page_title: Screw turbine
hierarchical_section_title: Screw turbine
caption_attribution_description: English: Helical screw with single, double, triple and quadruple start
context_page_description: The screw turbine is a water turbine which uses the principle of the Archimedean screw to convert the potential energy of water on an upstream level into work. It may be compared to the water wheel. The turbine consists of a rotor in the shape of an Archimedean screw which rotates in a semicircular trough. Water flows into the turbine and its weight presses down onto the blades of the turbine, which in turn forces the turbine to turn. Water flows freely off the end of the turbine into the river. The upper end of the screw is connected to a generator through a gearbox.
context_section_description: The screw turbine is a water turbine which uses the principle of the Archimedean screw to convert the potential energy of water on an upstream level into  work. It may be compared to the water wheel. The turbine consists of a rotor in the shape of an Archimedean screw which rotates in a semicircular trough. Water flows into the turbine and its weight presses down onto the blades of the turbine, which in turn forces the turbine to turn. Water flows freely off the end of the turbine into the river. The upper end of the screw is connected to a generator through a gearbox.
caption: Screw turbines typically have three or four flights (second row)
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