DESCRIPTION

The Armfield Axial Fan Demonstration Unit is fitted with electronic sensors to measure the pressure head developed across the fan, the pressure across the orifice plate (and hence the flow rate), the rotational speed of the fan and the air temperature.

The fan speed is controlled by modulated dc supply complete with current sensing to enable the power drawn by the fan to be measured.

The Armfield axial fan demonstration unit is mounted on a stainless steel plinth. Transparent air inlet and air outlet ducts allow the fan construction to be clearly observed. A manually operated adjustable aperture allows the air flow rate to be varied.

A calibrated orifice plate is used on the discharge to measure the air flow rate. Electronic sensors measure the pressure head developed across the fan, the pressure across the orifice plate (and thus the flow rate), the rotational speed of the fan and the air temperature.

The fan speed is controlled by modulated DC supply complete with current sensing to allow the power drawn by the fan to be measured.

DEMONSTRATION CAPABILITIES

• Measurement of inherent-speed machine performance in terms of static and total pressures, rotor speed and motor input power as a function of inlet flow
• Measurement of overall efficiency and estimation of impeller power efficiency
• Measurement of performance at constant speeds
• Introduction to similarity laws for scale-up
• Comparison of student calculations with computer results

TECHNICAL SPECIFICATIONS

Max flow rate: 38 l/s typical

Max head: 0.06kPa

Max fan speed: 2,700rpm

Motor power rating: 5W

2 x pressure sensors: 0 to 2.5mBar

Inlet Duct Diameter: 123mm

Infrared Sensor to measure Fan Speed

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