Axial Flow FanDemonstration Unit Model GFM 41A

The Sci-tech Axial Flow Fan Demonstration Model GFM 41A is a self contained bench top unit designed to demonstrate the working of axial flow fan and to conduct experiments to study the performance of a typical axial flow fan.

Item Description

Axial flow fan is a device in which air flows in the axial direction and energy transfer takes place from the rotating rotor to the surrounding fluid. The rotor consists of blades and the kinetic energy of air is increased by the momentum transfer during the passage of air through the blades. Axial flow fans are used in several applications involving higher flow rates and lower delivery pressures, such as air conditioning, air circulation, aircraft engines and power plants and cooling. Study of the characteristics of axial flow fans is an important topic in turbo-machinery.
The Sci-tech Axial Flow Fan Demonstration Model GFM 41A is an important equipment for fluid-machinery or turbo-machinery laboratories of mechanical, aeronautical, chemical and propulsion engineering departments of educational institutions.

It consists of a duct in which a single stage axial flow fan rotates and sucks air at one end of the duct and delivering air at the other end. A major portion of the ducting is transparent and permits visual observation of the working of the fan and the measurement system. The fan is driven by a variable speed motor. The differential pressure across the fan is measured using the electronic transducer. The air flow rate through the fan can be varied using the adjustable aperture device and flow rate is measured using an orifice plate. Temperature of air at inlet and the rotational speed of the impeller are measured. Control panel with the digital display of measured parameters is provided. Computer based data acquisition and processing system with software is provided.

Technical Specifications

List of experiments:
1. Study of the working principle of an axial flow fan.
2. Measurement of static and total pressure rise across the fan, flow velocity and volume flow rate through the fan, fan inlet temperature, rotational speed of the impeller and power input to the fan motor.
3. Determination of overall efficiency of the fan and estimation of the impeller efficiency at constant rotational speed and various flow rates.
4. Determination of performance at different rotational speeds.
5. Presentation of performance test results in dimensionless form and introduction to similarity laws.
6. Conduct performance tests in manual mode and compare with the results obtained using computer based data acquisition and processing.

Important features and specifications:
1. Axial flow fan, single stage, max. pressure: 0.1 kPa., max. flow : 0.05 m3/s. .
2. Motor, variable speed induction type, 20W.
3. Duct, Plexiglas, 100mm diameter.
4. Inlet section with bell mouth.
5. Flow straightener.
6. Adjustable aperture device.
7. Power meter, 50W.
8. Orifice plate for air flow measurement.
9. Differential pressure across fan and orifice plate.
10. Differential pressure transducers (2 Nos.) with digital display.
11. Thermocouple, 1000C with digital display for air inlet temperature.
12. Optical speed sensor for impeller speed, 1500 RPM.
13. Control panel.
14. PC based data acquisition and processing system including latest Pentium processor, electronic signal conditioning system and stand alone data acquisition modules.
15. Windows based data acquisition software for data logging, signal analysis, process control, real time display, tabulation of results and preparation of graphs of experimental results.
The manual describing the theoretical and practical aspects of the apparatus, operation, maintenance and analysis of results will be supplied with the equipment.

Services required:
Electrical supply, 220 V, single-phase, 50 Hz.

Overall dimensions:
Depth: 0.4m, Width: 0.75m, Height: 0.4m.