engleski

3D shape optimization of fan vanes for multiple operating regimes subject to efficiency and noise related excellence criteria and constraints

Fully generic 3D shape of centrifugal roof fan vanes is explored based on a custom-developed numerical workflow with ability to vary the vane 3D shape by manipulating the control points of parametric surfaces and to change the number of vanes and rotation speed. Excellence formulation is based on design flow efficiency, multi-regime operational conditions and noise criteria for various cases including multi-objective optimization. Multiple cases of optimization demonstrate ability of customized and individualized fan design for the specific working environment according to the selected excellence criteria. Noise analysis is considered as an additional decision making tool for cases where multiple solutions of equal efficiency are generated and as an additional criteria for multi-objective optimization. The 3D vane shape enables for further gains in efficiency compared to 2D shape optimization while multi-objective optimization with noise as additional criteria shows potential to greatly reduce the roof fan noise with only small losses in efficiency. The developed workflow which comprises (i) 3D parametric shape modeller, (ii) an evolutionary optimizer and (iii) CFD simulator can be viewed as an integral tool for roof fan optimum design for custom-specified conditions.

parametric 3D shape optimization; centrifugal fan; CFD; multi-regime; multi-criteria

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