Question

What is draft tube? Discuss different types of the draft tube

Answer 1

Basically, Draft tube is a conduit which connects the runner exit to the tailrace where the water is being finally discharged at atmospheric pressure from the reaction turbine.

Conical draft tube

Simple elbow draft tube

Elbow draft tube with varying cross section - circular inlet and rectangular outlet

Moody's spreading draft

Hope this helps you❤

Answer 2

Answer:

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.