Fluid Mechanics and Machinery

Difference Between Impulse and Reaction Turbine

Difference Between Impulse and Reaction Turbine:

Today we will study the difference between impulse and reaction turbine. Before going into details I must say, 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 You Find helpful this articles please let us know in the comment box either if any correction required too, also let’s know in the comment box.

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Difference Between Impulse and Reaction Turbine:

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

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8 Example of impulse turbine is Pelton wheel. Example of reaction turbine is Francis, Kaplan turbine.
9 Flow regulation is done by means of needle valve fitted into the nozzle. Flow regulation is carried out by means of guide vane assembly.
10 The 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.
11 The turbine doesn’t run full and air has a 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.
12 Water 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.

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