Abstract
The effects of the volute angle on the characteristics of the aerodynamics and noise of a dual-cascades centrifugal fan have been experimentally investigated. The experimental data of dual-cascade centrifugal fan compared to that of the fan was constructed by unique-cascade. Of the fan efficiency of design point, the former is higher than that of the latter by about 6%. In the region of high efficiency at which the efficiency is about maximum fan efficiency, the former is wider than latter. The fan noise at design point is same in the former and the latter. When the volute casing has an volute angle of 6°, the sound pressure level and the specific noise level of the fan are lowest and the fan efficiency is highest. The peak of sound pressure level of the rotating noise was not detected.
