Why choose an Axial fan
About axial fan:
Why choose an Axial fan
How does an axial fan work?
An axial fan blade works on the same principle as how an aircraft wing generates lift. The wing of an aircraft has an aerofoil shape which as it is propelled forwards the air is diverted above and below the wing. The air above the wing has farther to travel than the air under the wing which results in a difference in air velocity above and below the wing. The higher velocity air stream above the wing has a higher dynamic force which results in a lower static pressure. Below the wing, the air is moving slower which means it has a lower dynamic force and higher static pressure. The difference in higher pressure below the wing and lower pressure above it generates lift.
In the case of a fan we use an impeller blade like an aerofoil however instead of generating lift we keep the fan blades rotating in a stable axis and this creates airflow. This follows Newton’s third law of motion that for each action there is an equal and opposite reaction. The air above the aerofoil is drawn into the fan by the reduction in static pressure and pushed out through the fan creating a positive pressure area.
To direct the airflow and obtain optimum performance, we use a mounting plate with a bell-mouth shaped inlet cone to create a smooth laminar flow into the suction side of the fan. The fan is held centrally in the mounting plate by the mounting guard which maintains a small tip clearance between the fan and bell-mouth.
There are other methods of mounting an axial fan including placing it in a plain diaphragm hole or in a short radius, however, these mounting methods compromise performance. Using a full bell-mouth mounting plate will ensure that optimum performance from the fan will be achieved.
why choose an axial fan?
When a relatively high-volume flow is required in a low-pressure system and axial fan should be considered. The fan should be selected within its optimum range either at the point of peak efficiency or below. The point of peak efficiency is an area known as the knee of the fan characteristic curve where it is also is operating at its quietest. Operating in what is known as the stall dip and at system pressures above this point must be avoided. The turbulence and the aerodynamic efficiency of the impeller blade in the stall dip and above creates noise and may cause the motor to overload.
Air on the inlet side of the impeller should be kept as smooth and laminar as possible to maximise the efficiency of the impeller blade. Using a full bell-mouth mounting plate and eliminating flow disturbances before the air is drawn through the fan will reduce noise and keep the power consumption at the duty point to a minimum.
Where to buy Axial fan
AFL Fan Equipment Factory is a leading China centrifugal fan supplier and axial fan manufacturer. We have our own production workshop and design team. If you cooperate with us, we can provide you with first-hand prices.
Welcome to choose AFL Fan Equipment Factory - a leading China centrifugal fan supplier and axial fan manufacturer.
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