Abstract
In order to discuss the influence of hub ratio on aerodynamic noise of a radiator fan, the simulation for radiator fan is conducted and the base model is also established in the text. The hub ratios that are 0.4, 0.45, 0.5 respectively are selected combining with the aerodynamic noise formula, And the figure of the relationship between hub radio and aerodynamic noise, and the changes of the flow and shaft power are confirmed by analyzing the three cases. It is determined that the level of aerodynamic noise can be lower with the increase of the hub ratio, and the noise reduction can be achieved by increasing the hub ratio.
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