The core piece of the experimental plant is the axial turbomachine with attached asynchronous motor. It can be operated either as a pump or turbine. To this end, different rotors, impellers and stators, guide vane systems are used. Included in the scope of delivery are four rotors, impellers and four stators, guide vane systems supplied with different blade, vane angles. The experimental plant contains a closed water circuit with expansion tank and centrifugal pump. The compressed-air powered expansion tank allows the turbomachine to be converted without loss of water.
The asynchronous motor functions during turbine operation as a generator, and during pump operation as a drive. A powerful pump generates flow and pressure during turbine operation. The power that is generated by the turbine is fed into this pump.
Learning Objectives And Experiments
- Recording characteristic curves
- Determining dimensionless characteristics
- Velocity triangles and pressure curves
- Investigation of energy conversion within the turbomachine
- How blade, vane shape affects power and efficiency
- Determining the outlet angular momentum and its effect on the power
- Cavitation effects
Specification
- Investigation of an axial flow turbomachine
- Closed water circuit with expansion tank and centrifugal pump
- Turbomachine may be operated as a turbine and as a pump
- Two sets of impellers and guide vane systems for pump mode and two sets of rotors and stators for turbine mode with different inlet and outlet angles
- Asynchronous motor with 4-quadrant operation via frequency converter
- Recovery of the brake energy
- Motor with pendulum bearing, torque measurement via lever arm and force sensor
- Inductive speed sensor on the motor
- Manometers for measuring the inlet and outlet pressures
- Measuring probe and differential pressure sensor for recording the pressure curve in the turbomachine
- Electromagnetic flow meter
- Display of power consumption, torque, speed, pressure, differential pressure and flow rate
Technical Specification
- Centrifugal pump
- Power: 5,5kw
- Max. Flow rate: 150m3/h
- Max. Head: 10m
- Asynchronous motor
- Power: 1,5kw
- Torque: 0…5Nm
- Speed: 0…3000min-1
- Expansion tank: 150L
- Measuring ranges
- Pressure (manometer): 2x -1…5bar
- Differential pressure: 5x 0…500mbar
- Flow rate: 0…100m3/h
- Speed: 0…3000min-1
- Torque: 0…9,81Nm
- 400V, 50Hz, 3 phases
