Steam Turbine is a device which is used to convert kinetic energy of steam into mechanical energy. In this, enthalpy of steam is first converted into kinetic energy in nozzle or blade passages. The high velocity steam impinges on the curved blades and its direction of flow is changed. This causes a Change of momentum and thus force developed drives the turbine shaft.
The steam turbine has been used as a prime mover in all steam power plants. Now-a-days, a single steam turbine of 1000MW capacity in built in many countries. In larger Sizes , it is used for driving electric generators. In small sizes, it is used to drive pumps , fans , compressors etc.
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