AFF060 Characteristic Variables of a Radial Fan Vocational Training Equipment Fluid Mechanics Experiment Equipment
Description
Fans are key components of ventilation systems, providing ventilation, cooling, drying or pneumatic transport. For optimum design of such systems, it is important to know the characteristic variables of a fan.
AFF060 investigates a radial fan. This trainer determines the interdependencies between the head and flow rate as well as the influence of the fan speed on the head and flow rate.
The radial fan aspirates the air in axially from the surrounding environment. The highspeed rotating rotor accelerates the air outwards. The high velocity at the outlet from the rotor is partially converted into pressure energy in the spiral housing. The vertical pipe section is connected to the spiral housing. A Venturi nozzle to measure the flow rate and a throttle valve to adjust the flow rate are inserted into the pipe section. An iris diaphragm can optionally be used. Its variable crosssection enables simultaneous adjustment and determination of the flow rate. The effective pressures to calculate the flow rate are read from liquid column manometers. The head of the radial fan is likewise measured by liquid column manometers. Utube manometer, single tube manometer and inclined tube manometer with graduated measuring ranges are available.
A frequency converter is used to adjust the fan speed. The speed, torque and electric power capacity are digitally displayed. This permits energy analyses, and enables the efficiency of the fan to be determined.
The system characteristic curve is determined by recording the characteristic variables at a constant throttle setting but at variable speed. The interaction of the fan and system at the operation point – the socalled system dimensioning – is investigated.
Specification
1.radial fan as turbomachine
2.iris diaphragm or Venturi nozzle to determine flow rate via the differential pressure
3.speed adjustment by frequency converter
4.Utube manometer, single tube manometer and inclined tube manometer measure the differential pressure
5.air flow rate in pipe section adjustable by throttle valve or iris diaphragm
6.speed, torque and electric power capacity digitally displayed