Axial fan can be traced back to medieval wind turbines […]
Axial fan can be traced back to medieval wind turbines in Europe. The first electric fan introduced in the 1880s was an axial fan. Axial fans are named in the direction of the airflow they produce. The blades that rotate about an axis draw in air parallel to the axis and discharge air in the same direction. Axial fans produce a high flow of air, which means they generate a large amount of air flow. However, they create low airflow pressure. They need a low-power input operation.
An axial fan is a compressor that increases the pressure of the air flowing through it. The blades of the axial fan force the air to move parallel to the axis about which the blades rotate. Axial fan design gives priority to the design of the propeller, creating a pressure differential that keeps the suction flowing through the fan. The main components to be studied in the design of a propeller include the number of blades and the design of each blade. Applications include aircraft, helicopters, hovercraft, ships and hydrofoil propellers. They are also used for wind tunnels and cooling towers. If the propeller is advancing, then efficiency is the only parameter of interest, and other parameters, such as power requirements and flow, are not considered to be of interest. If the propeller is used as a fan, the parameters of interest include power, flow rate, pressure rise and efficiency.
Compared to duct-type fans, axial fans are made of fewer blades, ie 2-6. Axial fans run at high speed, high flow and low lift, so adding more blades will limit the high flow required for their operation. Because of the small number of blades, they can not impose their geometry on the flow, rendering the rotor geometry and inlet and outlet velocities meaningless. In addition, the leaves are made very long, varying along the radius of the blade part.
On the other hand, axial fans are widely used in small cooling fans for electronics, mega fans used in wind tunnels, and various other applications. However, you may be familiar with these because they are commonly used for regular table fans. These types of blades force the air to move parallel to its axis of rotation. The blades of the fan may be flat or curved plates or may have a shape similar to the cross-section of the fins which may be raised to the wing of the aircraft.