The impeller is a crucial energy-converting component in a centrifugal pump, significantly impacting performance and energy conservation. The impeller blade design crucially influences efficacy and flow behavior. The Taguchi technique is implemented to optimize the impeller blade design to maximize the pump efficiency and minimize energy loss. A design of experiment with L16 orthogonal designation is generated, where there are four factors: blade exit angle (β2), blade wrap angle (φ), blade number (Z), and the shape of the blade's trailing edge (TE) and each factor has four levels. An integrated factor is employed to accomplish the multi-objective optimization of both efficiency and total entropy generation (TEG), considering the weight of the two objectives. Numerical analyses are performed to investigate a centrifugal pump's transient flow behavior, employing the turbulence model of shear stress transport (SST) k–ω. The findings indicate that head and efficiency at the design conditions improved by 2.26% and 5.39%, respectively, whereas TEG decreased by 17.05%. The improved design exhibited decreased energy loss and enhanced stability in the flow at the rotor–stator interaction zone. The current optimization study significantly improves pump efficiency, reduces energy loss, and enhances flow stability, benefiting energy conservation in pump operations.
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