IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0205207
(2011-08-08)
|
등록번호 |
US-9022737
(2015-05-05)
|
발명자
/ 주소 |
- Piggush, Justin D.
- Kohli, Atul
|
출원인 / 주소 |
- United Technologies Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
17 |
초록
▼
An airfoil has a wall, a cooling channel, a trench, and a plurality of cooling holes. The wall has a leading edge, a trailing edge, a pressure side, a suction side, an outer diameter end, and an inner diameter end to define an interior. The cooling channel extends radially through the interior of th
An airfoil has a wall, a cooling channel, a trench, and a plurality of cooling holes. The wall has a leading edge, a trailing edge, a pressure side, a suction side, an outer diameter end, and an inner diameter end to define an interior. The cooling channel extends radially through the interior of the wall between the pressure side and the suction side and along the leading edge. The trench extends radially along an exterior of the wall at the leading edge and is recessed axially into the leading edge to form a back wall. The back wall is contoured to include at least one undulation. The plurality of cooling holes extends through the back wall of the trench to connect the interior of the wall at the cooling channel to the exterior.
대표청구항
▼
1. A turbine airfoil comprising: a wall having a leading edge, a trailing edge, a pressure side, a suction side, a tip end, and a root end, an interior surface and an exterior surface;a cooling channel defined by the interior surface that extends through the wall between the pressure side and the su
1. A turbine airfoil comprising: a wall having a leading edge, a trailing edge, a pressure side, a suction side, a tip end, and a root end, an interior surface and an exterior surface;a cooling channel defined by the interior surface that extends through the wall between the pressure side and the suction side;a trench extending in a spanwise direction along the exterior surface of the wall and being recessed from the exterior surface towards the interior surface to form a back wall, the back wall being contoured to include at least one undulation; anda plurality of cooling holes extending through the back wall of the trench to place the cooling channel in flow communication with the exterior surface, each cooling hole having a cross-sectional area and a centerline passing through a geometric center of the cross-sectional area, wherein at least one cooling hole is oriented such that a first angle defined between a centerline of the at least one cooling hole and a first tangent of the undulation is less than a second angle defined between the centerline of the at least one cooling hole and a second tangent passing through the undulation at its peak. 2. The turbine airfoil of claim 1 wherein the undulation positions a convex curvature between two of the plurality of cooling holes. 3. The turbine airfoil of claim 2 wherein the undulation positions a concave curvature between adjacent cooling holes and the convex curvature. 4. The turbine airfoil of claim 2 wherein the convex curvature extends further toward the exterior surface of the wall than the plurality of cooling holes. 5. The turbine airfoil of claim 2 wherein at least one of the plurality of cooling holes is angled in the spanwise direction. 6. The turbine airfoil of claim 2 wherein at least one of the plurality of cooling holes extends towards the tip end from the interior surface to the exterior surface. 7. The turbine airfoil of claim 6 wherein the convex curvature is positioned adjacent an exit aperture of one of the plurality of cooling holes toward the tip end. 8. The turbine airfoil of claim 2 wherein the convex curvature forms a smooth extension of one of the plurality of cooling holes. 9. The turbine airfoil of claim 8 wherein a portion of the convex curvature is aligned with an interior portion of one of the plurality of cooling holes. 10. The turbine airfoil of claim 1 wherein the trench comprises: a first side wall; anda second side wall;wherein the back wall is recessed from the exterior surface towards the interior surface of the wall by the first and second side walls. 11. The turbine airfoil of claim 10 wherein the first side wall is spaced from the second side wall a width such that the trench is centered on the leading edge of the wall. 12. The turbine airfoil of claim 1 wherein the undulation extends from the back wall towards the exterior surface of the wall such that cooling air leaving each of the plurality of cooling holes attaches along the back wall. 13. The turbine airfoil of claim 1 wherein the trench is disposed along the pressure side or the suction side of the wall. 14. The turbine airfoil of claim 1 and further comprising a plurality of trenches, each trench being contoured to include a series of undulations and having a plurality of cooling holes. 15. The turbine airfoil of claim 1 and wherein the plurality of cooling holes are arranged in a plurality of columns within the trench. 16. The turbine airfoil of claim 1 wherein the at least one cooling hole is substantially parallel to the first tangent of the undulation. 17. An airfoil, comprising: a body having an external wall surrounding an internal cavity, a spanwise extending leading edge, a spanwise extending trailing edge, a tip end, and a root end;a trench disposed in the external wall and extending in a spanwise direction, the trench having a first side wall, a second side wall, and a back wall extending between said first and second side walls; anda plurality of cooling apertures disposed within the trench and extending through the external wall to provide a cooling air passage between the internal cavity and the trench;wherein the back wall is contoured to provide protrusions between adjacent cooling apertures, and wherein each of the plurality of cooling apertures has a cross-sectional area and a centerline passing through a geometric center of the cross-sectional area, and wherein at least one cooling aperture is oriented such that the centerline of the at least one cooing aperture is substantially parallel to a tangent of an adjacent protrusion. 18. The airfoil of claim 17 wherein the contoured back wall includes a series of undulations extending in the spanwise direction along the trench. 19. The airfoil of claim 17 wherein the contoured back wall includes convex curvatures extending from an interior of at least one of the plurality of cooling apertures. 20. The airfoil of claim 17 wherein at least one of the cooling apertures is angled in the spanwise direction, the cooling aperture extending from the internal cavity to the trench. 21. The airfoil of claim 20 wherein the protrusions are positioned adjacent exits of the plurality of cooling apertures toward the tip end. 22. The airfoil of claim 16 wherein the protrusions extend towards the exterior wall to which cooling air leaving each of the plurality of cooling apertures attaches to the back wall. 23. The airfoil of claim 17 wherein the trench is disposed along the leading edge. 24. The airfoil of claim 17 wherein the external wall includes a plurality of trenches extending in the spanwise direction of the airfoil, each trench including a plurality of cooling apertures positioned along the back wall of the trench. 25. The airfoil of claim 17 wherein the plurality of cooling apertures includes multiple columns of cooling apertures extending in the spanwise direction along the back wall. 26. A hollow airfoil comprising: an external surface having a suction side, a pressure side, a leading edge, a trailing edge, a tip end, and a root end so as to form the airfoil;an internal cavity extending through the airfoil and into which cooling air is flowable from the root end of the airfoil;a trench disposed in the external surface and extending spanwise along the leading edge;a plurality of cooling holes extending from the internal cavity towards the tip end and through to the external surface within the trench, wherein each of the plurality of cooling holes has a cross-sectional area and a centerline passing through the geometric center of the cross-sectional area; anda plurality of convexities positioned in the trench adjacent a side of the cooling holes opposite the root end, wherein at least one cooling hole is oriented such that the centerline of the at least one cooling hole is substantially parallel to a tangent of at least one of the convexities. 27. The hollow airfoil of claim 26 wherein the plurality of convexities extend from a back wall of the trench towards the external surface such that cooling air leaving the plurality of cooling holes attaches to the plurality of convexities using a Coanda effect. 28. The hollow airfoil of claim 26 wherein the plurality of convexities form a series of undulations that are displaced in a spanwise direction from each other. 29. The hollow airfoil of claim 26 wherein the plurality of convexities form smooth extensions of the plurality of cooling holes in a direction of flow of the cooling air.
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