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Turbines are alternating rotor/stator blades.
A rotor is made of airfoil blades and uses lift to create angular momentum.
A stator is also made of airfoil blades but doesn't move.
Instead, it changes the flow of the fluid, increasing velocity
and changing the angle of motion.
In a steam turbine, hot air passes through a turbine.
The rotor consumes temperature, pressure, and velocity of the hot air
to transfer motion to the fan blade. Since high velocity air is needed,
a stator re-accelerates the air (consuming more temperature and pressure)
and subsequent rotor/stator pairs become larger to accommodate the lower
pressure, and the increased space that the fluid will then occupy.
As the blades become longer, they will twist as they extend outwards, to
maintain an optimum angle towards the fluid flow.