Home           Products           Company           Contact us     
> Fundamentals of Fluid Mechanics
> Steady Incompressible Flow
> Flow around Bodies
> Steady Flow of Compressible Fluids
> Examples of Transient Flow
> Hydraulic Fluid Energy Machines
> Components in Piping Systems and Plant Design
> Fluidic Experimental Plants
> Hydraulics for Civil Engineering
Products  |  Fluid Mechanics  |  Hydraulic Fluid Energy Machines  |  HM 421
HM 421 Kaplan Turbine Trainer Show data sheet (pdf file) Print page
HM 421 - A product from the GUNT 2E range
Technical Description

  Water turbines are turbomachines which convert water energy into mechanical energy. Mostly, they are used for driving generators for power generation purposes. The Kaplan turbine is a reaction turbine with an axial through flow. It has a high specific speed and is suitable for large water flows and small to medium heads. Therefore, the Kaplan turbine is used as a "classic" water turbine in run-of-the-river power stations.

  The HM 421 helps to investigate the characteristic behaviour of a simple-regulated Kaplan turbine during operation. The trainer is provided with a closed water circuit with tank, submersible pump and throttle valve for adjusting the flow rate. The angle of incidence and thus the power output of the impeller are changed by adjusting the guide vanes. The turbine is loaded with a wear-free eddy current brake. 

  The speed is captured by means of an inductive, non-contact position sensor at the turbine shaft. For determining the turbine power, the eddy current brake is equipped with a force sensor for torque measurement. The pressures at the inlet and outlet of the turbine, the temperature and the flow rate are recorded with sensors.   The recorded measured values are displayed digitally and processed further in a PC. The PC is used to calculate the power output data of the examined turbine and to represent them in characteristic curves.

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

Learning Objectives / Experiments

- Determination of power output curves at different

  * hydraulic power output
  * mechanical power output
- Determination of the head
- Determination of turbine efficiency
- Investigation of the influence of the vane position on

  power output and efficiency 


* Characteristics of a Kaplan turbine1
* Adjustable guide vanes for setting the power output1
* LabVIEW software for data acquisition


[1] Function of a Kaplan turbine
[2] Closed water circuit with submersible pump, throttle valve and tank 
[3] Adjustment of flow rate with throttle valve
[4] Loading the turbine by use of air-cooled eddy current brake
[5] Impeller with fixed vanes
[6] Adjustable guide vanes for setting different angles of incidence
[7] Non-contact speed measurement at the turbine shaft and force sensor at the brake for measuring the torque  
[8] Digital display for pressures, temperature, flow rate, speed and torque
[9] LabVIEW software for data acquisition via USB under Windows XP or Windows Vista


Technical Data

Kaplan turbine
- max. output: 1000W
- max. speed: 3700min-1 
- control wheel
  8 guide vanes, adjustable: -15...45
  external diameter: 120mm, internal diameter: 60mm
- impeller, 4 vanes, fixed
  external diameter: 120mm, internal diameter:

  60mm, pitch: 80mm
Submersible pump with motor
- max. flow rate: 250m/h
- max. pump head: 11m
- nominal power: 3,1kW
Tank: 590L


Measuring ranges
- temperature: 0...100C
- pressure (at turbine inlet): 0...1bar rel.
- pressure (at turbine outlet): -1...0,6bar rel.
- flow rate: 13...200m/h
- torque: 0...10Nm
- speed: 0...6500min-1


Dimensions and Weight
LxWxH: 1450x1150x1650mm
Weight: approx. 270kg
Required for Operation
400V, 50Hz, 3 phases
Scope of Delivery
1 trainer
1 LabView software CD + USB cable
1 set of instructional material
Order Details
070.42100  HM 421  Kaplan Turbine Trainer
© 2005 G.U.N.T. Gerätebau GmbH