13-08-2012, 03:22 PM
Steam turbines
Steam turbines.ppt (Size: 7.17 MB / Downloads: 372)
Defination of the turbine
Turbine is an engine that converts energy of fluid into mechanical energy
The steam turbine is steam driven rotary engine.
Some historical facts
The first „turbine” was made by Hero of Alexandria in the second century
In the end of XVIII century the Industrial Revolution began (in 1770 first reciprocating piston steam engine invented by Thomas Newcomen and invented by James Watt started its work)
The first steam turbines were constructed in 1883 by Dr Gustaf de Laval and in 1884 by sir Charles Parsons
In1896 Charles Curtis received a patent on impulse turbine
In 1910 was created radial turbine (Ljungström)
How does the steam turbine work?
Impulse stage – whole pressure drop in nozzle (whole enthalpy drop is changed into kinetic energy in the nozzle)
Reaction stage – pressure drop both in stationary blades and in rotary blades (enthalpy drop changed into kinetic energy both in stationary blades and in the moving blades in rotor)
Advantages of turbines
Large power achieved by relatively small size
High efficiency
Simple design
High revolution