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Fans and axial/radial compressors

A characteristic of fans is the pressure ratio, which indicates the ratio of the absolute final pressure to the absolute intake pressure. Fans are different from compressors because of their low pressure ratio of max. 2,5.

Fans (basic knowledge)

Compressors (basic knowledge)

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HM 280

Experiments with a radial fan

Operating behaviour and characteristic variables of a radial fan; two interchangeable rotors

Learning objectives/experiments

operating behaviour and characteristic variables of a radial fan
recording the fan characteristic (pressure difference as a function of the flow rate)
effect of the rotor speed on the pressure
effect of the rotor speed on the flow rate
effect of different blade shapes on the fan characteristic and efficiency
….

HM 282

Experiments with an axial fan

Operating behaviour and characteristic variables of an axial fan

Learning objectives/experiments

operating behaviour and characteristic variables of an axial fan
recording the fan characteristic (differential pressure as a function of the flow rate)
effect of the rotor speed on the pressure
effect of the rotor speed on the flow rate
stall
….

HM 292

Experiments with a radial compressor

Two-stage compressor: recording of the compressor curve for both stages

Learning objectives/experiments

operating behaviour and characteristic variables of a radial compressor
recording of the compressor curve for both stages
effect of the rotor speed on the pressure
effect of the rotor speed on the flow rate
distribution of stage pressure ratios
….

HM 210

Characteristic variables of a radial fan

Determination of flow rate via iris diaphragm or Venturi nozzle

Learning objectives/experiments

setup and principle of a radial fan
plotting fan and system characteristics
flow rate measurement methods based on the differential pressure method using:
- iris diaphragm
- Venturi nozzle
  ….

HM 215

Two-stage axial fan

Determining the characteristics of a two stage axial fan

Learning objectives/experiments

determining the fan characteristic
series configuration or individual operation of axial fans
determining the energy balance
determining the radial pressure and velocity distribution on rotor and guide vane system by means of a probe
effect of the blade position

HL 710

Air duct systems

Planning and setup of simple and complex air duct systems

Learning objectives/experiments

plan, setup and test air duct systems
typical components of ventilation technology
measure the flow rate and velocity of the air
measure dynamic and static pressures
determination of the pressure loss via different components: pipe bends, angles, distributors etc.
….

Equipment for Engineering Education

Fans and axial/radial compressors

HM 280

Learning objectives/experiments

HM 282

Learning objectives/experiments

HM 292

Learning objectives/experiments

HM 210

Learning objectives/experiments

HM 215

Learning objectives/experiments

HL 710

Learning objectives/experiments

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