What is runner in Francis turbine?
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What is runner in Francis turbine?
Francis turbine embraces a radial flow runner in which the water strikes the runner blades radially and departs axially along its axis through a draft tube. The Francis turbine is a mixed flow-type turbine in which the water passes through the curved guide vanes and creates a high curved rotational flow at the outlet.
How many blades does the Francis turbine runner have?
Clarification: In a Francis turbine runner, the number of blades are generally between 16 to 24.
What is the order of blood in Francis turbine runner?
The runner blade of Francis turbine is order 16 to 24.
What is the application of Francis turbine?
Francis turbine is used for the production of electricity most frequently in medium or large-scale hydropower stations. These turbines can be used for heads as low as 2 meters and as high as 300 meters.
What are the advantages of Francis turbine?
Francis turbines have high hydraulic efficiency, more than 90%. In addition, this type of hydraulic turbine can be designed with a varied range of heads and flows. They have a wide range of activities compared to the height of the fluid flowing through the turbine.
Which turbine has the least number of blades?
Kaplan Turbine has a very small number of blades 3 to 8.
On what principle does the Francis turbine work?
Francis Turbine is a combination of both impulse and reaction turbine, where the blades rotate using both reaction and impulse force of water flowing through them producing electricity more efficiently. Francis turbine is used for the production of electricity in hydro power stations.
Why is Francis turbine used?
Francis turbines are used frequently in hydroelectric power plants. In these plants, high pressure water enters the turbine through the snail-shell casing (the volute). This lowers the pressure as the water curls through the tube, but the speed of the water is maintained.
Why do we use Francis turbine?
Its primary function is to reduce the velocity of discharged water to minimize the loss of kinetic energy at the outlet. This permits the turbine to be set above the tail water without appreciable drop of available head.
What is the working principle of Francis turbine?
In a Francis turbine, runner blades are divided into 2 parts. The lower half is made in the shape of small bucket so that it uses the impulse action of water to rotate the turbine. The upper part of the blades use the reaction force of water flowing through it. These two forces together makes the runner to rotate.
