Turbo machinery, in mechanical engineering, describes machines that transfer energy between a rotor and a fluid, including both turbines and compressors,etc,   The turbomachines are devices in which energy is transferred continuously flowing fluid by the dynamic action of one or more moving blade rows.

 The turbomachine is used in several applications, the primary ones being electrical power generation, aircraft propulsion and vehicular propulsion for civilian and military use. The units used in power generation are steam, gas and hydraulic turbines, ranging in capacity from a few kilowatts to several hundred and even thousands of megawatts, depending on the application. The turbomachines drives the alternator at the appropriate speed to produce power of the right frequency. In aircraft and heavy vehicular propulsion for military use, the primary driving element has been the gas turbine.