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HM 291 Axial-Flow Impulse Turbine Demonstrator
Education / GUNT Hamburg / Fluid Mechanics and Hydrology / Hydraulic Fluid Energy Machines /


 Axial flow impeller turbine demonstration model, designed for use in conjunction with the HM 290 Turbine Service Unit. The turbine unit is placed on the Turbine Service Unit and supplied with water by the service unit. The turbine housing is made of Plexiglass so that the axial water jet can be clearly observed. A braking device is fitted to the impeller shaft of the turbine. The braking device is in the form of a band brake. The load and moment on the turbine shaft is measured with a strain gauge fitted to the braking device. An inductive proximity switch measures the rotational speed of the turbine. The following accessories are required for operation: an Interface Module (HM 280.01), Data Acquisition Card with Software (HM 280.03) and Set of Connecting Cables (HM 280.04). Using these accessories it is possible to process and store the measured data on a PC.

Learning Objectives / Experiments
· Determination of the power output
· Determination of the efficiency
· Preparation of the characteristic curve
· Comparison of experiment and calculation
[1] Axial flow impeller turbine demonstration model
[2] Water supplied to the turbine using the HM 290 Turbine Service Unit
[3] Electronic measurement of the moment on the turbine shaft using a band brake
[4] Electronic measurement of the turbine rotational speed with inductive proximity switch
[5] Transparent turbine housing
[6] Turbine approx. 50W, turbine rotor diameter 50mm
[7] Processing of measured data on a PC
Technical Data
Rating: approx. 6W at 2000rpm
Rotor diameter: 50mm

Moment measurement
Measuring range: 0..0.5Nm

Speed measurement
Measuring range: 0..10000rpm
Dimensions and Weight
l x w x h: 450 x 300 x 200 mm
Weight : approx. 20 kg
Required for Operation
Water supply from HM 290
Scope of Delivery
1 turbine, complete with connecting hose, 
1 instruction manual
Order Details
070.29100 HM 291 Axial- Flow Impulse Turbine Demonstrator