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US 8,262,357 B2Granted
Extended length holes for tip film and tip floor cooling
AssigneeSiemens Energy, Inc.
InventorShantanu P. Mhetras
Life of this patent
Estimating the term…
Abstract
The tip cooling arrangement of the present application reduces large cooling flow requirements which can compromise turbine performance. The tip cooling arrangement of the present application provides convective cooling of a turbine blade tip end, whether a flat tip or a squealer, by extending holes that provide fluid for film cooling the tip end. The holes are thus lengthened and extend from the relatively cooler suction side of the blade to the pressure side of the blade in close proximity to the floor of the tip end.
Claims20
A turbine blade, comprising:
- a generally elongated blade having a leading edge, a trailing edge, a pressure side and a suction side;
- a tip at a first end of said elongated blade;
- a root coupled to said elongated blade at a second end generally opposite said first end for supporting said elongated blade and for coupling said elongated blade to a disc;
- a cooling system including at least one inner cavity in said elongated blade;
- and
- wherein the cooling system further comprises:
- at least one elongated slot extending radially outwardly from said inner cavity, and having a direction of elongation in a chordal direction of said elongated blade;
- a plurality of elongated cooling holes having a first end in communication with said at least one slot and with said inner cavity proximate said suction side of said elongated blade and a second end defining a cooling orifice in said pressure side of said elongated blade, each of said elongated cooling holes defining a substantially linear axis between said first and second ends of each of said elongated cooling holes;
- and
- said elongated cooling holes being positioned so that cooling fluid passing from said cavity through said elongated cooling holes cools said tip and is discharged from said orifice on said pressure side of said elongated blade to mix with and cool hot gas before it passes over said tip.
7 more elements
A turbine blade, comprising:
- a generally elongated blade having a leading edge, a trailing edge, a pressure side and a suction side;
- a tip at a first end of said elongated blade;
- a root coupled to said elongated blade at a second end generally opposite said first end for supporting said elongated blade and for coupling said elongated blade to a disc;
- and
- a cooling system comprising:
- at least one inner cavity in said elongated blade;
- at least one elongated slot extending radially outwardly from said inner cavity and having a direction of elongation in a chordal direction of said elongated blade;
- and
- a plurality of elongated cooling holes spaced apart from one another in the chordal direction of said elongated blade, each elongated cooling hole having:
- a first end in communication with said at least one slot and with said inner cavity proximate said suction side of said elongated blade;
- and
- a second end defining a cooling orifice in said pressure side of said elongated blade;
- wherein each of said elongated cooling holes defines a substantially linear axis between said respective first and second ends;
- and
- wherein said elongated cooling holes are positioned so that cooling fluid passing from said cavity through said elongated cooling holes cools said tip and is discharged from said orifice on said pressure side of said elongated blade to mix with and cool hot gas before it passes over said tip.
12 more elements
Dependencies are inferred from the claim text.