ABSTRACT
Turbomachines, collectively called turbomachinery, constitute a large class of machines and, as energy conversion devices, are an integral part of our civilized world. They include such devices as pumps, turbines, fans, and compressors. Each turbomachine involves mechanical energy transfer, in the form of shaft work, between a continuously flowing fluid and a bladed rotor. If the energy transfer is from the rotor to the fluid, the device is called a pump (liquid flow), fan (low pressure rise), or compressor (high pressure rise); if it is from the fluid to the rotor, the machine is called a turbine (gas, steam, or hydraulic). The fluid flow in a turbomachine could be incompressible (liquid or gas flow at Mach numbers less than 0.3) or compressible (gas flow at high subsonic and transonic Mach numbers).
