Influence of Forward Skew Blade Angle on Positive Slope Characteristics of Mixed Flow Pumps

Ikuta, Akihiro; Nitta, Naruki; Miyagawa, Kazuyoshi; Shinozuka, Yasushi; Tomimatsu, Shigeyuki

doi:10.1088/1742-6596/1909/1/012076

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Ji et al [4] analyzed the effect of the blade thickness on the rotating stall of a mixed flow pump using the entropy generation method. Ikuta et al [5] found that the forward skew blade angle has an obvious effect on positive slope characteristics of the mixed flow pumps. The positive slope region can be moved to a smaller flow rate by increasing the skew blade angle.…”

Section: Introductionmentioning

confidence: 99%

Optimization Design of Energy-Saving Mixed Flow Pump Based on MIGA-RBF Algorithm

Yuan

Wei

et al. 2021

Machines

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Mixed flow pumps driven by hydraulic motors have been widely used in drainage in recent years, especially in emergency pump trucks. Limited by the power of the truck engine, its operating efficiency is one of the key factors affecting the rescue task. In this study, an automated optimization platform was developed to improve the operating efficiency of the mixed flow pump. A three-dimensional hydraulic design, meshing, and computational fluid dynamics (CFD) were executed repeatedly by the main program. The objective function is to maximize hydraulic efficiency under design conditions. Both meridional shape and blade profiles of the impeller and diffuser were optimized at the same time. Based on the CFD results obtained by Optimal Latin Hypercube (OLH) sampling, surrogate models of the head and hydraulic efficiency were built using the Radial Basis Function (RBF) neural network. Finally, the optimal solution was obtained by the Multi- Island Genetic Algorithm (MIGA). The local energy loss was further compared with the baseline scheme using the entropy generation method. Through the regression analysis, it was found that the blade angles have the most significant influence on pump efficiency. The CFD results show that the hydraulic efficiency under design conditions increased by 5.1%. After optimization, the incidence loss and flow separation inside the pump are obviously improved. Additionally, the overall turbulent eddy dissipation and entropy generation were significantly reduced. The experimental results validate that the maximum pump efficiency increased by 4.3%. The optimization platform proposed in this study will facilitate the development of intelligent optimization of pumps.

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Section: Introductionmentioning

confidence: 99%

Optimization Design of Energy-Saving Mixed Flow Pump Based on MIGA-RBF Algorithm

Yuan

Wei

et al. 2021

Machines

View full text Add to dashboard Cite

show abstract

Investigation on the hump region generation mechanism of pump mode in low-head pumped hydro-storage unit

Zhao

Wang

et al. 2022

Physics of Fluids

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The pump mode of the low-head pumped hydro storage unit (pump-turbine) may operate in the hump region under extreme conditions due to the influence of water level variation, and the resulting energy conversion instability will seriously threaten the safety of the unit. However, the generation mechanism of the hump region is still not sufficiently understood, which is mainly due to two reasons: the dominant unstable flow structures that induce the formation of the hump region have not been uniformly recognized, and the influence of the dominant unstable flow structures on the impeller's working capacity has not been effectively revealed. In this study, experiments and numerical simulations were carried out on the low-head pumped hydro storage unit in pump mode, and the following results were obtained. It is found that the dominant unstable flow structures that induce the formation of the hump region are the leading edge backflow on the blade inlet shroud side and the horn-like vortex on the blade outlet hub side. The leading edge backflow reduces the blade loading and limits the impeller's working capacity, and the horn-like vortex increases the blade loading and increases the impeller's working capacity. The analysis revealed that the formation of the hump region is the result of the mutual restriction of the horn-like vortex and the leading edge backflow.

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Influence of Forward Skew Blade Angle on Positive Slope Characteristics of Mixed Flow Pumps

Cited by 2 publications

References 3 publications

Optimization Design of Energy-Saving Mixed Flow Pump Based on MIGA-RBF Algorithm

Optimization Design of Energy-Saving Mixed Flow Pump Based on MIGA-RBF Algorithm

Investigation on the hump region generation mechanism of pump mode in low-head pumped hydro-storage unit

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