VELOCITY TRIANGLES, WORKDONE, EFFICIENCY OF PELTON WHEEL INLET AND OUTLET VECTOR DIAGRAMS



Let V = Velocity of the jet
u = Velocity of the vane (cups) at the impact point
u =    DN/ 60

where  D = Diameter of the wheel corresponding to the impact point
= Pitch circle diameter.
At inlet the shape of the vane is such that the direction of motion of the jet and the
vane is the same. i.e., Ȑ = 0, ș = 0
Relative velocity at inlet    Vr  = V  —u


































Hydraulic efficiency

This is the ratio of the work done per second per
head at inlet to the turbine. Energy head at inlet = V2/2g



SPECIFIC SPEED

The  speed  of  any  water  turbine  is  represented  by  N  rpm.  A  turbine  has  speed, known as specific speed and is represented by N
‘Specific speed of a water turbine in the speed at which a geometrically similar turbine would run if producing unit power (1 kW) and working under a net head of
1 m. Such a turbine would be an imaginary one and is called specific turbine.





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