Axial Flow Turbo-Machines Model FM 87

The core piece of the experimental plant is the Sci-tech Axial Turbo-machine Model FM 87 with attached motor/generator.

Item Description

It can be operated either as a pump or turbine. To this end, different sets of paddles are used. The transparent housing allows a full view of the blades and flow processes. A compressed-air powered equalization basin can quickly flood the system. Operation under different pressure levels is possible in order to study the cavitation. The braking power is fed back into the grid. A water tank allows the turbo-machine to be converted without loss of water. In turbine mode the turbo-machine is driven by means of a powerful pump. The extra rotors and stators supplied with different blade angles allow sophisticated experiments. Velocity triangles can be used for the graphical representation of the velocity conditions at the water inlet and outlet as well as within the turbo machine. 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. The differential pressure is detected radially in different blade planes by means of a 3 hole probe. Manometers measure the inlet and outlet pressures. The flow rate is measured by an electromagnetic flow meter. The measured values are read from digital displays. The experimental plant contains a closed water circuit with tank and centrifugal pump. The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


* Investigation of a single-stage axial turbo-machine

* Can be operated as pump or turbine by changing the paddels

* Transparent working area

Technical Specifications


[1] investigation on an axial flow turbo-machine

[2] closed water circuit with tank and centrifugal pump

[3] turbo-machine may be operated as a turbine and as a pump

[4] two sets of paddles for pump mode and two sets of paddles for turbine mode with different entry and exit angles

[5] asynchronous motor/generator with 4-quadrant operation via frequency converter

[6] regenerative feedback of the brake energy

[7] motor with pendulum bearing, torque measurement via lever arm and force sensor

[8] inductive speed sensor on the motor

[9] manometer for measuring the inlet and outlet pressures

[10] measuring probe and differential pressure sensor for recording the pressure curve in the turbo-machine

[11] electromagnetic flow meter [12] display of power consumption, torque, speed, pressure, differential pressure and flow rate

Technical Specifications

Centrifugal pump

– power: 5,5kW

– max. flow rate: 150m³/h

– max. head: 10m


– power: 1,5kW

– torque: 0…5Nm

– speed: 0…3000min-1

Water tank: 150L

Measuring ranges

– pressure (manometer): 2x -1…5bar

– differential pressure: 5x 0…500mbar

– flow rate: 0…150m³/h

– speed: 0…9999min-1

– torque: 0…5Nm


– recording characteristic curves

– determining dimensionless characteristics

– velocity triangles and pressure curves

– investigation of energy conversion within the turbo-machine

– how blade shape affects power and efficiency

– determine the outlet angular momentum and its effect on the power – cavitation effects

Services Required
– Mains power supply: 220-240V, 1Ph, 50Hz

– Compressed air connection: 3…10bar