| 摘要 |
A set of bladed buckets is provided for a turbine wheel having a male dovetail. The turbine wheel includes axial projections projecting outwardly from both sides of the wheel and formed on substantially the entire periphery of the wheel, except for an interruption by a notch formed by removal of portions of the male dovetail at a bucket loading location. A closure group includes a bladed closure bucket and a pair of adjacent bladed buckets, each having a root portion, a platform and an airfoil. The root portions include a pair of radially inwardly extending laterally spaced tangs, and retaining grooves having a non-circular profile. The adjacent bladed buckets are disposed on each side of the bladed closure bucket. A retaining key has a non-circular axial cross section, and is configured to fit into an opening defined by opposing retaining grooves in the bladed closure bucket and bladed buckets.
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