The main purpose of a draft tube is to recover the residual kinetic energy of the water that exits over the turbine.
12.
An elbow-shaped draft tube is less efficient than a bell-mouth tube due to the fluid losses in the turn of the elbow.
13.
The turbine does not need to be at the lowest point of water flow as long as the draft tube remains full of water.
14.
"' Draft tube "': The draft tube is a conduit that connects the runner exit to the tail race where the water is discharged from the turbine.
15.
"' Draft tube "': The draft tube is a conduit that connects the runner exit to the tail race where the water is discharged from the turbine.
16.
Its compact shape makes it suitable for small hydro projects where the excavation is much less than that required for the more conventional elbow shaped draft tube.
17.
In power turbines like reaction turbines, Kaplan turbines, or Francis turbines, a diffuser tube is installed at the exit of the runner, known as "'draft tube " '.
18.
Bluegrass diamond wire saws were ideally suited to the job because of the minimal vibration emitted, therefore avoided the potential hazard of vibrating debris into the draft tubes.
19.
Draft Tube allows turbine to be placed above the tail race and simultaneously allows it to operate at the same efficiency if it was placed at the tail race.
20.
The hydraucone draft tube is very efficient at recovering energy from the rotational motion of the water ( swirl ) as well as the linear motion ( flow ) of the water.
