A cooling channel (36, 36B) cools an exterior surface (40 or 42) or two opposed exterior surfaces (40 and 42). The channel has a near-wall inner surface (48, 50) with a width (W1). Interior side surfaces (52, 54) may converge to a reduced channel width (W2). The near-wall inner surface (48, 50) may
A cooling channel (36, 36B) cools an exterior surface (40 or 42) or two opposed exterior surfaces (40 and 42). The channel has a near-wall inner surface (48, 50) with a width (W1). Interior side surfaces (52, 54) may converge to a reduced channel width (W2). The near-wall inner surface (48, 50) may have fins (44) aligned with a coolant flow (22). The fins may highest at mid-width of the near-wall inner surface. A two-sided cooling channel (36) may have two near-wall inner surfaces (48, 50) parallel to two respective exterior surfaces (40, 42), and may have an hourglass shaped transverse sectional profile. The tapered channel width (W1, W2) and the fin height profile (56A, 56B) increases cooling flow (22) into the corners (C) of the channel for more uniform and efficient cooling.
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1. A cooling channel in a component, the cooling channel comprising: a first near-wall inner surface aligned substantially parallel to a first exterior surface of the component; a first plurality of substantially parallel fins, located on the first near-wall inner surface, that are substantially lon
1. A cooling channel in a component, the cooling channel comprising: a first near-wall inner surface aligned substantially parallel to a first exterior surface of the component; a first plurality of substantially parallel fins, located on the first near-wall inner surface, that are substantially longitudinally aligned with a flow direction of the cooling channel; wherein: the first plurality of substantially parallel fins comprises a height profile that is convex across a width of the first near-wall inner surface as viewed in a transverse section plane of the cooling channel, wherein the transverse section plane is normal to the flow direction; and a maximum height of the height profile varies along a length of the cooling channel. 2. The cooling channel of claim 1, further comprising: two interior side surfaces that taper toward each other from opposite sides of the first near-wall inner surface to define a reducing channel width in a direction moving away from the first near-wall inner surface. 3. The cooling channel of claim 1, further comprising: two interior side surfaces that taper toward each other from opposite sides of the first near-wall inner surface to define a reduced channel width away from the first near-wall inner surface that is 80% or less of the width of the first near-wall inner surface. 4. The cooling channel of claim 1, further comprising: a second near-wall inner surface aligned parallel to a second exterior surface of the component; and a second plurality of substantially parallel fins, located on the second near-wall inner surface, that are substantially aligned with the flow direction of the cooling channel; wherein: the second plurality of parallel fins comprises a height profile that is convex across a width of the second near-wall inner surface as viewed in the transverse section plane. 5. The cooling channel of claim 1, wherein: the first and second interior side surfaces are convex, and define a substantially hourglass shaped transverse sectional profile of the cooling channel with a waist width that is less than the width of the first near-wall inner surface. 6. A series of cooling channels according to claim 1, wherein: the series of cooling channels forms coolant exit channels in a trailing edge portion of a turbine airfoil. 7. The cooling channel of claim 1, wherein: a transverse sectional profile of the cooling channel is substantially trapezoidal, and the first near-wall inner surface defines a longest side thereof. 8. A first series of cooling channels according to claim 1, each cooling channel from said first series of cooling channels aligned substantially parallel to the first exterior surface of the component, and a second series of cooling channels, each cooling channel from said second series of cooling channels aligned substantially parallel to a second exterior surface of the component, the first and second exterior surfaces of the component defining a trailing edge portion of a turbine airfoil. 9. A turbine airfoil comprising the cooling channel of claim 1. 10. A coolant exit channel in a trailing edge portion of a turbine airfoil, comprising: a first near-wall inner surface aligned substantially parallel to a first exterior surface of the trailing edge portion; and a plurality of fins on the first near-wall inner surface that are substantially aligned with the flow direction of the coolant exit channel, the plurality of fins following a convex height profile across the width of the first near-wall inner surface as viewed in the transverse section plane of the cooling channel; wherein: a maximum height of the convex height profile varies along a length of the cooling channel. 11. The coolant exit channel of claim 10, further comprising: a second near-wall inner surface aligned substantially parallel to a second exterior surface of the trailing edge portion; and a second plurality of parallel fins, located on the second near-wall inner surface, that are substantially aligned with the flow direction of the coolant exit channel, and that substantially follow a convex height profile across a width of the second near-wall inner surface as viewed in the transverse section plane of the cooling channel; wherein: the two interior side surfaces span between respective first and second sides of the first and second near-wall inner surfaces, forming a substantially tapered shaped transverse sectional profile of the coolant exit channel as viewed in the transverse section plane of the cooling channel. 12. The coolant exit channel of claim 10, wherein: a transverse sectional profile of the coolant exit channel is substantially trapezoidal, and the first near-wall inner surface defines a longest side thereof. 13. A first series of cooling channels according to claim 10, each cooling channel from said first series of cooling channels aligned substantially parallel to the first exterior surface of the trailing edge portion, and a second series of cooling channels, each cooling channel from said second series of cooling channels aligned substantially parallel to and relates to a second exterior surface of the trailing edge portion. 14. A cooling channel in a component, the cooling channel comprising: a first near-wall inner surface aligned substantially parallel to a first exterior surface of the component; a tapered transverse sectional profile that is wider at the first near-wall inner surface and narrower away from the first near-wall inner surface as viewed in a transverse section plane of the cooling channel, wherein the transverse section plane is normal to a flow direction of the coolant exit channel; and one or more cooling fins located on the first near-wall inner surface and substantially longitudinally aligned with the flow direction of the cooling channel; wherein: the cooling channel guides a coolant flow therein preferentially toward near-wall distal corners of the cooling channel as viewed in the transverse section plane of the cooling channel; and a height of each of the one or more cooling fins varies along a length of the cooling channel. 15. The cooling channel of claim 14, wherein: wherein the one or more cooling fins range in height, being tallest at a mid-width of the first near-wall inner surface as viewed in the transverse section plane of the cooling channel. 16. The cooling channel of claim 14, further comprising: a second near-wall inner surface aligned substantially parallel to a second exterior surface of the component; and a second one or more cooling fins located on the second near-wall inner surface, the second one or more cooling fins substantially longitudinally aligned with the flow direction of the cooling channel; wherein: the second one or more cooling fins range in height, being tallest at a mid-width of the second near-wall inner surface as viewed in the transverse section plane of the cooling channel; and first and second interior side surfaces are located between respective first and second sides of the first and second near-wall inner surfaces. 17. The cooling channel of claim 14, wherein: the first and second interior side surfaces are convex, and define a substantially hourglass shape in a transverse sectional profile of the cooling channel, the hourglass shape comprising a waist width that is 65% or less of a width of the first near-wall inner surface. 18. A series of cooling channels formed according to claim 14, wherein: said series of cooling channels are coolant exit channels in a trailing edge portion of a turbine airfoil. 19. A first series of cooling channels formed according to claim 14, wherein each cooling channel from said first series of cooling channels aligned substantially parallel to the first exterior surface of the component, and a second series of cooling channels formed, wherein each cooling channel from said first series of cooling channels aligned substantially parallel to and relates to a second exterior surface of the component. 20. The series of cooling channels of claim 19, wherein: said series of cooling channels form coolant exit channels in a trailing edge of a turbine airfoil.
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