Francis Turbine Ppt
Water with high head pressure enters the turbine through the spiral casing surrounding the guide vanes. There is a draft tube attached to the central exit of the runner. It is a spiral casing, with uniformly decreasing cross- section area, along the circumference.
This mechanical energy is used in running an electric generator which is directly coupled to the shaft of the turbine. It consists of a circular disc on the periphery of which a number of buckets evenly spaced are fixed. It also maintains the functions imparted by the draft tubes in water turbines.
Francis Turbine has a circular plate fixed to the rotating shaft perpendicular to its surface and passing through its center. Thus making turbine more efficient. It is the most widely used turbine in the hydro-power plants. Why did these three websites have pictures of the Beaufort scale? The major components besides the runner are a scroll case, wicket gates, and a draft tube.
As the water flows through the runner its pressure and angular momentum reduces. This reduction imparts reaction on the runner and power is transferred to the turbine shaft.
Francis Turbine Working Principle Main Parts Diagram and Application
The vanes are fixed to the hub and they are not adjustable, the runner is known as propeller turbine. On the hub, the adjustable vanes are fixed as shown in fig. These part of the set, glides over the inner surfaces and comes out at the outer edge. The splitter divides the jet into two equal parts and the comes out at the outer edge of the bucket.
This is only the impulse type of tangential flow hydraulic turbine. Pumps are defined as the hydraulic machines which convert Mechanical energy into hydraulic energy are called pumps. It also acts as safeguard against accidents. The driving force on the runner is both due to impulse and reaction effect. Francis Turbines are generally installed with their axis vertical.
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Francis, an American civil engineer comes up with his turbine called Francis turbine. The Francis reaction turbine is still in wide use today. Pelt on wheel with single jet Pelton wheel with two or more jet Francis turbine Kaplan or propeller turbine. Documents Similar To Turbines Ppt. Tangential flow turbine In tangential flow turbine, of burger island 2 water flows along the tangent to the path of the runner.
On the other hand, if the spear is pushed back, the amount of water striking the runner increases. If not, please let us know here what you were looking for and we'll try to help you out.
Construction, Working, diagram. Then water passes through guide vanes where it is directed to strike the blades on the runner at optimum angles.
Guide vanes are housed in a spiral casing called as volute. If the water parallel to the axis of the rotation of the shaft, the turbine is known as axial flow turbine. Impulse turbines- The impulse generated by changing the direction of flow of high velocity fluid or gas jet is used to spin the turbine.
Kaplan Turbine Kaplan turbine, which consists of a hub fixed to the shaft. The inlet velocity triangle is drawn at the splitter and outlet velocity triangle is drawn at the outer edge of the bucket. We deal in compound crew jack, jib crane, bending of beam apparatus, chain pulley block and many more.
The Justification For Radical Changes. The casing of the pelton wheel does not perform any hydraulic function. The angle of guide vanes decides the angle of attack of water at the runner blades thus make sure the output of the turbine. You just clipped your first slide!
Draft tube connects the runner exit to the tail race. Visibility Others can see my Clipboard. Are you sure you want to Yes No.
Specific speed plays an important role for selecting the type of the turbine. Jonjon Olali at Bayelsa State Government very educative. Classification of Hydraulic Turbines K.
Francis Turbine PowerPoint PPT Presentations
Difference Between Impulse and Reaction Turbine. Evolution to modern hydropower turbine began with Bernard Forest de Belidor in the mid s. The outward radial flow reaction turbine in which the water from casing enters the stationary guide wheel. Thus there would be a decrease in both kinetic energy and potential energy of water at exit, then what it has when it enters the turbine.
Universit - Le pi conosciute sono la Francis e la Kaplan. Fundamental similarity considerations Similarity Considerations Reduced parameters Dimensionless terms Classification of turbines Performance characteristics. Also the performance of a turbine can be predicted by knowing the specific speed of the turbine. Runner with Buckets Fig shows the runner of a pelton wheel. Energy is transferred to or from a continuously flowing fluid by the dynamic action of moving blades or rotors.
Stay vanes and guide vanes guides the water to the runner blades. For the axial flow reaction turbine the shaft of the turbine is vertical. As the water flows through the runner, a part of pressure energy goes on changing into kinetic energy. The fluid or gases in the turbine blades have no pressure change and the entire pressure drop takes place in the stationery blades.
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