How does a Francis turbine work?
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 are the 5 main components of Francis turbine?
A Francis Turbine consists of the 5 main parts those are:
- Spiral Casing.
- Stay Vanes.
- Guide Vanes.
- Runner Blades.
- Draft Tube.
What is Francis reaction turbine?
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.
What is turbine explain working of Francis turbine with diagram?
Francis Turbine Working Principle With Diagram. Francis turbines are employed regularly in hydroelectric power plants. In these power plants, high-pressure water enters the turbine through the snail-shell casing (the volute). The water is also deflected in the axial direction to exit a draft tube to the tail race.
Where is Francis turbine used?
hydroelectric power plants
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.
What is Francis turbine in PDF?
Abstract. Francis turbine is an inward flow reaction turbine and used for medium heads. The turbine consists of: (1) Scroll casing which is case that contain the guide vanes and the runner. The purpose of the scroll casing is to prevent the eddies and to distribute the water uniformly over the guide vanes.
Where are 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 draft tube is used in Francis turbine?
The draft tube is an important component of a Francis turbine which influences the hydraulic performance. It is located just under the runner and allowed to decelerate the flow velocity exiting the runner, thereby converting the excess of kinetic energy into static pressure.
Why Francis turbine is most commonly used?
Francis turbines are most widely used all over the world. These turbines use at the hydroelectric powerplant for generating electricity. The head of these turbines is easy to control as compared to the Pelton wheel turbines. So, these turbines are best suitable for the radial flow of water.
What is velocity diagram of Francis turbine?
The Velocity Diagram of Francis Turbine is shown below. This velocity diagram clearly shows that in ideal cases, the whirl component of outlet velocity is zero i.e at the outlet the flow is entirely axial. The applications of Francis Turbine are as follows.
What is Francis turbine?
The Francis turbine is a mixed flow reaction turbine. This turbine is used for medium heads with medium discharge. Water enters the runner and flows towards the center of the wheel in the radial direction and leaves parallel to the axis of the turbine.
What is the vw2 at the exit of a Francis turbine?
Φ = Vane angle at the exit. The velocity triangle at inlet and outlet of the Francis turbine is drawn in the same way as in case of inward flow creation turbine . as in case of Francis turbine, the discharge is radial at the outlet, the velocity of whirl at the outlet ( i.e. Vw2 ) will be zero.
How can the production of electricity be estimated from Francis turbine?
Electricity production can be estimated with the help of flow rate and head. Francis turbine may be designed for a wide range of head and flow. It has high efficiency. They may be used as Pump. Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college.
