Abstract
A new type of low-noise centrifugal fan with a special cut-off attenuator with a perforated plate has been invented and designed. The principle of noise suppression with this cut-off attenuator and its structure characteristics is introduced in this paper. A series of experimental comparisons of this type of centrifugal fan with a prototype centrifugal fan have been carried out. The experimental results show that the A-weighted noise level of a prototype fan without a cut-off attenuator with a perforated plate is 93 dB. As a result of using this special attenuator, the noise level of a centrifugal fan is decreased to 88.3 dB. Thus, sound attenuation due to this attenuator is 4.7 dB. In addition, decreasing the airflow and keeping the rotating velocity of the fan unchangeable, noise reduction would be 3.5 to 5.0 dB. It can be shown from the spectrum measurements that by using this cut-off attenuator with a perforated plate, not only the discrete frequency noise components of blade passing frequency and its harmonics, which predominate the sound level of a centrigual fan, can be attenuated, but also the broadband noise can be suppressed. Meanwhile, the aerodynamic performance of a centrifugal fan has not been greatly changed. [Work suported by NSFC.]
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