To conduct the performance test on Francis turbine under constant head and to plot the operating characteristics.
Francis Turbine Setup with Centrifugal Pump, Pressure Gauges, Spring Balance with Weights etc.
Start the pump by pressing the start button and select the head.
Open the inlet valve to keep the pressure constant.
Constant Head (H) =
Apply the weight on the pan and note the spring balance reading.
Radius of brake drum (R)= 0.15 m
Dead weight of the pan =
Spring balance reading =
Torque =
τ (N-m) = (W - S)×R×gInsert the tachometer to note the speed of the motor.
Speed of motor (N) =
Take the hook gauge reading to find the discharge.
Initial reading (water level till crest) =
Final reading =
Head of water (h) =
Actual discharge, Qact =
Qact (m3/sec) = 2⁄3×Cd× l × √(2g) × h(3⁄2)Speed of motor (N) =
Torque (τ) =
Constant Head (H) =
Actual discharge, Qact =
Specific Weight of water = 9810N/m3
Input power =
Input Power (W) = γ × Qact × 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⁄√HTrial =
Both ends of the pipe must be trimmed to ensure parallel faces.