Draft Tube-Definition, Types in Details, Function, PDF

Amrit Kumar Fluid Mechanics and Machinery Leave a Comment

Are you looking for the Draft Tube? So today we will study the Definition, Types in Details, Function, Advantages, Disadvantages, Application, and PDF is available you can download it. 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.

Draft Tube Definition:

Draft Tube is an important component of a reaction turbine. The component is like a pipe in which area increasing gradually that connects the outlet of the runner to the tail-race.

There are two ends in which one end is connected to the runner outlet and the other end is submerged below the level of water in the tail-race.

It converts excess of kinetic energy into the static pressure. For making this component we used material which is cast steel and cemented concrete.

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Draft Tube Types:

The Draft Tube mainly has 4 Types which is:

  1. Simple Elbow draft tube:
  2. Elbow with varying cross-section ara Types:
  3. Moody Spreading Tube:
  4. Conical Diffuser or Straight Divergent:

Draft Tube

1. Simple Elbow draft tube:

This type is used for the low head.

The Efficiency of this tube is about to 60 percent which is moderate.

The area of inlet and outlet are the same. A little bit the outlet section is changed.

2. Elbow with varying cross-section ara Types:

It is used in the Kaplan Turbine which I have covered in details.

In this tube the upper section is circular and the outlet is a rectangular section.

3. Moody Spreading Tube:

This reducing the whirling speed of the water.

The efficiency around 88 percent which is good.

It has two passage one inlet and 2 outlets

it’s having central solid core where it distributes two parts of an outlet.

4. Conical Diffuser or Straight Divergent:

The cone angle less than 10 degrees if the angle is high cavitation will come. The cone angle is in diagram 4 when you draw a vertical line the angle made will be cone angle.

Having efficiency is about 90 percent.

This is mostly used.

Draft Tube Function:

It reduces the velocity of the fluid and hence increases the pressure of the fluids to the atmospheric level at the tailrace.

Draft Tube Advantages:

This is one of the important components which is used to transform the water into energy.

This finds in the piping system, Dams where turbine difficult to deliver the mechanical work.

Draft tubes Prevent the splashing water coming out of the runner and its guide water to the tailrace.

Draft Tube Application:

This is used to increase the pressure from low turbine exit pressure to the pressure of surrounding to which the fluid is rejected.

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The most valuable and trusted Mechanical Objective book by R S Khurmi 5000+ Objective.

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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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