14-02-2013, 02:59 PM
impulse turbines - Pelton wheels
1impulse turbines.pdf (Size: 832.14 KB / Downloads: 196)
Design of Pelton Wheels
Pelton wheel is designed with the following input:
1. Head of water
2. Power to be developed
3. Speed of the runner
Pelton wheel is designed to find out the following data:
1. Diameter of the wheel (D)
2. Diameter of the jet (d)
3. Size (i.e. width and depth) of the buckets
4. Number of buckets (z)
Pelton wheel is usually designed with the following assumption:
1. Overall efficiency, ηo between 80% and 87%
2. Coefficient of velocity, Cv as 0.98 to 0.99
3. Ratio of peripheral velocity to the jet velocity, U/C1 as 0.43 to 0.48