Radial fans are used to transport gases with nonexcessive pressure differences.
The experimental unit HM 280 provides the basic experiments to get to know the operating behaviour and the important characteristic variables of radial fans. The software for data acquisition and visualisation makes the experiments especially clear and enables fast execution of experiments with reliable results.
The radial fan with flanged drive motor features free speed adjustament. The transparent intake and delivery pipes enable stable stationary flow conditions. The air flow is set by a throttle valve at the end of the pressure 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 rear curved blades. The impellers are easy to replace.
Using the software the differential pressure, flow rate, speed, power and temperature are displayed and characteristics recorded. The flow rate is determinated via measured differential pressure.
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 (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
Determination of hydraulical power output and efficiencies
Specification
Functioning and operating behaviour of a radial fan
Radial fan with 3-phase AC motor
Variable speed via frequency converter
Transparent intake and delivery pipes
Throttle valve to adjust the air flow in the delivery pipe
Interchangeable rotors: 1 rotor with forward curved blades and 1 rotor with backward curved blades
Determination of flow rate via intake nozzle
Display of differential pressure, flow rate, speed, electrical power consumption and hydraulical power output, temperature and efficiency
Microprocessor-based measuring technique
Unit-specific software for data acquisition and operation via USB under Windows Vista or Windows 7