ABSTRACT
This chapter and the succeeding three chapters treat the rotating modules of both aero engines and gas turbines. These four chapters discuss the compressors, fans, and turbines. Since all of these are identified as turbomachines, it is necessary to introduce a definition for turbomachines here. The word (turbo) or (turbines) is of Latin origin, meaning “that which spins or whirls around.” Turbomachines are often referred to as rotor dynamic devices that transfer energy to or from a working fluid through the forces generated by a rotor. For compressors or fans, energy is transferred from the rotor to the fluid. The reverse occurs in turbines that deliver shaft power in exchange of thermal energy taken from the working fluid.
