Any machine that extracts and imparts energy to a continuously moving stream of fluid can be called a turbomachine. The Examples of turbomachines are ship propeller, windmills, waterwheels, hydraulic and gas turbines, pump and compressor. In general, there are two kinds of turbomachines.
These are open and closed turbomachines.
Some open turbomachines are propellers, windmills, unshrouded fans which generally act on an infinite extent of fluid.
 Closed machines operate on a limited amount of fluid as it has to pass through a housing or casing or any closed environment.
Types of turbomachines:
Power producing and power absorbing machines 
Axial and radial flow turbomachines 
Single stage and multistage turbomachines
Thermal and hydro turbomachines

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