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Draft Tube is a diverging tube fitted at the exit of runner of turbine and used to utilize the kinetic energy available with water at the exit of runner. '. This draft tube at the end of the turbine increases the pressure of the exiting fluid at the expense of its velocity.

Draft tubes are mainly classified in 4-types, and those are:

Simple Elbow draft tube. Elbow with a varying cross-section area. Moody Spreading tube. Conical Diffuser or Straight divergent.

Is draft tube used in impulse turbine?
In impulse turbines, the flow energy of the fluid is converted to kinetic energy by means of the nozzle. ... Draft tubes are used in Reaction turbines to convert K.E into useful pressure energy.


Why draft tube is used in Francis turbine?
The draft tube is an important component of a Francis turbine which influences the hydraulic performance. It is located just under the runner and allowed to decelerate the flow velocity exiting the runner, thereby converting the excess of kinetic energy into static pressure.

draft tube types

draft tube theory pdf

why draft tube is used in francis turbine

draft tube ppt

a draft tube is used with impulse turbine

the function of draft tube is to mcq

efficiency of draft tube formula

the pressure at the inlet or exit of the draft tube should not be