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Cong Wang,Yongxue Zhang,Hucan Hou,Zhiyi Yuan,Ming Liu 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.1
To improve the energy conversion efficiency and cavitation performance of the ultra-low specific-speed centrifugal pump (ULSSCP), the impeller-volute interaction has been studied. Blade outlet setting angle (β₂), wrap angle (φ), volute inlet width (b₃) and throat area (St) were addressed as the design parameters. The entropy production at 0.5 Q0 and NPSHc (critical net positive suction head) at 1.5 Q0 were selected as the target to characterize the energy loss and cavitation performance. The L9 (3⁴) orthogonal matrix was established via Taguchi method. Results show that the contribution ratio of φ on S/NS is the most vital, followed by b₃ and St, while the influence of β₂ is relatively small, and the design parameter combination with β₂=19°, φ=220°, b₃=12mm and St=190㎟ is the best choice for the lowest entropy production at 0.5Q0 and NPSHc. At last, the optimization design reduces the loss greatly before and after cavitation by alleviation of vortex generation and backflow intensity.