| 摘要 |
A turbine bucket includes a bucket airfoil having a cross-section in an airfoil shape. The bucket is twisted from a root end to a tip end. The degree of twist defines an accumulated angular offset of the tip end in a range of 10-15 degrees, preferably 13 degrees, relative to a tangential direction of the rotor. The leading edge of the blade may be radiused to reduce positive incidence performance sensitivity. Preferably the bucket has a higher twist between 30-60% of the blade height than in other sections, alternatively the root of the blade may be more highly twisted. The turbine bucket may be used in the last stage of a steam turbine.
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