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Products  |  Fluid Mechanics  |  Hydraulic Fluid Energy Machines  |  HM 291
HM 291 Experiments with an Action Turbine Show data sheet (pdf file) Print page
Technical Description

  Action turbines operate according to the principle of equal pressure. The static pressures at the inlet and at the outlet of the impeller are equal.

  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 action turbines. 

  The water jets are discharged with high velocity from four nozzles of the distributor. The water jets are deflected in the turbine impeller and put it in motion. The axially discharged water from the turbine impeller can be observed.

  HM 291 consists of a turbine impeller, mounted in a transparent housing, a distributor with four nozzles and a loading device outside of the housing. The number of active nozzles can be adjusted by valves. 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 an action 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 dependent

    on speed

- evaluation of measuring values and characteristics

  based on the theory

- partial load behaviour with controlling the number of

  nozzles in comparison to throttle control


* Illustrative model of an axial constant-pressure

* 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 270 -- Air-Operated Impulse Turbine
HM 287 -- Experiments with an Axial Turbine
HM 288 -- Experiments with a Reaction Turbine
HM 289 -- Experiments with a Pelton Turbine
HM 405 -- Axial-Flow Turbomachines

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

[2] functioning and operating behaviour of an action turbine

[3] transparent housing for observing the turbine impeller

[4] distributor with 4 nozzles, active nozzles adjustable by valves  

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

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

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

[8] optical speed sensor for measuring the turbine speed

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


Technical Data

- power output: approx. 28W at 3.600min-1
- rotor diameter: 50mm

Measuring ranges

- torque: 0..0,5Nm
- speed: 0...9.000min-1


Dimensions and Weight
LxWxH: 420x320x180mm
Weight: approx. 7kg
Scope of Delivery
1 experimental unit
1 set of instructional material
Order Details

070.29100  HM 291  Experiments with an Action


© 2005 G.U.N.T. Gerätebau GmbH