Page 242 - Steam Turbines--Design, Applications, and Rerating by Heinz-Bloch, Murari-Singh

(a)

(b)

(c)
Figure 12.2 Construction of axial steam turbines: (a) disk
type rotor; (b) drum type rotor with tip-sealed blades; (c) 221
drum type rotor with shrouded blades. (Asea Brown-Boveri,
Baden, Switzerland)