Before the nineteenth century, ventilation of premises was done by means of natural airing. The theory of natural movement of air in ducts and pipes was created by M.V. Lomonosov. That was the beginning of millions of studies that eventually led to the invention of the first fan.
Axial fans are considered to be the simplest and the cheapest fans. Axial fans are used for supply or exhaust ventilation of residential, public and industrial buildings, as well as for ventilation and cooling of various devices. They are assembled mostly in window or wall openings. Axial fans provide a good performance, but if an obstacle occurs on the way of the airflow, its speed decreases significantly. Therefore, in ventilation systems with an extensive network of air ducts centrifugal fans are used that are characterized by the high pressure of the created air flow.
So what is an axial fan? It is a wheel of console blades, which is located in a cylindrical casing. The blades move the air along the axis around which they rotate. During the work of an axial fan, there is practically no radial movement of air. To significantly improve the aerodynamic characteristics in the process of the work of an axial fan, a collector is installed at the input.
The main difference of axial fans from all other fans is a substantially higher efficiency factor. To control the flow and pressure, the turn of blades is required. In addition, axial fan blades have a much smaller size. Their main purpose is the use of very large amounts of air for delivery with small aerodynamic resistance found in the network.
Examples of use of axial fans: small electronics cooling fans (coolers), fans for turbofan aircraft engines, fans of wind tunnels, etc.