Axial Fan Noise Reduction

The noise sources on axial fans are usually caused by the fluctuating pressure distribution on the surface of fan blade.

Axial fan noise reduction.

Proposed 100k conventional attenuators for 10 axial mine water evaporation fans in australia would have had zero effect in the noise as it was predominantly low frequency tones hum or drone. Keywords axial fans condenser fans noise control noise reduction tonal noise order reprints in applications relating to refrigeration air conditioning and ventilation technology users frequently notice that the selected fan installed in the device does not run as quietly as expected. 4 fan speed in axial or centrifugal flow fans you can increase noise control simply by changing control systems or pulley sizes and resetting dampers. Most of the sources are near the trailing edge of blades or boundary region of blades.

5 pneumatic exhausts pneumatic exhaust noise can be reduced by up to 30db by fitting silencers. Technique fan noise is roughly proportional to the 5th power of fan speed. Axial or centrifugal flow fans. A few emails and 20k gave 23db noise reduction and improved efficiency.

In this paper a ring silencer design for reducing the noise of axial fans is presented. The design of axial fans typically considers the efficiency but also the reduction of noise. It reduces room to room noise by up to 46db.