Of greater concern is what happens in the turbulent water of the draft tube.
However, it provides features such as an expandable draft tube that offer flexibility.
The side zipper is insulated by a full-length draft tube.
Down-insulated draft tube backs the full-length zipper to keep the cold out.
A hydraucone is a form of draft tube used with a hydro turbine.
There are several shapes for a bell-mouth draft tube.
The purpose of providing a draft tube will be better understood if we carefully study the net available head across a reaction turbine.
The height of draft tube is an important parameter for avoiding cavitation.
In addition, both the top and bottom draft tubes backing the zippers are fully insulated.
The zipper is fully insulated with a draft tube running its length.