Gas turbine compressor last stage rotor blades with axial retention

摘要

A rotor blade and blade retention key assembly includes: a radially outer airfoil, a shank and a radially inner attachment dovetail. The attachment dovetail has a radially innermost surface (36) formed with a notch (40) at one axial end thereof, and a retention key is received in the notch (40), and rotatable from a retracted position where a retention key portion is substantially flush with the radially innermost surface (36), to an extended position where the retention key portion projects inwardly from said radially innermost surface (36) and into a recess (42,44) or pocket formed in a rotor wheel slot to prevent axial movement of the blade within the slot.