초록 ▼

A turbine airfoil comprises a wall portion, a cooling channel, a plurality of trip strips and a plurality of pedestals. The wall portion comprises a leading edge, a trailing edge, a pressure side and a suction side. The cooling channel is for receiving cooling air and extends radially through an int

A turbine airfoil comprises a wall portion, a cooling channel, a plurality of trip strips and a plurality of pedestals. The wall portion comprises a leading edge, a trailing edge, a pressure side and a suction side. The cooling channel is for receiving cooling air and extends radially through an interior of the wall portion between the pressure side and the suction side. The plurality of trip strips line the wall portion inside the cooling channel along the pressure side and the suction side. Each of the pedestals is an elongate, tapered pedestal having a curved leading edge. The plurality of pedestals is interposed within the trip strips and connects the pressure side with the suction side.

대표청구항 ▼

1. A turbine airfoil comprising: a wall portion comprising: a leading edge;a trailing edge;a pressure side; anda suction side;a cooling channel for receiving cooling air extending radially through an interior of the wall portion between the pressure side and the suction side;a plurality of trip stri

1. A turbine airfoil comprising: a wall portion comprising: a leading edge;a trailing edge;a pressure side; anda suction side;a cooling channel for receiving cooling air extending radially through an interior of the wall portion between the pressure side and the suction side;a plurality of trip strips lining the wall portion inside the cooling channel along the pressure side and the suction side; anda plurality of elongate, tapered pedestals having curved leading edges interposed within the trip strips and connecting the pressure side with the suction side. 2. The turbine airfoil of claim 1 wherein the pedestals are ice-cream-cone-shaped. 3. The turbine airfoil of claim 1 wherein the ice-cream-cone-shaped pedestals comprise: a rounded leading edge having a first radius of curvature;a rounded trailing edge having a second radius of curvature less than the first radius of curvature; andfirst and second tangent edges extending straight between the rounded leading edge and the rounded trailing edge. 4. The turbine airfoil of claim 3 wherein: the rounded leading edge is partially blunted at a tip of the leading edge along a portion of a circumference of the first radius of curvature; andthe rounded trailing edge is partially blunted at a tip of the trailing edge along a portion of a circumference of the second radius of curvature. 5. The turbine airfoil of claim 1 wherein each ice-cream-cone-shaped pedestal extends between a leading edge and a trailing edge of the pedestal, the pedestal decreasing in radial height as the pedestal extends from the leading edge to the trailing edge. 6. The turbine airfoil of claim 5 wherein the ice-cream-cone-shaped pedestals comprise: an arcuate leading edge wall;an arcuate trailing edge wall; andfirst and second side edge walls extending straight between the rounded leading edge wall and the rounded trailing edge wall. 7. The turbine airfoil of claim 6 wherein the arcuate leading edge and the arcuate trailing edge are parabolic or elliptical. 8. The turbine airfoil of claim 1 and further comprising a plurality of ribs extending generally axially and positioned radially between adjacent ice-cream-cone-shaped pedestals. 9. The turbine airfoil of claim 8 wherein the plurality of trip strips comprise: a first array of zigzag shaped trip strips extending in a radial direction along the suction side; anda second array of zigzag shaped trip strips extending in a radial direction along the pressure side;wherein the first and second arrays of zigzag trip strips extend through the plurality of ribs. 10. The turbine airfoil of claim 8 wherein the plurality of trip strips comprise: a first plurality of rows of chevron shaped trip strips extending radially between adjacent ribs on the suction side; anda second plurality of rows of chevron shaped trip strips extending radially between adjacent ribs on the pressure side. 11. The turbine airfoil of claim 8 and further comprising a plurality of fins disposed at the trailing edge of the wall portion and connecting the pressure side and the suction side to form a plurality of trailing edge slots. 12. A turbine airfoil comprising: a wall having 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 chamber;a divider extending radially between the inner diameter end and the outer diameter end of the wall within the interior chamber to define a cooling channel; anda trailing edge cooling system positioned downstream of the cooling channel, the trailing edge cooling system including: a first grouping of trip strips lining the pressure side;a second grouping of trip strips lining the suction side; anda plurality of teardrop-shaped pedestals interposed within the trip strips, connected to the pressure side and the suction side, oriented generally in an axial direction, and configured to receive fluid flow from the cooling channel. 13. The turbine airfoil of claim 12 wherein the trailing edge cooling system further comprises: a plurality of ribs connected to the pressure side and suction side and extending generally in an axial direction and positioned radially between adjacent teardrop-shaped pedestals. 14. The turbine airfoil of claim 13 wherein the trailing edge cooling system further comprises: a plurality of fins connected to the pressure side and the suction side and oriented generally in an axial direction and positioned downstream of the plurality of teardrop-shaped pedestals so as to be configured to receive fluid flow from the teardrop-shaped pedestals. 