ABSTRACT
Rotors, known more commonly as impellers, of centrifugal pumps, blowers, and fans are designed to transfer energy to a moving fluid that is considered incompressible. Fans and blowers usually consist of a single impeller spinning within an enclosure, known as the casing. Pumps, on the other hand, may be designed to have several impellers mounted on the same shaft, and the fluid discharging from one is conducted to the inlet of the neighboring rotor, thus making the overall pressure rise of the pump the sum ofthe individual-stage pressure rises. The individual impellers are designed to look, in cross section, somewhat like that shown in Figure 1.1.
