Shape optimization of forward-curved-blade centrifugal fan with Navier-Stokes analysis

The response surface method using a three-dimensional Navier-Stokes analysis to optimize the shape of forward-curved-blade centrifugal fan is described. For the numerical analysis, Reynolds-averaged Navier-Stokes equations with the standard κ-e turbulence model are discretized with finite volume approximations. The SIMPLEC algorithm is used as a velocity-pressure correction procedure. In order to reduce the huge computing time due to a large number of blades in forward-curved-blade centrifugal fan, the flow inside of the fan is regarded as steady flow by introducing the impeller force models. Four design variables, i.e., location of cutoff, radius of cutoff, expansion angle of scroll, and width of impeller were selected to optimize the shapes of scroll and blades. Data points for response evaluations were selected by D-optimal design, and a linear programming method was used for the optimization on the response surface

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