To conduct performance test on Pelton wheel under constant head and to plot the operating characteristics.
Pelton Wheel setup with Centrifugal Pump, Pressure Gauges, Spring Balance with Weights, etc.
Start the pump by pressing the start button and select the head.
Rotate the inlet valve to keep the head of water to be constant.
Constant pressure =
Constant head (Hd) =
Apply the weight on the pan and note the spring balance reading for the corresponding applied weight.
Radius of brake drum (R) = 0.15 m
Dead weight of the pan (W) =
Spring balance reading (S)=
Torque (τ) =
τ (N-m) = (W - S) × R × gNote the speed of the motor.
Speed of motor (N) =
Note the hook gauge reading to find the discharge.
Initial reading (water level till crest) =
Final reading =
Head of water (h)=
Actual discharge, Qact =
Q (m3/sec) = ( 8⁄15) × Cd × √(2g) × tan(θ/2) ×h( 5⁄2)Gate opening = 50%
Specific Weight of water (γ) = 9810N/m3
Actual discharge, Qact =
Constant head (Hd) =
Speed of motor (N) =
Torque (τ) =
Input power =
Input Power (W) = γ × Q × HOutput power =
Output Power (W) = (2 × π × N × τ)⁄60Efficiency =
Efficiency (%) = Output Power⁄Input Power × 100Unit power =
Unit power (W) = Output Power⁄√(H3)Unit speed =
Unit speed (rpm) = N⁄√HUnit discharge =
Unit discharge (m3/sec) = Qact⁄√(H3Trial =
Both ends of the pipe must be trimmed to ensure parallel faces.