The Pelton turbine with the casing is shown in the figure given below.

– SlideShare. The double Semi ellipsoidal buckets split the water jet into two halves which helps in balancing the wheel(runner). Water flows from the nozzle with high kinetic energy along the tangent to the path of the runner and when the jet of water comes in contact with the bucket, it exerts a force on the bucket called as Impulse force.

Due to the high head, it is very difficult to control variations in the operating head. Pelton turbine (or Pelton wheel), an impulse turbine, is one of the well-known type of water turbines.

PELTON WHEEL The Pelton wheel is among the most efficient types of . In order to control the quantity of water striking the runner, the nozzle fitted at the end of penstock is provided with a spear or needle fixed to the end of a rod. This is usually accomplished in one or more nozzles. The applications of Pelton Wheel Turbine is as follows. It can work on high heads and low discharge, Its efficiency decreases quickly with time. Here in this platform, you get the subject-oriented notes, latest jobs, trends, and news at your fingertips. The runner with buckets is shown in the figure given above. The water turbines converts the energy possesed by the water to mechanical energy.

The buckets of the Pelton turbine are made up of cast iron, cast steel bronze or stainless steel. This site uses Akismet to reduce spam. The rate of water flow increases and decreases when the spear is moved in a backward direction and forward direction respectively and that can be handled by means of a hand wheel(It is operated in the axial direction).

The working of Pelton Wheel Turbine is as follows.

Spear is used to control the quantity of water striking the buckets.

In order to make the casing, Cast iron or fabricated steel plates are used. Further, it is preferred at a very high head and low discharges with low specific speeds. A casing is provided only to prevent the splashing of water and for discharging the water to the tailrace. It is a channel or pipeline which controls the flow of water or it also acts as directing medium for the fluid flow. Indian Institute of Technology (ISM), Dhanbad.

It is operated by a handwheel. To achieve maximum power and efficiency, the turbine blades are designed in such a way that water jet velocity is twice the velocity of rotating buckets.

The real Pelton runner • For a real Pelton runner there will always be loss We will therefore set the hydraulic efficiency to: ηh =0.96 The absolute velocity from the nozzle will be: 0.99 ≤c1u <0.995 C1u can be set to 1,0 when dimensioning the turbine. Our main focus is to give our readers quality notes directly from the Professors, and Well Experienced Mechanical Engineers who already completed their education. Pelton Wheel Turbine is the only impulse type of hydraulic turbine named after Lester A.Pelton, the American engineer.

The Pelton wheel extracts energy from the impulse (momentum) of moving water, as opposed to its weight like traditional overshot water wheel. Your email address will not be published. For maximum power and efficiency, the turbine is designed such that, the water Jet velocity is twice the velocity of the bucket. Required fields are marked *.

THEORY In the impulse turbines, the total head available is first converted into the kinetic energy.

Pelton Turbine by Dr. Shibayan Sarkar .

but the runner keeps moving due to the inertia. He also holds the position of Assistant Professor at Sreenidhi Institute of Science and Technology. The turbine capable of working under the high potential head of water is the Pelton Wheel Turbine which works on the head greater than 300 m. Advantages of Pelton Wheel: These are some advantages of Pelton Wheel Turbine: The Pelton turbine is the most efficient of hydro turbines. What is a Pelton Turbine? In this process, the momentum of the water is transferred to the turbine.

The nozzle is used to increase the kinetic energy of water which is used to strike the buckets attached to the runner. Wheel Spear PELTON WHEEL OR TURBINE Pelton wheel, named after an eminent engineer, is an impulse turbine wherein the flow is tangential to the runner and the available energy at the entrance is completely kinetic energy.

Turbines: Pelton wheel (1889) h f .

It is well suited for operating under high heads.