The Archimedean Screw Turbine or Screw Generator is the same as Archimedes screw pump but in reverse. When used as an Archimedean hydro screw turbine the principle is the same but acts in reverse.  The water enters the screw at the top and the weight of the water pushes on the helical flights, allowing the water to fall to the lower level and causing the screw to rotate.  This rotational energy can then be extracted by an electrical generator connected to the main shaft of the screw turbine.

Basic Diagram of an Archimedean Screw Turbine

Archimedes screw generator set-up diagram

Archimedean Screw Turbines or Screw Generator are relative newcomers to the small-scale hydro world having only arrived on the scene in the last two decades.  However, they have been around for many decades as Archimedes screw pumps where tens-of-thousands have been installed worldwide, particularly in sewage treatment works.  The same manufacturers that dominate the screw pump market are now the main suppliers into the hydro screw  Turbines or Screw Generator in the hydro power/energy market as well.

Archimedean Screw Turbine or Screw Generator

enclosed type Archimedes screw generator