What is the approximate number of blades prescribed by Tydul for a Pelton turbine?
1
\(Z=\left(20+\dfrac{D}{2d}\right)\)
2
\(Z=\left(15+\dfrac{D}{2d}\right)\)
3
\(Z=\left(15+\dfrac{2D}{d}\right)\)
4
\(Z=\left(20+\dfrac{2D}{d}\right)\)
5
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