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Working principle of axial flow fan

May 08, 2020

When the impeller rotates, the gas enters the impeller axially from the inlet, which is pushed by the blade on the impeller to increase the energy of the gas and then flows into the guide vane. The guide vane changes the deflection air flow into axial flow, at the same time, the gas is introduced into the diffuser tube, and the gas kinetic energy is further converted into the pressure energy, and finally the working pipeline is introduced.

Axial fan blades work in a similar way to the wings of the aircraft. However, the latter is to act lift up on the wing and support the weight of the aircraft, while the axial fan is fixed and moves the air.

The cross section of axial fan is generally wing section. The blade can be fixed or rotated around its longitudinal axis. The angle between the blade and the airflow or the distance between the blades can be unadjustable or adjustable. Changing blade angle or spacing is one of the main advantages of axial flow fan. the small blade spacing angle produces a lower flow rate, while increasing the spacing produces a higher flow rate.

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