Film cooling channel array with multiple metering portions

Patent metadata

Field	Value
Publication number	US-9309771-B2
Application number	US-201213660132-A
Country	US
Kind code	B2
Filing date	Oct 25, 2012
Priority date	Oct 25, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A cooling channel array for a gas turbine engine is provided. The cooling channel array is carried by a component wall having an inner surface and an outer surface and comprises at least two metering portions that communicate with a diffusion cavity.

First claim

What is claimed is:

1. A cooling channel array carried by a component wall of a gas turbine engine, the component wall having a first surface and a second surface, the cooling channel array comprising:
a diffusion cavity defined by a face carried by the component wall, the diffusion cavity defining a central axis and having an outlet on the second surface, the face having at least two side surfaces;
a metering section comprising at least two metering portions that merge into the diffusion cavity, each metering portion extending from an inlet located on the first surface to a metering portion outlet located on the face of the diffusion cavity;
a convex raised contoured bottom surface on the face of the diffusion cavity, between the side surfaces, and below the second surface, the raised contoured surface forming a corner with the face and being separated from the second surface by the face; and
at least two slightly convex lower side surfaces, each slightly convex lower side surface being between the convex raised contoured bottom surface and one of the side surfaces of the face, respectively forming a straight groove with one of the side surfaces of the face, and respectively forming a curved edge with the convex raised contoured bottom surface, each curved edge curving convexly toward the central axis.

2. The cooling channel array of claim 1 wherein at least one of the metering portions has a constant flow cross-sectional area.

3. The cooling channel array of claim 1 wherein at least one of the metering portions has a circular flow cross-sectional area.

4. The cooling channel array of claim 3 wherein:
each metering portion has a diameter and a length at least three times the diameter.

5. The cooling channel array of claim 1 wherein at least one of the metering portions has an oval flow cross-sectional area.

6. The cooling channel array of claim 1 wherein:
the diffusion cavity is downstream of the metering portions; and
the diffusion cavity is configured to diffuse cooling air away from the central axis in a lateral direction before the air exits the cooling channel array.

7. The cooling channel array of claim 1 wherein the diffusion cavity outlet is defined by a rounded triangular perimeter comprising a relatively straight trailing edge and two opposing lateral edges that extend from each end of the trailing edge and converge at an apex.

8. The cooling channel array of claim 1 wherein the metering portions are substantially parallel to each other.

9. The cooling channel array of claim 1 wherein the metering portions are not parallel to each other.

10. The cooling channel array of claim 1 wherein at least two metering portions have different diameters.

11. The cooling channel array of claim 1 wherein the component wall is part of a turbine blade.

12. The cooling channel array of claim 1 wherein the diffusion cavity comprises two or more lobes.

13. The cooling channel array of claim 12 wherein the number of metering portions is equal to the number of lobes.

14. A cooling channel array carried by a component wall of a gas turbine engine, the component wall having a first surface and a second surface, the cooling channel array comprising:
a diffusion cavity defined by a face carried by the component wall, the diffusion cavity defining a central axis and having an outlet on the second surface, the face having at least two side surfaces;
a convex raised contoured bottom surface in the diffusion cavity on the face and below the second surface, the raised contoured bottom surface forming a corner with the face, being separated from the second surface by the face;
at least two slightly convex lower side surfaces, each slightly convex lower side surface being between the convex raised contoured bottom surface and one of the side surfaces of the face, respectively forming a straight groove with one of the side surfaces of the face, and respectively forming a curved edge with the convex raised contoured bottom surface, each curved edge curving convexly toward the central axis; and
a metering section comprising at least two metering portions that communicate with the diffusion cavity, each metering portion extending from an inlet located on the first surface to a metering portion outlet located on the face of the diffusion cavity; wherein
the diffusion cavity comprises two or more lobes, each lobe partly defined by the convex raised contoured bottom surface.

15. The cooling channel array of claim 14 wherein:
at least one of the lobes defines a lobe axis that diverges from the central axis.

16. The cooling channel array of claim 14 wherein:
the diffusion cavity outlet is defined by a perimeter having a relatively straight trailing edge;
one lobe is at least partly defined by one of the side surfaces and one of the slightly convex lower side surfaces and terminates at the trailing edge; and
the other lobe is at least partly defined by the other side surface and the other slightly convex lower side surface and terminates at the trailing edge.

17. The cooling channel array of claim 14 wherein the number of metering portions equals the number of lobes.

18. The cooling channel array of claim 17 wherein the number of metering portions is two.

19. The cooling channel array of claim 17 wherein each lobe defines a lobe axis and each metering portion is fluidly aligned with a lobe axis.

Assignees

• United Technologies Corp

Inventors

• Xu Jinquan
• Levasseur Glenn

Classifications

• F05D2260/202

  by film cooling · CPC title

• F05D2240/81

  Cooled platforms · CPC title

• F01D5/186 Primary

  Film cooling (F01D5/187 takes precedence) · CPC title

• F23R2900/03042

  Film cooled combustion chamber walls or domes · CPC title

• F01D9/065

  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 title