difference between impulse and reaction turbine

Difference Between Impulse and Reaction Turbine-PDF

Amrit Kumar Fluid Mechanics Hydraulic Machines Leave a Comment

Are you looking for the Difference Between Impulse and Reaction Turbine? So today we will study the Differences and PDF. Here you will get the articles of Mechanical Engineering in brief with some key points and you will get to know an enormous amount of knowledge from It. So If you find this articles helpful, please let us know in the comment box, either if any correction required too, also let us know in the comment box.

Let’s have an overview of Impulse and Reaction Turbine first. So,

Impulse Turbine:

Let’s know the Impulse turbine in details:

Impulse turbine changes the velocity of the water jet.

The jet impinges on the turbine curved blade which changes the direction of the flow. The resulting change in momentum (impulse) causes a force on the turbine blades.

Since the turbine is spinning, the force act through a distance (work) and the diverted water flow is left with diminished energy.

Prior to hitting the turbine blades, the water pressure (potential energy) is converted to kinetic energy by a nozzle and focused on the turbine.

No pressure changes occur at the turbine blades, and the turbine doesn’t require housing for operation.

Newton’s second law describes the transfer of energy for impulse turbine.

Impulse turbines are most often used in a very high head application.

This turbine works at atmospheric pressure.

The Impulse turbines are- Turgo, Jornal, Banki, Girad and Pelton Turbine.

Reaction Turbine:

Reaction turbines are acted on by water which changes pressure as it moves through the turbine and gives up its energy. They must be encased to contain the water pressure (or suction), there must be fully submerged in the water flow.

Newton’s third law describes the transfer of energy for the reaction turbine.

Most water turbines used a reaction turbine.

They are used in low and medium head application

This turbine works above the atmospheric pressure.

The Reaction turbines are- Thompson, Francis, Kaplan, Fourneyron and Propeller Turbine.

difference between impulse and reaction turbine

Difference Between Impulse and Reaction Turbine:

1All hydraulic energy is converted into kinetic energy by a nozzle.Only some amount of the available energy is converted into kinetic energy.
2Required less maintenance.Here it’s required more maintenance.
3The degree of reaction is zero.The degree of reaction is between ‘0’  to ‘1’
4It needs low discharge of water.It needs medium and high discharge of water.
5Water flow is a tangential direction to the turbine wheel.Water flow is radial and axial direction to the turbine wheel.
6Here is having more hydraulic efficiency.It’s having relatively less efficiency.
7Impulse turbine operates at high water heads.It operates at medium and low heads.

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Other Points are:

8Example of an impulse turbine is the Pelton wheel.Example of a Reaction turbine is Francis, Kaplan turbine.
9Flow regulation is done by means of a needle valve fitted into the nozzle.Flow regulation is carried out by means of guide vane assembly.
10The turbine is always installed above the tailrace and there is no draft tube used.Reaction turbine is generally connected to the tailrace through a draft tube which is gradually expanding passage.
11The turbine doesn’t run full and air has free access to the bucket.Water completely fills at the passage between the blades and while flowing between the inlet and outlet sections does work on the blades.
12Water is admitted only in the forms of jets. There may be one or more jets striking an equal number of buckets simultaneously.Water is admitted over the entire circumference of the runner.

Difference Between Impulse and Reaction Turbine PDF:

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About the Author

Amrit Kumar

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Amrit is a Co-founder of Learn Mechanical Portal (Previously owned "Engramritkumar.com"). He completed his diploma in Mechanical Engineering from Acharya Polytechnic Bangalore and also completed his B-Tech from Delhi. Amrit is now preparing for Govt. exams. If you need help, you can ask him regarding any suggestions in the mechanical engineering field. He loves to meet new people.

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