* Hydraulic Turbines - The working fluid is WATER. - Flow is incompressible.
* Gas and Steam Turbines - Density of the
working fluid may change significantly.
• Impulse Turbines - Driven by one or more
high-speed free jets.
- Each jet is accelerated
in an external nozzle.
- Fluid acceleration and
pressure drop is external
to the blades.
• Reaction Turbines - Part of the pressure
change takes place externally and part takes place
within the moving blades.