Dynamic Characteristics of Centrifugal Fan Impeller Based on Fluid-Solid Coupling

The non pre-stressing and pre-stressing modal analysis for impeller were computed by software ANSYS, and the unsteady flow for centrifugal fan was simulated by software CFX, at the same time the air pressure around the impeller was obtained. The results show that, the pre-stressing effect will improve the values of natural frequencies of impeller, but the increased values of the natural frequencies are different, the main frequency of air pressure fluctuation around the impeller is equal to the blade passing frequency of impeller, and it will not caused the danger of fatigue failure of impeller.