Francis Turbine
》The Francis turbine is a type of water turbine that was developed by James B. Franceis and are used for medium head (45-400m) and medium discharge. (10-700m3/s)
》The Francis turbine is a type of reaction turbine, a category of turbine in which the working fluid comes to the turbine under immense pressure and the energy is extracted by the turbine blades from the working fluid .
》the turbine's exit tube is shaped to help deccelerate the water flow and recover the pressure.
》Water flow in radial from exterior to interior .
》The Francis turbine is a type of reaction turbine, a category of turbine in which the working fluid comes to the turbine under immense pressure and the energy is extracted by the turbine blades from the working fluid .
》the turbine's exit tube is shaped to help deccelerate the water flow and recover the pressure.
》Water flow in radial from exterior to interior .
Applications
》Francis type unit cover a head range from 40-600m (130-2000ft)
》Its efficiency decrease as flow decrease.
》They may be used for pumped storage, where a reservoir is filled by the turbine (acting as a pump) driven by the generator acting as a large electrical motor during period of low power demand .
》Its efficiency decrease as flow decrease.
》They may be used for pumped storage, where a reservoir is filled by the turbine (acting as a pump) driven by the generator acting as a large electrical motor during period of low power demand .
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