TURBINE BUCKET WITH ENDWALL CONTOUR AND AIRFOIL PROFILE

摘要

Turbine frequency tuning, fluid dynamic efficiency, and performance can be improved using an airfoil profile and/or an endwall contour including at least one of a pressure side bump, a pressure side leading edge bump, or a suction side trough. In particular, by including two endwall bumps on the pressure side and a trough on the suction side combined with a particular airfoil profile, performance can be further improved.

主权项

1. A turbomachine bucket comprising:
a base; an airfoil supported by the base, the airfoil including opposed first and second ends with the first end at the base, the airfoil further including opposed pressure and suction sidewalls extending in chord between opposed leading and trailing edges and extending in span between the first and second ends of the airfoil; an endwall on the base and connected to the first end of the airfoil, the endwall including opposed endwall leading and trailing edges extending substantially circumferentially between opposed pressure and suction splitlines, a distance between the pressure and suction splitlines being substantially equal to a pitch; opposed leading edge and trailing edge regions of the endwall each extending from the respective endwall leading and trailing edges to about half way therebetween; pressure side and suction side regions of the endwall extending from the respective pressure and suction sidewalls of the airfoil; at least one pressure side feature in the endwall in the pressure side region, each respective pressure side feature including at least one of a trough or a bump relative to a nominal surface of the endwall; at least one suction side feature in the endwall in the suction side region, each respective suction side feature including at least one of a trough or a bump relative to the nominal surface of the endwall; and at least one leading edge feature in the endwall including at least one of a trough or a bump relative to the nominal surface in the leading edge region.