TURBINE BUCKET ANGEL WING FEATURES FOR FORWARD CAVITY FLOW CONTROL AND RELATED METHOD
First Claim
1. A turbine bucket comprising a radially inner mounting portion, a shank radially outward of the mounting portion, a radially outer airfoil and a substantially planar platform radially between the shank and the airfoil;
- at least one axially-extending angel wing seal flange on a leading end of the shank forming a circumferentially extending trench cavity along the leading end of the shank, radially between an underside of a platform leading edge and the angel wing seal flange; and
a plurality of substantially radially-extending purge air holes formed in said angel wing seal flange, adapted to fluidly connect a turbine rotor wheel space cavity with said trench cavity and thereby supply purge air to the outer surface of said angel wing seal flange.
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Accused Products
Abstract
A turbine bucket includes a radially inner mounting portion, a shank radially outward of the mounting portion, a radially outer airfoil and a substantially planar platform radially between the shank, and the airfoil. At least one axially-extending angel wing seal flange is formed on a leading end of the shank forming a circumferentially extending trench cavity along the leading edge of the shank, radially between an underside of the platform leading edge and the angel wing seal flange. A plurality of substantially radially-extending purge air holes are formed in the angel wing seal flange, adapted to fluidly connect a turbine rotor wheel space cavity with the trench cavity and thereby supply purge air to the outer surface of the angel wing seal flange.
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Citations
20 Claims
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1. A turbine bucket comprising a radially inner mounting portion, a shank radially outward of the mounting portion, a radially outer airfoil and a substantially planar platform radially between the shank and the airfoil;
- at least one axially-extending angel wing seal flange on a leading end of the shank forming a circumferentially extending trench cavity along the leading end of the shank, radially between an underside of a platform leading edge and the angel wing seal flange; and
a plurality of substantially radially-extending purge air holes formed in said angel wing seal flange, adapted to fluidly connect a turbine rotor wheel space cavity with said trench cavity and thereby supply purge air to the outer surface of said angel wing seal flange. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- at least one axially-extending angel wing seal flange on a leading end of the shank forming a circumferentially extending trench cavity along the leading end of the shank, radially between an underside of a platform leading edge and the angel wing seal flange; and
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12. A turbine wheel supporting a circumferentially arranged row of buckets, each bucket comprising a radially inner mounting portion, a shank radially outward of the mounting portion, at least one radially outer airfoil and a substantially planar platform radially between the shank and the airfoil;
- at least one axially-extending angel wing seal flange on a leading end of the shank forming a circumferentially extending trench cavity along the leading end of the shank, radially between an underside of a platform leading edge and the angel wing seal flange;
and wherein a plurality of substantially radially-extending purge air holes are formed in said angel wing seal flange, adapted to connect a turbine rotor wheel space cavity with said trench cavity. - View Dependent Claims (13, 14, 15, 16, 17, 18)
- at least one axially-extending angel wing seal flange on a leading end of the shank forming a circumferentially extending trench cavity along the leading end of the shank, radially between an underside of a platform leading edge and the angel wing seal flange;
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19. A method of controlling secondary flow at a radial gap between a rotating turbine disk mounting a plurality of buckets and an adjacent nozzle, the method comprising:
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(a) locating at least one angel wing seal on a leading end of each of said plurality of buckets extending axially toward said nozzle to thereby form a barrier between a hot stream of combustion gases on a radially outer side of said angel wing seal and purge air in a wheel space radially inward of said at least one angel wing seal; and (b) providing plural openings in said angel wing seal enabling purge air to flow into an area radially outward of said angel wing seal flange to thereby prevent the combustion gases from impinging on said angel wing seal flange. - View Dependent Claims (20)
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Specification