Close-up, low angle view of a large two-flow steam turbine rotor shut off for a repair at power generating plant. Steam turbines extract thermal energy from pressurized steam and uses it to do mechanical work on a rotating output shaft. Its modern manifestation was invented by Sir Charles Parsons in 1884. The steam enters in the middle of the shaft, and exits at each end, balancing the axial force. This design of rotor is also called two-flow, double-axial-flow, or double-exhaust.
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Power generator steam turbine during repair at power plant