Device for cooling a wall of a component

Abstract

The present invention relates to a device for cooling a wall of a component, where a fluid flow flows parallel to the wall, with at least one inflow duct, the center axis of which being arranged inclined to the plane of the wall, with a groove provided in the wall, into which issues the inflow duct, where a wall of the groove is designed contoured downstream of a discharge opening of the inflow duct and has an inflow edge facing the discharge opening, characterized in that the groove extends on both sides of the discharge opening and adjacent to the inflow edge at an angle to the direction of the fluid flow, and has a narrowing width.

Claims

1. A device for cooling a wall of a component, where a fluid flow flows parallel to the wall, comprising: at least one inflow duct having a center axis arranged inclined to a surface of the wall and a discharge opening, a groove provided in the wall, into which the at least one inflow duct issues, wherein a wall of the groove is contoured downstream of the discharge opening of the at least one inflow duct and has an inflow edge facing the discharge opening, wherein the groove extends on both sides of the discharge opening and adjacent to the inflow edge at an angle to a direction of the fluid flow, and has a narrowing width, wherein the inflow edge is arranged at right angles to the surface of the wall.

2. The device in accordance with claim 1, wherein the groove has side walls and the side walls of the groove are provided at right angles to the surface of the wall.

3. The device in accordance with claim 1, wherein the groove has a constant depth.

4. The device in accordance with claim 1, and further including at least one chosen from the inflow duct having a circular cross-section and the discharge opening being elliptically shaped.

5. The device in accordance with claim 1, wherein the at least one inflow duct includes a plurality of inflow ducts with discharge openings arranged next to one another and transverse to the direction of the fluid flow, and further comprising a plurality of grooves provided in the wall, into which the plurality of inflow ducts issue, the plurality of grooves being connected to one another by at least one connecting groove.

6. The device in accordance with claim 5, wherein the at least one connecting groove extends at right angles to the direction of the fluid flow.

7. The device in accordance with claim 6, wherein the at least one connecting groove has a constant cross-section.

8. The device in accordance with claim 1, wherein the component is a turbine blade of a gas turbine.

9. The device in accordance with claim 1, wherein the component is a combustion chamber wall of a gas turbine.

10. The device in accordance with claim 5, wherein the at least one connecting groove has a constant cross-section.

11. A device for cooling a wall of a component, where a fluid flow flows parallel to the wall, comprising: at least one inflow duct having a center axis arranged inclined to a surface of the wall and a discharge opening, a groove provided in the wall, into which the at least one inflow duct issues, wherein a wall of the groove is contoured downstream of the discharge opening of the inflow duct and has an inflow edge facing the discharge opening, wherein the groove extends on both sides of the discharge opening and adjacent to the inflow edge at an angle to a direction of the fluid flow, and has a narrowing width, wherein the at least one inflow duct includes a plurality of inflow ducts with discharge openings arranged next to one another and transverse to the direction of the fluid flow, and further comprising a plurality of grooves provided in the wall, into which the plurality of inflow ducts issue, the plurality of grooves being connected to one another by at least one connecting groove, wherein the at least one connecting groove extends at right angles to the direction of the fluid flow.

12. The device in accordance with claim 11, wherein the at least one connecting groove has a constant cross-section.

13. The device in accordance with claim 12, wherein the groove has side walls and the side walls of the groove are provided at right angles to the surface of the wall.

14. The device in accordance with claim 12, wherein the groove has a constant depth.

15. The device in accordance with claim 12, wherein the component is a combustion chamber wall of a gas turbine.

16. A device for cooling a wall of a component, where a fluid flow flows parallel to the wall, comprising: at least one inflow duct having a center axis arranged inclined to a surface of the wall and a discharge opening, a groove provided in the wall, into which the at least one inflow duct issues, wherein a wall of the groove is contoured downstream of the discharge opening of the inflow duct and has an inflow edge facing the discharge opening, wherein the groove extends on both sides of the discharge opening and adjacent to the inflow edge at an angle to a direction of the fluid flow, and has a narrowing width, wherein the at least one inflow duct includes a plurality of inflow ducts with discharge openings arranged next to one another and transverse to the direction of the fluid flow, and further comprising a plurality of grooves provided in the wall, into which the plurality of inflow ducts issue, the plurality of grooves being connected to one another by at least one connecting groove, wherein the at least one connecting groove has a constant cross-section.

