Experiments with an Action Turbine HM 291

Experiments with an Action Turbine

Type: HM 291
Name: Experiments with an Action Turbine
Technical Description

  Action turbines operate according to the principle of equal pressure. The static pressures at the inlet and at the outlet of the rotor 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 at high velocity from the four nozzles of the distributor. The water jets are deflected in the rotor and put it in motion. The axially discharged water from the rotor can be observed.

  HM 291 consists of a rotor, 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 head.

  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 head

  * 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 -- 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
GUNT Labline

[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 rotor

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

[5] constant pressure of the turbine represents in practice the head 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 3600min-1
- rotor diameter: 50mm

Measuring ranges

- torque: 0..0,5Nm
- speed: 0...9000min-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