How does the Axial Fan work?

An Axial Fan blade works on the same principle as how an aircraft wing produces lift. The wing of an aircraft has an aerofoil shape which is pushed forward the air is diverted above and below the wing. The air above the wing has a journey farther than the air under the wing which results in a difference in airspeed above and below the wing. Higher velocity air currents above the wings have higher dynamic strength which results in lower static pressure. Under the wing, air moves slower which means it has a lower dynamic force and higher static pressure. The higher pressure difference under the wing and the lower pressure above it produces lift.

In the case of Axial Fan, we use impeller blades like aerofoil, but instead of producing lift, we keep the fan blades rotating in a stable axis and this creates airflow. It follows Newton's third law of motion that for each action there is an equal and opposite reaction. The air above the aerofoil is pulled to the fan by reducing static pressure and being pushed out through the fan creates a positive pressure area.

To direct the air flow and get optimal performance, we use a mounting plate with a bell-shaped inlet cone to create a smooth laminar flow to the fan suction side. The fan is held centrally on the mounting plate by a mounting guard that maintains a small tip distance between the fan and bell mouth.

There are other methods for installing Axial Fan including placing it in a plain diaphragm hole or within a short radius, but this mounting method compromises performance. Using a full bell mounting plate will ensure that the optimum performance of the fan will be achieved.