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Products  |  Fluid Mechanics  |  Hydraulic Fluid Energy Machines  |  HM 288
HM 288 Experiments with a Reaction Turbine Show data sheet (pdf file) Print page
Technical Description

  The conversion of pressure energy into kinetic energy in the impeller is characteristic for reaction turbines.

   The experimental unit is placed upon the base unit HM 290. The two units together provide the basic experiments to get to know the operating behaviour and the most important characteristic variables of reaction turbines.

  The discharged water jet which drives the rotor according to the reaction principle can be observed during operation. This facilitates the understanding of the principle of operation and the underlying laws (eg. momentum).

  HM 288 consists of a turbine impeller mounted in a transparent housing. The loading device is outside of the housing. The eddy current brake generates a defined load. The eddy current brake is specially developed by GUNT. It is wear-free and can be finely adusted.

  The torque delivered by the turbine is determined via an electronic force sensor. The speed is measured with an optical speed sensor. The measuring values are transferred to the base unit HM 290.

  The water supply and the flow rate measurement are realised with the base unit HM 290. A pressure control included in HM 290 enables the

recording of characteristics at a constant height of fall.

  All the advantages of software-supported experiments and evaluation are offered by the GUNT software in HM 290.

  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments

- principle of operation of a reaction turbine

- characteristic curves at constant height of fall

  * relationship between torque and speed

  * efficiency dependent on speed

  * flow rate dependent on speed

  * hydraulic power and mechanical power depending

    on speed

- evaluation of measuring values and characteristics

  based on the theory


* Illustrative model of a water turbine according to the

  reaction principle1
* Adjustable, wear-free eddy current brake as turbine


* GUNT software for data acquisition, visualisation

  and operation1

* Part of the GUNT Labline fluid energy machines

Available accessories
HM 290 -- Base Unit for Turbines
Alternative products
HM 272 -- Air-Operated Reaction Turbine
HM 287 -- Experiments with an Axial Turbine
HM 289 -- Experiments with a Pelton Turbine
HM 291 -- Experiments with an Action Turbine

[1] turbine to place upon the base unit HM 290

[2] functioning and operating behaviour of a reaction turbine

[3] transparent housing for observing the discharged water jet

[4] constant pressure of the turbine represents in practice the height difference and is adjusted via HM 290

[5] turbine load using the wear-free and adjustable eddy current brake 

[6] force sensor to determine the torque on turbine shaft

[7] optical speed sensor for measuring the turbine speed

[8] water supply, flow rate measurement and unit-specific software data acquisition and operation via HM 290


Technical Data

- power output: approx. 60W at 8.000min-1
- rotor diameter: 50mm
Measuring ranges

- torque: 0..0,5Nm
- speed: 0..20.000min-1


Dimensions and Weight
LxWxH: 360x250x180mm
Weight: approx. 5kg
Scope of Delivery
1 experimental unit
1 set of instructional material
Order Details

070.28800  HM 288  Experiments with a Reaction


© 2005 G.U.N.T. Gerätebau GmbH