MULTI-LOBED COOLING HOLE

• US 20140219815A1
• Filed: 09/28/2012
• Published: 08/07/2014
• Est. Priority Date: 02/15/2012
• Status: Active Grant

• Current Assignee: Rtx Corporation
• Original Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Kohli, Atul, Gleiner, Matthew S.
• Granted Patent: US 9,482,100 B2
• Time in Patent Office: Days
• US Class Current: 416/97.R
• CPC Class Codes: F01D 5/18 Hollow blades, i.e. blades with cooling or heating channels or cavities structure of hollow blades in general F01D5/147; Heating, heat-insulating or cooling means on blades
• CPC Class Codes: F01D 5/186 Film cooling F01D5/187 takes precedence
• CPC Class Codes: F01D 5/187 Convection cooling
• 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 2240/81 Cooled platforms
• CPC Class Codes: F05D 2250/73 asymmetric
• 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
• CPC Class Codes: F23R 3/06 Arrangement of apertures along the flame tube
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A gas turbine engine component subjected to a flow of high temperature gas includes a wall having first and second wall surfaces and a cooling hole extending through the wall. The cooling hole includes an inlet located at the first wall surface, an outlet located at the second wall surface, a metering section extending downstream from the inlet and a diffusing section extending from the metering section to the outlet. The diffusing section includes a first lobe, a second lobe and a transition region. The first lobe diverges longitudinally and laterally from the metering section and has a first shape. The second lobe is generally opposite the first lobe and diverges longitudinally and laterally from the metering section and has a second shape different from the first shape. The transition region is positioned between the first and second lobes and includes a downstream end adjacent the outlet.

Claims

1. A gas turbine engine component subjected to a flow of high temperature gas, the component comprising:

a wall having first and second wall surfaces; and

a cooling hole extending through the wall and comprising;

an inlet located at the first wall surface;

an outlet located at the second wall surface;

a metering section extending downstream from the inlet; and

a diffusing section extending from the metering section to the outlet and comprising;

a first lobe diverging longitudinally and laterally from the metering section and having a first shape;

a second lobe generally opposite the first lobe and diverging longitudinally and laterally from the metering section and having a second shape different from the first shape; and

a transition region positioned between the first and second lobes, the transition region comprising a downstream end adjacent the outlet.

2. The component of claim 1, wherein the metering section comprises a longitudinal axis, and wherein the longitudinal axis of the metering section is oriented radially at an angle between about 50°

and 90°

relative to an axis representing flow of the high temperature gas flowing past the component.

3. The component of claim 2, wherein the longitudinal axis of the metering section is oriented radially at an angle between about 60°

and 80°

relative to the axis representing flow of the high temperature gas.

4. The component of claim 1, wherein the first lobe forms a first flow volume and the second lobe forms a second flow volume.

5. The component of claim 4, wherein the first lobe is located upstream of the second lobe with respect to high temperature gas flowing past the component, and wherein the first flow volume is greater than the second flow volume.

6. The component of claim 4, wherein the first lobe is located upstream of the second lobe with respect to high temperature gas flowing past the component, and wherein the second flow volume is greater than the first flow volume.

7. The component of claim 1, wherein the metering section comprises a centerline axis, the first lobe comprises a first longitudinal axis and the second lobe comprises a second longitudinal axis, and wherein the first longitudinal axis is aligned with the centerline axis by a first angle, and wherein the second longitudinal axis is aligned with the centerline axis by a second angle different from the first angle.

8. The component of claim 1, wherein the metering section comprises a centerline axis, the first lobe comprises a first longitudinal axis and the second lobe comprises a second longitudinal axis, and wherein the first longitudinal axis is aligned with the centerline axis by a first angle, and wherein the second longitudinal axis is aligned with the centerline axis by a second angle that is equivalent to the first angle.

9. The component of claim 1, wherein the metering section comprises a centerline axis, the first lobe comprises a first longitudinal axis and the second lobe comprises a second longitudinal axis, and wherein one of the first and second longitudinal axes is coincident with the centerline axis.

10. A wall of a component of a gas turbine engine subjected to a flow of high temperature gas, the wall comprising:

first and second wall surfaces;

an inlet located at the first wall surface;

an outlet located at the second wall surface;

a metering section commencing at the inlet and extending downstream from the inlet; and

a diffusing section extending from the metering section and terminating at the outlet, the diffusing section comprising;

a first lobe diverging longitudinally and laterally from the metering section and having a first shape;

a second lobe generally opposite the first lobe and diverging longitudinally and laterally from the metering section and having a second shape different from the first shape; and

a transition region positioned between the first and second lobes, the transition region comprising a downstream end adjacent the outlet.

11. The wall of claim 10, wherein the metering section comprises a longitudinal axis, and wherein the longitudinal axis of the metering section is oriented radially at an angle between about 50°

and 90°

relative to an axis representing flow of the high temperature gas flowing past the component.

12. The wall of claim 11, wherein the longitudinal axis of the metering section is oriented radially at an angle between about 60°

and 80°

relative to the axis representing flow of the high temperature gas.

13. The wall of claim 10, wherein the first lobe forms a first flow volume and the second lobe forms a second flow volume.

14. The wall of claim 13, wherein the first lobe is located upstream of the second lobe with respect to high temperature gas flowing past the component, and wherein the first flow volume is greater than the second flow volume.

15. The wall of claim 13, wherein the first lobe is located upstream of the second lobe with respect to high temperature gas flowing past the component, and wherein the second flow volume is greater than the first flow volume.

16. The wall of claim 10, wherein the metering section comprises a centerline axis, the first lobe comprises a first longitudinal axis and the second lobe comprises a second longitudinal axis, and wherein the first longitudinal axis is aligned with the centerline axis by a first angle, and wherein the second longitudinal axis is aligned with the centerline axis by a second angle different from the first angle.

17. The wall of claim 10, wherein the metering section comprises a centerline axis, the first lobe comprises a first longitudinal axis and the second lobe comprises a second longitudinal axis, and wherein the first longitudinal axis is aligned with the centerline axis by a first angle, and wherein the second longitudinal axis is aligned with the centerline axis by a second angle that is equivalent to the first angle.

18. The wall of claim 10, wherein the metering section comprises a centerline axis, the first lobe comprises a first longitudinal axis and the second lobe comprises a second longitudinal axis, and wherein one of the first and second longitudinal axes is coincident with the centerline axis.