Which type of blade is used in Francis turbine?
Runner Blades
Runner Blades 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.
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.
What is the order of blades in Francis turbine runner?
The Working Mechanism of a Francis Turbine The turbine consists of an outer spiral casing, followed by a set of fixed blades called stay vanes. Next comes a collection of moving blades called guide vanes, then a bunch of centrally placed blades called runner and lastly, an outgoing duct called a duct draft tube.
How many blades does the Francis turbine runner have?
It has three units of splitter blade Francis runners of 4.2 MW each.
What are the major technical specifications of a Francis turbine?
Penstock diameters are between 1 and 10 m (3.3 and 32.8 ft). The speeds of different turbine units range from 70 to 1000 rpm. A wicket gate around the outside of the turbine’s rotating runner controls the rate of water flow through the turbine for different power production rates.
How many blades are in the Francis turbine runner Mcq?
Clarification: In a Francis turbine runner, the number of blades are generally between 16 to 24.
How many blades does a Kaplan turbine runner have?
Kaplan Turbine has a very small number of blades 3 to 8.
Is Francis turbine axial flow?
The Francis turbine is a type of water turbine. It is an inward-flow reaction turbine that combines radial and axial flow concepts. Francis turbines are the most common water turbine in use today, and can achieve over 95% efficiency.