Product Details
Francis turbine is the most frequently used turbines for hydropower plants,it can be applied to wide range of water head from the high, medium and low.
The water flowing through a Francis turbine loses pressure, but stays at more or less the same speed, so it would be considered a reaction turbine.
Vertical Francis turbine below 800kW is available for micro hydropower projects,which has steady operation,compact structure and high efficiency.If the diameter of turbine runner exceeds 84cm,then horizontal Francis Turbine units can be adapted.If the diameter is smaller than 84cm,then vertical Francis Turbine units are available.
The installation areas of which vertical Francis turbine required is smaller than installation areas and are easy to install,while they need more hydraulic construction work.
The Francis turbines manufactured by Boland can be used in water head from 15m to 250m, the diameter of the runner is from 0.35m to 4.5m, and the installed capacity of a single unit is from 50KW to 50MW roughly.
Francis turbines have a simple design. A flat, circular plate is attached to a rotating shaft which lies on this plate vertically. The plate itself has curved blades on it, and this combined unit of blades, plate, and rotating shaft are known collectively as the runner.Surrounding the runner is a channel known as a volute. The volute is simply a curved tube that diminishes in size as it approaches the runner, slightly resembling a snail shell. Blades known as guide vanes do not move, and are set into the inner surface of the volute. These vanes serve the purpose of directing the water through the volute to the runner at an appropriate angle.
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