Steam turbine

A steam turbine is a bladed rotor that extracts thermal energy from pressurized steam and uses it to do mechanical work.

Since the steam often needs to be produced from a fuel (ie biofuel, nuclear material), a additional energy conversion (fuel-thermal energy) needs to be done before the thermal energy can be used to produce steam from water. This extra conversion brings a significant energy loss.

Several types of steam turbines exist including:

• the Tesla turbine (a very robust bladed rotor which uses metal discs rather than actual blades)
• the Parsons turbine

• Fuel-powered turbine

• http://en.wikipedia.org/wiki/Steam_turbine