What are the 5 main components of Francis turbine?

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 are the main components of Francis turbine?

Main Components of Francis Turbine

• Spiral Casing. Spiral casing is the inlet medium of water to the turbine.
• Stay Vanes. Stay vanes and guide vanes guides the water to the runner blades.
• Guide Vanes.
• Runner Blades.
• Draft Tube.

What is the Francis turbine used for?

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 fluid mechanics?

It is the most commonly used turbine used under medium head about 45-400 meter.It is a reaction turbine and is used for the electricity generation and is preferred more in comparison to kalpan and pelton turbines.

Which type of flow is in Francis turbine?

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.

What is Francis turbine PPT?

Francis Turbine is an Inward Flow Reaction Turbine having Radial Discharge at Outlet. (i.e. = 0). Modern Francis Turbine is a mixed flow type turbine (i.e. Water enters the runner of the turbine in the radial direction and leaves the runner in the axial direction).

Why Francis turbine can be used as a pump?

When water flows to a lower elevation, the power plant generates electricity. When water is pumped to a higher elevation, the power plant creates a store of potential energy. Pumped storage plants use Francis turbines because they can act as both a hydraulic pump and hydraulic turbine.

What is the efficiency of Francis turbine?

Finally, the optimal scheme of the new Francis turbine was proven to have a high efficiency of 88% and good operation stability through testing of a physical model and can achieve the goal of harvesting renewable energy in the cooling tower.

What is the useful life of a Francis turbine?

The current average age of the hydro power turbines in the Norwegian power system is in the order of 40 years. This leads the power plant owners to search for the optimal time to refurbish, in order to avoid retiring turbines prematurely, while ensuring no catastrophic failures linked to turbine end of life.

Which type of turbine is Francis turbine?

inward-flow reaction turbine
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.

What is the principle of turbine?

It works on the principle of Newton’s second law. It has a number of elliptical half-sized buckets fitted instead of blades on the rotor. When the water strikes the buckets at high speed, the rotor starts rotating, then the kinetic energy of water is converted into mechanical energy.

What type of turbine is Francis turbine?

-flow reaction turbine

How does water work in a Francis turbine?

During the working of the Francis turbine, water enters into the turbine volute casing and this water passes through the guide blades and stationary blades. The volute casing keeps in reducing diameter to maintain the flow pressure.

How are the runner blades in a Francis turbine made?

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.

How are stay vanes used in a Francis turbine?

Stay vanes Stay vanes and guide vanes guides the water to the runner blades. Stay vanes remain stationary at their position and reduces the swirling of water due to radial flow, as it enters the runner blades. Thus making turbine more efficient.

What’s the difference between a Pelton and Francis turbine?

The difference in the operating head can be extra simply controlled in Francis turbine than in the Pelton wheel turbine. The runner size is small. Changing the head is easily controlled.