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Products  |  Fluid Mechanics  |  Hydraulic Fluid Energy Machines  |  HM 280
HM 280 Experiments with a Radial Fan Show data sheet (pdf file) Print page
Technical Description

  Radial fans are used to transport gases with non-excessive pressure differences. The medium is sucked in axially to the drive shaft of the radial fan and is deflected by 90 by the rotation of the impeller and discharged radially.
  The experimental unit provides the basic experiments to get to know the operating behaviour and the most important characteristic variables of radial fans.

  HM 280 features a radial fan with variable speed via frequency converter, an intake pipe and a delivery pipe. The transparent intake pipe is fitted with guide plates for flow guidance and with a flow straightener to calm the air. This enables precise measurements even with heavily reduced operation. The air flow is adjusted by a throttle valve at the end of the delivery pipe. 
  To demonstrate the effect of different blade shapes two impellers are included in the scope of delivery: one impeller with forward curved blades and one with backward curved blades. The impellers are easily interchangeable.

  The experimental unit is fitted with sensors for pressure and temperature. The flow rate is determinated via differential pressure measurement on the intake nozzle.
  The microprocessor-based measuring technique is well protected in the housing. All the advantages of software-supported experiments and evaluation are offered by the GUNT software and the microprocessor. The connection to a PC is made by USB.

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


Learning Objectives / Experiments

- operating behaviour and characteristic variables of

  a radial fan
- recording the fan characteristic (differential

  pressure as a function of the flow rate)

- effect of the impeller speed on the pressure

- effect of the impeller speed on the flow rate
- effect of different impeller shapes on the fan

  characteristic and efficiency

- determination of hydraulical power output and



* 2 interchangeable impellers1
* Transparent delivery pipe and intake pipe1
* GUNT software for data acquisition, visualisation

  and operation1

* Part of the GUNT Labline fluid energy machines

Alternative products
HM 210 -- Characteristic Variables of a Radial Fan
HM 240 -- Principles of Airflow

[1] functioning and operating behaviour of a radial fan

[2] radial fan with 3-phase AC motor

[3] variable speed via frequency converter

[4] transparent intake and delivery pipes
[5] throttle valve to adjust the air flow in the delivery pipe
[6] interchangeable impellers: 1 impeller with forward curved blades and 1 impeller with backward curved blades
[7] determination of flow rate via intake nozzle

[8] display of differential pressure, flow rate, speed, electrical power consumption and hydraulical power output, temperature and efficiency
[9] microprocessor-based measuring technique

[10] unit-specific GUNT software for data acquisition and operation via USB under Windows XP,  Windows Vista or Windows 7 

Technical Data

Intake pipe
- inner diameter: D=90mm
- length: L=430mm
Delivery pipe
- inner diameter: D=100mm
- length: L=530mm
Radial fan
- power consumption: 110W
- nominal speed: 2.800min-1
- max. flow rate: 480m/h
- max. differential pressure: 300Pa
Displayed / measuring ranges
- differential pressure: 0...1.800Pa
- flow rate: 0...1.000m/h
- temperature: 0...100C

- speed: 0...3.300min-1

- electrical power consumption: 0...250W


Dimensions and Weight
LxWxH: 670x340x940mm
Weight: approx. 20kg
Required for Operation
230V, 50/60Hz, 1 phase
Scope of Delivery

1 experimental unit
2 impellers

1 GUNT software CD + USB cable
1 set of instructional material

Order Details

070.28000  HM 280  Experiments with a Radial


© 2005 G.U.N.T. Gerätebau GmbH