Three-Objective Optimization of a Centrifugal Pump to Reduce Flow Recirculation and Cavitation

[+] Author and Article Information
Hyeon-Seok Shim

Department of Mechanical Engineering, Inha University, 100 Inha-Ro, Nam-Gu, Incheon, 22212, South Korea

Kwang-Yong Kim

Fellow ASME, Department of Mechanical Engineering, Inha University, 100 Inha-Ro, Nam-Gu, Incheon, 22212, South Korea

Young-Seok Choi

Thermal & Fluid System R&BD Group, Korea Institute of Industrial Technology, 89 Yangdaegiro-gil, Seobuk-gu, Cheonan-si, Chungcheongnam-do 331-822, South Korea

1Corresponding author.

ASME doi:10.1115/1.4039511 History: Received October 19, 2017; Revised February 18, 2018


This work presents a three-objective design optimization of a centrifugal pump impeller to avoid flow recirculation and cavitation using three-dimensional Reynolds-averaged Navier-Stokes equations. A cavitation model was used to simulate the multi-phase cavitating flow inside the centrifugal pump. The numerical results were validated by comparing them with experimental data for the total head coefficient and critical cavitation number. To achieve the optimization goals, blockage at 50% of the design flow rate, hydraulic efficiency at the design flow rate, and critical cavitation number for a head-drop of 3% at 125% of the design flow rate, were selected as the objective functions. Based on the results of the elementary effect method, the design variables selected were the axial length of the blade, the control point for the meridional profile of the shroud, the inlet radius of the blade hub, and the incidence angle of tip of the blade. Kriging models were constructed to approximate the objective functions in the design space using the objective function values calculated at the design points selected by Latin hypercube sampling. Pareto-optimal solutions were obtained using a multi-objective genetic algorithm. Six representative Pareto-optimal designs were analysed to evaluate the optimization results. The Pareto-optimal designs showed large improvements in the objective functions compared to the baseline design. Thus, both the hydraulic performance and reliability of the centrifugal pump were improved by the optimization.

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