Turbomachines all those devices in which energy is transferred either to, or from, a continuously flowing fluid by the dynamic action of one or more moving blade rows. The word turbo or
turbine is is of Latin origin and implies that which spins or whirls around. Essentially, a rotating blade
row, a rotor or an impeller changes the stagnation enthalpy of the fluid moving through it by doing
either positive or negative work, depending upon the effect required of the machine. These enthalpy
changes are intimately linked with the pressure changes occurring simultaneously in the fluid.