17. Device in accordance with claim 16, wherein the inflow edge is arranged at right angles to the surface of the wall.

18. Device in accordance with claim 17, wherein the side walls of the groove are provided at right angles to the surface of the wall.

19. Device in accordance with claim 17, wherein the groove has a constant depth.

20. The device in accordance with claim 17, wherein the component is a combustion chamber wall of a gas turbine.

Description

(1) The present invention is described in the following in light of the accompanying drawing showing an exemplary embodiment. In the drawing,

(2) FIG. 1 shows a simplified perspective partial view of a device in accordance with the present invention, and

(3) FIG. 2 shows a top view onto the exemplary embodiment illustrated in FIG. 1.

(4) The figures show in a schematic and simplified form a wall 1 of a component. The wall does not, as already mentioned, have to be designed flat. A fluid flow 7, for example a hot gas, flows along the wall. The component is for example part of a combustion chamber wall or part of a turbine blade. Several inflow ducts 2 issue into the surface of the wall 1 and have a substantially circular cross-section (not shown), and their center axes 3 are each arranged inclined to the surface of the wall 1. The result is thus elliptical discharge openings 5 through which cooling fluid (cooling air) 10 flows into a groove 4. As can be seen from FIG. 1 in particular, an inflow edge 6 is provided downstream of and opposite to the discharge opening 5. The downstream-arranged side wall 8 of the groove 4 is thus contoured and, facing the discharge opening 5, designed V-shaped when viewed from top, as can be seen from FIG. 2 in particular. It is evident that the two grooves laterally adjoining the discharge opening 5 are each designed and arranged symmetrically to the center axis 3 of the inflow duct 2.

(5) The groove 4 has in its longitudinal direction, starting from the discharge opening 5, a narrowing cross-section and merges into a connecting groove 9. This groove is, as can be seen from FIG. 2, arranged substantially at right angles to the hot fluid flow 7. The result is a wave-like or zig-zag-shaped course of the total groove, which is made up of the individual grooves 4 starting at the sides of the discharge openings 5 and of the respective connecting grooves 9.

(6) The lateral tapering or reduction of the cross-section of the groove 4 results in a constant mean flow velocity along the groove 4. The remaining cooling air exiting the groove 4 and flowing into the connecting groove 9 is also applied in an even manner onto the surface of the wall 1, as shown schematically by the cooling fluid flows 10 according to FIG. 2.

(7) The connecting grooves 9 have a constant cross-section and are, like the grooves 4, designed with side walls which are oriented at right angles to the surface of the wall 1 and hence to the fluid flow 7.

(8) As shown by FIG. 2 in particular, the grooves 4 are each arranged at an angle to the direction of the fluid flow 7 or to the outflow direction from the discharge opening 5. The result is an even lateral distribution of the cooling air. By adapting the cross-sections of the grooves 4 and of the connecting grooves 9, and by altering the angles in which the grooves 4 extend, optimization and adaptation to the respective component-related flow conditions are possible in accordance with the invention.

(9) The inflow edge 6 and the V-shaped or triangular design of the side walls of the adjacent grooves 4 lead to an optimized lateral deflection of the flow of the cooling fluid 10 and reduce the momentum of the cooling air jet exiting the discharge opening 5, so that vertical penetration into the main flow (fluid flow 7) is prevented or reduced. Due to the narrow design of the grooves 4 and of the connecting grooves 9, as provided in accordance with the invention, complete filling with cooling fluid is achieved, so that mixing with hot gas from the fluid flow 7, in particular in the area between the discharge openings 5, is prevented or reduced.

(10) It is possible in accordance with the invention to design the side walls 8 adjoining the inflow edge 6, the side walls 11 at the upstream rim area of the grooves 9 and the side walls 12 of the connecting groove 9 not at right angles but at an inclined angle to the surface of the wall 1 of the component. In accordance with the invention, differences and optimizations of the cross-sections of the grooves 4 and of the connecting grooves 9 are also possible.

LIST OF REFERENCE NUMERALS

(11) 1 Wall 2 Inflow duct 3 Center axis 4 Groove 5 Discharge opening 6 Inflow edge 7 Fluid flow 8 Side wall 9 Connecting groove 10 Cooling fluid 11, 12 Side wall