May 2018
Intermediate to advanced
1160 pages
30h 12m
English
Content preview from Thermal Engineering
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Chapter 7
Steam Turbines
7.1 ❐ PRINCIPLE OF OPERATION OF STEAM TURBINES
A steam turbine works on the dynamic action of steam. Steam is caused to fall in pressure in a passage or nozzle. Due to this fall in pressure, certain amount of heat energy is converted into kinetic energy to give it high velocity. The high velocity steam impinges on the moving blades of the turbine and changes the direction of motion and thus gives rise to a change in momentum, therefore, a force. Essentially, the nozzles direct the steam so that it flows in a well-formed high velocity jet. Moving buckets convert this high-velocity jet to mechanical work in a rotating shaft.
In impulse turbines, there is a drop of steam pressure and consequent development of kinetic ...
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