lab 4_ Francis turbine - 7 Lower the braking device 8...

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Jazan University Faculty of Engineering Mechanical Eng. Dept. Hydraulic Machines and Fluid Energy Systems (EngM 426) Experiment Report Performance Curves of a Francis Turbine Student Name: ---------------------------------------------------------------- Student ID:
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Hydraulic Machines & Fluid Energy Systems (EngM 426) 1. Objective : Determine performance curves of the Francis turbine at constant head. 2. Apparatus : Hydraulic bench, Francis turbine, brake drum, digital tachometer and pressure gauge. Dr. Ahmed Bagabir Page 3 of 8
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3. Procedure : 1. Switch on the pump. 2. Fully open the control valve of the bench. 3. Fix guide vane position (eg. 1-10). 4. Set the brake free (e.g. zero torque). 5. Take the reading necessary to calculate the volume flow rate. 6. Take the reading of torque, speed and pressure of the inlet flow.
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Unformatted text preview: 7. Lower the braking device. 8. Repeat steps 6-7 for different turbine speeds. 4. Readings : Guide vane position = 5 No. Torque ( N.m ) Pressure ( bar ) H (m) 1 1.43 14.5 2 0.7 0.9 9.1 3 1.15 0.65 6.6 4 1.4 0.55 5.6 5 1.7 0.51 5.1 6 1.9 0.56 5.7 5. Calculations : No. N (rpm) Q ( l/h ) Pm ( W ) Pw ( W ) η ( % ) 1 3100 11900 472.6944 2 2100 14600 365 153.86 42.15342 3 1500 17000 306.9444 180.55 58.82172 4 1000 17500 267.3611 146.5333 54.80727 5 500 17900 253.5833 88.96667 35.0838 6 16600 258.2222 Sample calculations: 6. Results and Discussion : Fig. 1: Flowrate against speed. Fig. 2: Mechanical and hydraulic power against speed. Fig. 3: Efficiency against speed....
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