Steam turbine:

Steam turbine is such type of turbine where steam is used as working fluid. When steam is injected over the blades it rotates at a certain speed. Since steam is used for rotation it is called steam turbine. Generally it is used at steam turbine power station.

In most power station, steam turbines are used for steam turbine units. All the turbines are manufactured by BBC (Germany).

                                                 Figure: Steam turbine (case opened).

Main parts of steam turbine:                

Ø      Rotor

Ø      Blades (fixed and moving)

Ø      Bearings (thrust and journal)

Ø      Turbine casing

Ø      Valves (main stop valve, control valve etc).