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Noise Source of Axial Fans
source:Industry News release time:2021-01-21 Article author:Rosit Popular:Air band saw
According to analysis, the noise source of axial fans is basically dipole in nature. Noise is caused by the impulse force of the blade acting on the air flowing through the fan.
There are two discrete frequency noise sources of the fan, one is the propeller-like noise caused by the pressure field of the rotor blade movement, and the other is the blade pulsation noise caused by aerodynamic interference. The distance between wind maneuver and stationary blade is an important factor of interference noise.
When the distance is small, changes in the potential flow and wake will have an impact.The blade may also act as a sound barrier to strengthen the sound radiation generated by the lift pulse on the blade adjacent to the blade row.
The effect depends on the ratio of the wavelength of the sound wave related to lift pulsation to the size of the blade as a barrier. In the frequency range where the ratio is greater than 2, the change in radiation intensity due to this effect is significant.
Therefore, when the upstream and downstream of a noise-radiating blade have the same number of blades, and each blade in the two rows of blades meets a rotor blade at the same time and constitutes a sound barrier on both sides of the source, the effect will be stronger.
Rosit is a leader in the global power tool service market. We take electric, pneumatic and hydraulic drive technology as the core. Our product categories mainly include hand tools, instruments, workshop equipment and fixed tools, labor protection products, industrial equipment,chemicals and so on.
At the same time, we provide customers with a series of system solutions and communication channels to help customers improve procurement, inventory, logistics and management costs.
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