Which turbine is used for high head?

Which turbine is used for high head?

Pelton Turbine Pelton turbines are generally used for very high heads and low flows.

Why is Pelton turbine used for low discharge?

Pelton turbine is used for high head for converting hydraulic energy into mechanical energy. In this turbine, the discharge required is comparatively low. Penstock conveys water from head race to distributor fitted with nozzle. The nozzle converts all the available energy of water into kinetic energy of jet [1].

Why do we use Pelton wheels?

A Pelton wheel is used to generate power and this wheel would utilize the flowing water impulse to create the turbine movement. These wheels are mostly used to generate electricity in the hydroelectric power plant.

What is the typical range of Heads for Pelton wheel turbine?

Pelton turbines are used on medium to high head hydropower sites with heads from 20 metres up to hundreds of metres. Power outputs can range from a few kW up to tens of MW’s on the largest utility-scale Pelton systems.

What kind of turbine is a Pelton wheel turbine?

impulse turbine
A Pelton turbine or Pelton wheel is a type of hydro turbine (specifically an impulse turbine) used frequently in hydroelectric plants.

What is high head?

High Head. Head differences of 100 meters or higher are considered high head. In this type of plant, water travelling through the turbine comes from a significantly higher elevation, meaning that the system needs a smaller volume of water to produce an equivalent amount of energy.

Is Pelton wheel a low head turbine?

Pelton Wheel Turbine is high head low discharge turbine.

Why is a Pelton wheel suitable for high heads only when are multi jet Pelton wheel used?

Pelton turbines are not used at lower heads because their rotational speeds becomes very slow and the runner required is very large and unwieldy. Having two or more jets enables a smaller runner to be used for a given flow and increases the rotational speed.

What is the maximum efficiency of Pelton wheel?

The efficiency of any mechanical device is defined as the ratio of power output to energy input. The overall efficiency of a turbine is the measure of the performance of the turbine. The overall efficiency of Pelton wheel is approximately 0.85.

What is the most efficient water turbine?

Pelton wheel, which is an impulse type turbine invented by an American engineer L. Pelton in the 19th century and has proven to be among the most efficient hydroturbines. This design is the most efficient for very high heads and stable water flows, allowing for several hundreds of megawatts of unit capacity.

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 are the advantages and disadvantages of Pelton wheel turbine?

The overall efficiency of the Pelton turbine is high. Pelton wheel turbines, both first law and the second law of motion are applied. The main advantages are that In this turbine, the whole process of water jet striking and leaving for the runner takes place at atmospheric pressure.

What is a hpelton wheel turbine?

PELTON WHEEL TURBINE is basically a Impulsive Turbine meaning that the whole of Hydraulic Energy is converted to Kinetic Energy, with the help of nozzle. Q= Discharge. H= Total Head Acting On It.

Why are nozzles used in a Pelton turbine?

Nozzles are used, which increases the velocity of water &, therefore, the kinetic energy. The Pelton wheel is a tangent flow turbine which means that the water jet will touch the turbine blade tangentially. This is a high-head turbine.