Turbomachines such as pumps and turbines are energy converters. Turbines convert flow energy into mechanical energy and pumps convert mechanical energy into flow energy.
It can be used to investigate a centrifugal pump. Experiments can be performed on two key water turbine designs: Pelton and Francis turbine, available as accessories.
The closed water circuit comprises a tank, a standard centrifugal pump with variable speed and a flow control valve to adjust the back pressure.
The speed is detected contact-free by means of an inductive displacement sensor on the motor shaft. To determine the drive power, the drive motor is mounted on swivel bearings and equipped with a force sensor to measure the drive torque. Pressures at the inlet and outlet of the pump are measured. The flow rate is measured by means of an electromagnetic flow meter. The measured values are displayed digitally and processed further on a PC. The PC is used to calculate the power output data of the examined turbomachine and to represent them in characteristics.
Learning Objectives And Experiments
- Centrifugal pump
- Measuring inlet and outlet pressures of the pump
- Determining delivery height
- Determining hydraulic output
- Determining mechanical output
- Recording characteristics at various speeds
- Determining the efficiency
- With accessories Pelton turbine or Francis turbine
- Measuring torque and speed
- Determining efficiency of the turbine
- Recording characteristics
- Demonstration of a pumped storage plant
Specification
- Determining characteristic variables of a centrifugal pump
- Determining characteristic variables of water turbines together with the accessories
- Experiments on a pump in a closed water circuit with storage tank and flow control valve to adjust the back pressure
- Experiments on turbines: closed water circuit for supplying turbines
- Pipes and fittings made of PVC
- 3-phase AC motor for pump with variable speed via frequency converter
- Non-contact speed measurement at the turbine shaft and force sensor at the brake for measuring the torque
- Digital displays for pressures, flow rate, speed and torque
Technical Specification
- Standard centrifugal pump
- Max. Head: 23,9m
- Max. Flow rate: 31m3/h
- Drive motor with variable speed
- Power output: 2,2kw
- Speed range: 0…3000min-1
- Storage tank: 250L
- Measuring ranges
- Pressure: 2x 0…4bar abs.
- Flow rate: 0…40m3/h
- Torque: 0…20Nm
- Speed: 2x 0…4000min-1
- 230V, 50Hz, 1 phase
- 230V, 60Hz, 1 phase
- 230V, 60Hz, 3 phases
