TURBINE BUCKET FOR CONTROL OF WHEELSPACE PURGE AIR

摘要

Embodiments of the invention relate generally to rotary machines and, more particularly, to the control of wheel space purge air in gas turbines. In one embodiment, the invention provides a turbine bucket (40) comprising: a platform portion (42); an airfoil (50) extending radially outward from the platform portion (42); a shank portion (60) extending radially inward from the platform portion (42); at least one angel wing (70) extending axially from a face (62) of the shank portion (60), the at least one angel wing (70) including an angel wing rim (74) extending radially upward toward the airfoil (50); and a plurality of voids (110) disposed along the angel wing rim.