A draft tube is a diverging tube fitted at the exit of a turbine's runner and used to utilize the kinetic energy available with water at the exit of the runner. This draft tube at the end of the turbine increases the pressure of the exiting fluid at the expense of its velocity.
A draft tube is a diverging tube fitted at the exit of a turbine's runner and used to utilize the kinetic energy available with water at the exit of the runner. This draft tube at the end of the turbine increases the pressure of the exiting fluid at the expense of its velocity.
Source: Wikipedia "Draft tube" · CC BY-SA 4.0
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