Which casing is used in Pelton turbine?

It prevents the splashing of the water and helps to discharge the water to the trail race. It also acts as a safeguard in the case of an accident occurs. Cast iron or fabricated steel plates are used to make the casing of the Pelton Turbine.

Why spiral casing is used in turbine?

Spiral casing is an important component of Francis turbine for even distribution of kinetic and potential energy of water so as to achieve the required reaction for better performance of the runner.

Why casing of a Pelton turbine has no hydraulic function to perform?

The casing of Pelton Wheel does not perform any Hydraulic function. Breaking Jet: When the nozzle is closed completely by moving the spear in forward direction, the amount of water striking the bucket reduces to zero. But due inertia, the runner goes on revolving for some more time.

What is the shape of Pelton turbine?

The Pelton turbine has a fairly simplistic design. A large circular disk is mounted on some sort of rotating shaft known as a rotor. Mounted on this circular disk are cup shaped blades known as buckets evenly spaced around the entire wheel. Generally, the buckets are arranged in pairs around the rim.

What is nozzle in pelton turbine?

A nozzle is a gradually converging short tube which is fitted at the outlet and of the penstock for the purpose of converting the total energy of the flowing water into kinetic energy. Nozzles are used where high velocities of flow are required to be developed.

Which is not a part of a pelton turbine?

Draft Tube is not a part of the Pelton wheel turbine, it is the main component of an axial flow reaction turbine.

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 a spiral casing?

spiral casing in American English noun. a spiral passage for directing the water from a penstock around a water turbine and into the rotor.

What is nozzle in Pelton turbine?

Why do we have splitter on the buckets of Pelton turbine?

Answer: In Pelton Turbine, the role of splitters is to divide the water falling mid way of it. This causes the pelton turbine to rotate with more velocity.

Is Pelton wheel axial or radial?

Example: Pelton wheel turbine. Radial flow turbines: In this type of turbines, the water strikes in the radial direction. accordingly, it is further classified as: Inward flow turbine: The flow is inward from periphery to the centre (centripetal type); Example: old Francis turbine.

Can we use draft tube in Pelton turbine?

Unlike reaction water turbines, Pelton turbines require no draft tube because they operate in a pressure-less environment.

What is the use of spiral casing in Pelton wheel turbine?

There is no use of a spiral casing in a Pelton Wheel Turbine. A Pelton Turbine is an Impulse turbine, which rotates because of impulse force from the water jet coming out of the nozzle connected at the end of Penstock. Spiral Casings are used to direct the flow of water in reaction turbines.

What is the efficiency of Pelton turbine?

It is defined as a ratio of the power available at the shaft to the net power available at the base of the nozzle. The Pelton turbine is the most efficient of hydro turbines. Each bucket splits the water jet in half, thus balancing the side-load forces or thrust on the wheel and thus the bearings. It operates on the high head and low discharge.

What is the application of a pelton wheel?

Application of Pelton Wheel: Pelton wheel is the preferred turbine for hydropower when the available water source has a relatively high hydraulic head at low flow rates. In a hydroelectric power plant, This is used to drive the generator of the turbine and that generator generates the mechanical energy of the turbine into electrical energy.

What is a breaking jet in a Pelton turbine?

This jet of water used to stop the runner of the turbine is called breaking jet. The water stored at a high head is made to flow through the penstock and reaches the nozzle of the Pelton turbine. The nozzle increases the K.E. of the water and directs the water in the form of a jet.