15. The turbine airfoil of claim 13 wherein each grouping of trip strips comprises zigzag shaped trip strips extending radially across the ribs and teardrop-shaped pedestals. 16. The turbine airfoil of claim 13 wherein each grouping of trip strips comprises a plurality of rows of chevron shaped trip strips positioned radially between adjacent ribs and oriented with an apex of each chevron pointed upstream. 17. The turbine airfoil of claim 12 wherein each of the teardrop-shaped pedestals comprises: a rounded leading edge having a first radius of curvature;a rounded trailing edge having a second radius of curvature less than the first radius of curvature; andfirst and second tangent edges extending straight between the rounded leading edge and the rounded trailing edge. 18. The turbine airfoil of claim 17 wherein: the rounded leading edge is partially blunted at a tip of the leading edge along a portion of a circumference of the first radius of curvature; andthe rounded trailing edge is partially blunted at a tip of the trailing edge along a portion of a circumference of the second radius of curvature. 19. The turbine airfoil of claim 12 wherein each teardrop-shaped pedestal extends between a leading edge and a trailing edge of the pedestal, the pedestal decreasing in radial height as the pedestal extends from the leading edge to the trailing edge. 20. The turbine airfoil of claim 19 wherein each of the teardrop-shaped pedestals comprises: an arcuate leading edge wall;an arcuate trailing edge wall; andfirst and second side edge walls extending straight between the rounded leading edge wall and the rounded trailing edge wall. 21. A turbine airfoil comprising: a wall having 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 chamber;a divider extending radially between the inner diameter end and the outer diameter end of the wall within the interior chamber to define a cooling channel; anda trailing edge cooling system positioned downstream of the cooling channel, the trailing edge cooling system including: a plurality of teardrop-shaped pedestals interposed within the trip strips, connected to the pressure side and the suction side, oriented generally in an axial direction, and configured to receive fluid flow from the cooling channel;a first grouping of trip strips lining the pressure side;a second grouping of trip strips lining the suction side; anda plurality of ribs connected to the pressure side and suction side and extending generally in an axial direction and positioned radially between adjacent teardrop-shaped pedestals. 22. The turbine airfoil of claim 21 wherein the trailing edge cooling system further comprises: a plurality of fins connected to the pressure side and the suction side and oriented generally in an axial direction and positioned downstream of the plurality of teardrop-shaped pedestals so as to be configured to receive fluid flow from the teardrop-shaped pedestals. 23. The turbine airfoil of claim 21 wherein each grouping of trip strips comprises zigzag shaped trip strips extending radially across the ribs and teardrop-shaped pedestals. 24. The turbine airfoil of claim 21 wherein each grouping of trip strips comprises a plurality of rows of chevron shaped trip strips positioned radially between adjacent ribs and oriented with an apex of each chevron pointed upstream. 25. The turbine airfoil of claim 21 wherein each of the teardrop-shaped pedestals comprises: a rounded leading edge having a first radius of curvature;a rounded trailing edge having a second radius of curvature less than the first radius of curvature; andfirst and second tangent edges extending straight between the rounded leading edge and the rounded trailing edge. 26. The turbine airfoil of claim 25 wherein: the rounded leading edge is partially blunted at a tip of the leading edge along a portion of a circumference of the first radius of curvature; andthe rounded trailing edge is partially blunted at a tip of the trailing edge along a portion of a circumference of the second radius of curvature. 27. The turbine airfoil of claim 21 wherein each teardrop-shaped pedestal extends between a leading edge and a trailing edge of the pedestal, the pedestal decreasing in radial height as the pedestal extends from the leading edge to the trailing edge. 28. The turbine airfoil of claim 27 wherein each of the teardrop-shaped pedestals comprises: an arcuate leading edge wall;an arcuate trailing edge wall; andfirst and second side edge walls extending straight between the rounded leading edge wall and the rounded trailing edge wall. 29. A turbine airfoil comprising: a wall having 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 chamber;a divider extending radially between the inner diameter end and the outer diameter end of the wall within the interior chamber to define a cooling channel; anda trailing edge cooling system positioned downstream of the cooling channel, the trailing edge cooling system including: a plurality of teardrop-shaped pedestals interposed within the trip strips, connected to the pressure side and the suction side, oriented generally in an axial direction, and configured to receive fluid flow from the cooling channel; anda plurality of ribs connected to the pressure side and suction side and extending generally in an axial direction and position radially between adjacent teardrop-shaped pedestals. 30. The turbine airfoil of claim 29, wherein the trailing edge cooling system further comprises a plurality of rows of chevron shaped trip strips positioned on an inner wall of the pressure side and the suction side, radially between adjacent ribs and oriented with an apex of each chevron pointed upstream.