Axial flow fan is a fan with a wide range of USES. It is usually used in scenes with high flow requirement and low pressure requirement. It is mainly composed of fan impeller and casing. Axial flow fan noise operation will also produce noise, this noise is basically a dipole nature, axial flow fan noise control is also very important, the current treatment methods are mainly:
Axial flow fan noise should be how to deal with
In terms of aerodynamic performance, airflow impact and boundary layer separation should be minimized so as to avoid or reduce impact noise and eddy current noise. Sharp protrusion and sharp turning of the flow part should be avoided in design.
2. According to the principle of sound impedance mismatch, the muffler is designed and installed at the inlet and outlet of the axial flow fan to minimize the sound radiation noise of the inlet and outlet of the axial flow fan, which can effectively reduce the noise.
3. Sound absorption plate is set at the outlet of axial flow fan pipe, which can effectively reduce the noise level.
Recently, in order to prevent or reduce the noise propagation of axial flow fan, the axial flow fan is placed in the sound insulation room with sound absorption performance.
5, to transform the blade, is one of the most common blade perforation method, this method can reduce the vortex noise, make the air resistance can be a very good in the past, usually the wheel blade perforation method, often appear because of blade outlet vortex separation, the perforation method, can make the part of the air flow through the high voltage side to low voltage side blade blade, can make leaf blade flow separation point to move down, so that reduces the blade exit section of the separation zone, reduce the noise effect is more obvious.
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