| 摘要 |
PURPOSE: A multi-stage turbine and a method for purging front and rear wheel spaces are provided to improve the efficiency of a gas turbine. CONSTITUTION: In a multi-stage turbine, at least one turbine wheel(12) supports a row of buckets(14) for rotation, and the turbine wheel is located axially between first and second annular fixed arrays of nozzles(36, 38). A cooling air circuit for purging a wheel space between the turbine wheel and the second fixed annular array of nozzles(38) comprises a flow path through a shank portion(50) of one or more buckets connecting a wheel space between the turbine wheel and the first fixed annular array of nozzles(36) with the wheel space between the turbine wheel and the second fixed annular array of nozzles. The shank portion of the one or more buckets includes a forward wall and a rear wall forming, in part, a hollow chamber in the shank portion. The flow path is formed by at least one hole in the forward wall, the hollow chamber, and at least one hole in the rear wall.
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