Vo = Viro / ri = 0.33 √2gH.
Angle of Vanes with Outlet Surface.
Tan φ = uo / Vo = 0.125 / 0.33 = .3788;
φ = 21º nearly.
If this value is revised for the vane thickness it will ordinarily become about 25º.
Velocity with which the Water enters the Wheel.—The head producing the velocity is
| H − (Vi2 / 2g) (1 + uo2 / Vi2) + ui2 / 2g = H {1 − .4356 (1 + 0.0358) + .0156} = 0.5646H. |
Then the velocity is
Vi = .96 √2g (.5646H) = 0.721 √2gH.
Angle of Guide-Blades.