1.Description
Turbomachines such as pumps and turbines are energy converters. Turbines convert flow energy into mechanical energy and pumps convert mechanical energy into flow energy.
HM 450C can be used to investigate a centrifugal pump. Experiments can be performed on four key water turbine designs: Pelton, Francis, and Kaplan turbine, available as accessories. Also there is a Francis pump.
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.
One of the turbines Pelton, Francis, and Kaplan turbine, can be placed on top of the storage tank. The centrifugal pump supplies the turbine with water. The measured values of the turbine are transfered via cable to the bench. A special feature of the bench is the ability to operate pump and turbine at the same time. Relevant measured values are recorded contemporaneously at both turbomachines. Thus the trainer can be used as a pumped storage plant.
2.Specification
determining characteristic variables of a centrifugal pump
determining characteristic variables of water turbines together with the accessories Pelton, Francis, and Kaplan turbine, 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
software for data acquisition via USB under Windows 8.1, 10 3. Technical data
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
UL/CSA optional
