The theoretical maximum efficiency of a Pelton wheel turbine with friction is given by:
where β = blade angle, k = friction less coefficient
1
\(\frac{1+\cos \beta }{2}\)
2
\(\frac{1-\cos \beta }{2}\)
3
\(\frac{1+k\cos \beta }{2}\)
4
\(\frac{1-k\cos \beta }{2}\)
5
\(\frac{1+k\sin \beta }{2}\)