A noise reduction experiment was conducted on a forward swept centrifugal fan with absorption material and cavity in its volute. The influence of different thickness of absorption material and cavity on the noise reduction of the sound-absorption volute at different speed was analyzed. A superimposed noise reduction test of the volute combined with an incline tongue was performed. Experimental results show that the aerodynamic performance of the modified fan is decreased slightly compared with that of the original fan. However
the sound absorption property of the volute is improved with the increase of the thickness of absorption material or cavity in a certain range of the thickness
especially at smaller flow rate or lower speed. The combination of absorption material and cavity in the volute with the incline tongue will lead to superimposed noise reduction.
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references
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