To reduce the aerodynamic noise of centrifugal fans,a mathematical-physical model was established to analyze the property of the sound-absorption volute of a centrifugal fan,which is composed of a perforated volute plate,an acoustic-absorbing liner,a micro-perforated plate and a cavity.The analysis with this model indicates that the absorbing liner of certain thickness would yield fine effect absorbing aerodynamic noise of about 1-8 kHz.The frequency range with higher coefficient values would be widened tow...