Turbomachinery, in mechanical engineering, describes machines that transfer energy between a rotor and a fluid, including both turbines and compressors. While a turbine transfers energy from a fluid to a rotor, a compressor transfers energy from a rotor to a fluid. A turbomachine is a device where mechanical energy in the form. A turbomachine is a device where mechanical energy in the form. of shaft work, is transferred either to or from a continuously flowing fluid by the dynamic action of rotating blade rows.