Cooled component

Patent metadata

Field	Value
Publication number	US-10927762-B2
Application number	US-201514858535-A
Country	US
Kind code	B2
Filing date	Sep 18, 2015
Priority date	Oct 2, 2014
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A cooled gas turbine engine component comprises a wall which has a plurality of effusion cooling apertures extending there-through from a first surface to a second surface. The apertures are arranged at an angle to the second surface and each aperture has an inlet in the first surface and an outlet in the second surface. Each aperture has a metering portion and a diffusing portion arranged in flow series and each metering portion is elongate and the width is greater than the length of the metering portion. Each diffusing portion increases in dimension in the length from the metering portion to the outlet. Each outlet has a rectangular shape in the second surface of the wall. Each inlet has an elongate shape in the first surface of the wall and the inlet in the wall is arranged substantially diagonally with respect to the outlet in the wall.

First claim

The invention claimed is:

1. A cooled component comprising:
a wall having a first surface, a second surface, and a thickness between the first surface and the second surface, wherein:
the wall has a plurality of effusion cooling apertures extending there-through from the first surface to the second surface, the plurality of effusion cooling apertures being arranged at an angle with respect to the second surface;
each effusion cooling aperture has (i) an inlet in the first surface, (ii) an outlet in the second surface, and (iii) a metering portion and a diffusing portion arranged in flow series from the inlet to the outlet;
each metering portion is elongate and, in a cross-section perpendicular to the first and second surfaces, has a height in a direction parallel to the thickness and a width in a lateral direction perpendicular to the height that is greater than the height;
in a longitudinal direction parallel to the first and second surfaces and perpendicular to the lateral direction, each outlet has an increased length compared to a length of the inlet, each outlet also having a quadrilateral shape in the second surface of the wall;
each inlet has an elongate shape in the first surface of the wall and has a longitudinal axis in the first surface that is arranged diagonally relative to edges connecting corners of the outlets;
each inlet has (i) an upstream end wall upstream in a direction of air flow over the first surface, (ii) a downstream end wall downstream of the upstream end wall in the direction of air flow, and (iii) side walls connecting the upstream and downstream end walls, one of the side walls being upstream of the other of the side walls in the direction of air flow, and a downstream end of the upstream side wall being upstream of an upstream end of the downstream side wall in the direction of air flow; and
the metering portion of each effusion cooling aperture gradually changes the effusion cooling aperture from the elongate, diagonally-arranged shape at the inlet to a quadrilateral shape at a junction of the metering portion and the diffusing portion of the effusion cooling aperture.

2. The cooled component of claim 1 , wherein each outlet has a shape selected from one of: a rhombus shape and an isosceles trapezium shape.

3. The cooled component of claim 1 , wherein each outlet has a rectangular shape, two sides of the rectangular shape extending laterally and two sides of the rectangular shape extending longitudinally.

4. The cooled component of claim 2 , wherein each outlet is arranged such that two sides of the shape extend laterally and two sides of the shape extend longitudinally and laterally.

5. The cooled component of claim 1 , wherein:
the upstream end wall is concave, the downstream end wall is convex, and the side walls are each concave.

6. The cooled component of claim 5 , wherein the upstream and downstream end walls diverge in the longitudinal, axial, direction of the wall.

7. The cooled component of claim 1 , wherein the plurality of effusion cooling apertures are arranged in longitudinally spaced rows and the effusion cooling apertures in each row are laterally spaced apart.

8. The cooled component of claim 7 , wherein the plurality of effusion cooling apertures in each row are offset laterally from the effusion cooling apertures in each adjacent row.

9. The cooled component of claim 1 , wherein a ratio of the width of each metering portion to the height of the metering portion is from 3 to 1 to 8 to 1.

10. The cooled component of claim 1 , wherein each metering portion is arranged at an angle of between 10° and 20° to the first surface.

11. The cooled component of claim 1 , wherein:
the height of the metering portion of each of the plurality of effusion cooling apertures is 0.3 mm, the width of the metering portion is 0.9 mm, and the metering portion is arranged at an angle of 12° to the first surface of the wall;
a first surface of the diffusing portion of each of the plurality of effusion cooling apertures is arranged at an angle of 12° to the second surface of the wall; and
a second opposite surface of the diffusing portion of each of the plurality of effusion cooling apertures is arranged at an angle of 7° to the first surface of the diffusing portion to form the diffusing portion.

12. The cooled component of claim 1 , wherein:
the height of the metering portion of each of the plurality of effusion cooling apertures is 0.3 mm, the width of the metering portion is 0.9 mm, and the metering portion is arranged at an angle of 17° to the first surface of the wall;
a first surface of the diffusing portion of each of the plurality of effusion cooling apertures is arranged at an angle of 17° to the second surface of the wall; and
a second opposite surface of the diffusing portion of each of the plurality of effusion cooling apertures is arranged at an angle of 6° to the first surface of the diffusing portion to form the diffusing portion.

13. The cooled component of claim 1 , further comprising a second wall, wherein:
the second wall has a third surface and a fourth surface, the fourth surface being spaced apart from the first surface of the wall; and
the second wall has a plurality of impingement cooling apertures extending there-through from the third surface to the fourth surface.

14. The cooled component of claim 13 , wherein:
the height of the metering portion of each of the plurality of effusion cooling apertures is 0.3 mm, the width of the metering portion is 2.4 mm, and the metering portion is arranged at an angle of 16° to the first surface of the wall;
a first surface of the diffusing portion of each of the effusion cooling apertures is arranged at an angle of 16° to the second surface of the wall; and
a second opposite surface of the diffusing portion is arranged at an angle of 6° to the first surface of the diffusing portion to form the diffusing portion.

15. The cooled component of claim 1 , wherein the cooled component is selected from the group consisting of: a turbine blade, a turbine vane, a combustion chamber wall, a combustion chamber tile, a combustion chamber heat shield, a combustion chamber wall segment and a turbine shroud.

16. The cooled component of claim 15 , wherein:
the cooled component is an annular combustion chamber wall; and
each outlet of the annular combustion chamber wall has a rectangular shape, two sides of the rectangular shape extending circumferentially of the combustion chamber wall and two sides of the rectangular shape extending axially of the combustion chamber wall.

17. The cooled component of claim 15 , wherein:
the cooled component is a combustion chamber tile for an annular combustion chamber wall; and
each outlet of the combustion chamber tile has the quadrilateral shape, two sides of the shape extending circumferentially of the combustion chamber tile and two sides of the shape extending axially of the combustion chamber tile.

18. The cooled component of claim 15 , wherein:
the cooled component is a combustion chamber wall segment for an annular combustion chamber wall;
the combustion chamber wall segment comprises an outer wall and an inner wall spaced apart from the outer wall, the outer wall having a plurality of impingement cooling apertures and the inner wall having the plurality of effusion cooling apertures; and
each outlet of the effusion cooling apertures of the inner wall is arranged such that two sides of the quadrilateral shape extend in a circumferential direction of the combustion chamber wall segment and two sides of the quadrilat

Assignees

• Rolls Royce Plc

Inventors

• Harding Stephen Charles
• Worth Nicholas Alexander

Classifications

• F01D5/186 Primary

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

• F05D2260/201

  by impingement of a fluid · CPC title

• F23R2900/03042

  Film cooled combustion chamber walls or domes · CPC title

• F23R3/002

  Wall structures (F23R3/02 and F23R3/007 take precedence) · CPC title

• F05D2250/13

  trapezoidal · CPC title