• CPC Class Codes: F23R 3/002 Wall structures F23R3/02 and F23R3/007 take precedence

Abstract

A turbine component includes a component wall with inner and outer surfaces wherein a diffuser hole passes through the component wall between the inner surface and the outer surface. The diffuser hole has a hole axis and includes: a metering section extending from an inlet at the inner surface to a junction plane between the inner and outer surfaces; and a diffuser section extending from the junction plane to an outlet at the outer surface, and increasing in flow area from the junction plane to the outlet, the diffuser section having an upstream portion defining a first area ratio and a downstream portion defining a second area ratio different from the second area ratio.

Claims

1. A turbine component having a component wall with inner and outer surfaces wherein a diffuser hole passes through the component wall between the inner surface and the outer surface, the diffuser hole having a hole axis and comprising:

a metering section extending from an inlet at the inner surface to a junction plane between the inner and outer surfaces; and

a diffuser section extending from the junction plane to an outlet at the outer surface, and increasing in flow area from the junction plane to the outlet, the diffuser section having an upstream portion defining a first area ratio and a downstream portion defining a second area ratio different from the second area ratio.

2. The component of claim 1 wherein the diffuser section is defined by an outer wall adjacent the outer surface, an inner wall adjacent the inner surface, and a pair of spaced-apart side walls extending between the inner and outer walls.

3. The component of claim 2 wherein the outer wall, inner wall, and side walls merge together into one continuous peripheral wall at the junction plane.

4. The component of claim 2 wherein:

the side walls diverge away from the hole axis at a side diffusion angle, measured in a plane parallel to the outer surface of the component wall;

the inner wall diverges away from the hole axis at a layback angle measured in a plane perpendicular to the outer surface of the component wall; and

the side walls define a first side diffusion angle within the upstream portion, and a second diffusion angle different from the first diffusion angle within the downstream portion.

5. The component of claim 4 wherein the inner wall defines a first layback angle within the upstream portion, and a second layback angle different from the first layback angle within the downstream portion.

6. The component of claim 2 wherein:

the side walls diverge away from the hole axis at a side diffusion angle, measured in a plane parallel to the outer surface of the component wall;

the inner wall diverges away from the hole axis at a layback angle measured in a plane perpendicular to the outer surface of the component wall; and

the inner wall defines a first layback angle within the upstream portion, and a second layback angle different from the first layback angle within the downstream portion.

7. The component of claim 2 wherein the diffuser section includes a pair of laterally-symmetrical wings, each wing interconnecting the outer wall and one of the side walls.

8. The component of claim 7 wherein each wing has an aft edge extending at an acute angle to the hole axis.

9. The component of claim 8 wherein the aft edges of the two wings form a V-shape with a concave curve at its apex.

10. The component of claim 2 wherein the diffuser section includes a diffuser plug extending radially outward from the inner wall, laterally centered on the hole axis.

11. The component of claim 10 wherein the diffuser plug includes an upstream face, a downstream face, and a pair of spaced-apart lateral faces that extend axially between the upstream face and the downstream face.

12. The component of claim 11 wherein the lateral faces are angled towards each other and meet at a radiused peak, and the downstream face slopes aftward from the aft end of the peak, to the inner wall.

13. The component of claim 12 wherein the diffuser plug terminates axially upstream of the outlet of the diffuser hole.

14. The component of claim 10 wherein two diffuser holes are disposed side-by-side, with a lateral spacing between the two diffuser holes selected such that a side wall of one diffuser hole merges with a side wall of the adjacent diffuser hole.

15. The component of claim 14 wherein the merged side walls are displaced axially forward from a common outlet.

16. A turbine component having a component wall with inner and outer surfaces wherein a diffuser hole passes through the component wall between the inner surface and the outer surface, the diffuser hole having a hole axis and comprising:

a metering section extending from an inlet at the inner surface to a junction plane between the inner and outer surfaces; and

a diffuser section extending from the junction plane to an outlet at the outer surface, and increasing in flow area from the junction plane to the outlet, the diffuser section having an upstream portion defining a first area ratio and a downstream portion defining a second area ratio different from the second area ratio;

wherein the diffuser section is defined by an outer wall adjacent the outer surface, an inner wall adjacent the inner surface, and a pair of spaced-apart side walls extending between the inner and outer walls;

the diffuser section includes a diffuser pedestal extending radially outwardly from the inner wall, so as to effectively divides the aft portion of the diffuser section into two separate legs.

17. The component of claim 16 wherein the diffuser pedestal includes a generally wedge-shaped downstream face which lies in plane with the outer surface of the component wall, and a pair of spaced-apart lateral faces that extend axially forward from the downstream face.

18. The component of claim 17 wherein the lateral faces are angled towards each other and meet to form a leading edge that extends from the downstream face to the inner wall.

19. The component of claim 18 wherein the leading edge terminates aft of an aft edge of the outer wall.

20. The component of claim 16 wherein the outer wall, inner wall, and side walls merge together into one continuous peripheral wall at the junction plane.

21. The component of claim 16 wherein:

the side walls diverge away from the hole axis at a side diffusion angle, measured in a plane parallel to the outer surface of the component wall;

the inner wall diverges away from the hole axis at a layback angle measured in a plane perpendicular to the outer surface of the component wall; and

the side walls define a first side diffusion angle within the upstream portion, and a second diffusion angle different from the first diffusion angle within the downstream portion.

22. The component of claim 21 wherein the inner wall defines a first layback angle within the upstream portion, and a second layback angle different from the first layback angle within the downstream portion.

23. The component of claim 16 wherein:

the side walls diverge away from the hole axis at a side diffusion angle, measured in a plane parallel to the outer surface of the component wall;

the inner wall diverges away from the hole axis at a layback angle measured in a plane perpendicular to the outer surface of the component wall; and

the inner wall defines a first layback angle within the upstream portion, and a second layback angle different from the first layback angle within the downstream portion.

24. The component of claim 16 wherein the diffuser section includes a pair of laterally-symmetrical wings, each wing interconnecting the outer wall and one of the side walls.

25. The component of claim 24 wherein each wing has an aft edge extending at an acute angle to the hole axis.

26. The component of claim 25 wherein the aft edges of the two wings form a V-shape with a concave curve at its apex.