Abstract
The inlet geometry of the centrifugal fan has been numerically optimized to maximize the fan performance and to minimize the fan noise. For the optimization, a representative sub-model using the periodic boundary condition in the circumferential direction was constructed. The radii of the bell-mouth and the shroud at the inlet of the fan were selected as design variables. The objective functions were the fan efficiency for the fan performance and the turbulent viscosity for the noise metric. The moving reference frame (MRF) formulation was adopted for the flow analysis. The case studies were conducted and the results were analyzed using the response surface method. The optimal shapes for the maximum efficiency, minimum noise, and the combined performance were examined with the actual fan model with casing geometry. Details of the optimization process, the effects of design variables and the final optimization results were summarized in quantitative and qualitative ways.
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