Abstract
In this paper, the blade angle modulation method is used to design the unequal distance fan, and three unequal-distance fans with different blade spacing angles are designed. The aerodynamic noise and aerodynamic performance of three unequal-distance fans are analyzed and studied by CFD simulation method. The results show that with the increase of the uneven distribution of blades, the total A-weighted sound pressure level of the fan and the discrete noise of the fan at the passing frequency decrease significantly. The difference between the main aerodynamic performance parameters of three types of non-equidistant fans and equidistant fans is small, which shows that the unequal distance distribution has little effect on the aerodynamic performance while reducing the noise.
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