Dynamic mode decomposition and reconstruction of tip leakage vortex in a mixed flow pump as turbine at pump mode

Han, Yadong; Tan, Lei

doi:10.1016/j.renene.2020.03.142

Cited by 152 publications

(65 citation statements)

References 33 publications

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“…1 Pump is one of the most suitable equipment for pumped storage power station and small hydropower station due to its low cost, high efficiency and high flexibility. 2 The improvement of the centrifugal pump efficiency as well as the operation stability is of great significance. However, the hydraulic performance and acoustic performance of traditional centrifugal pump are considered separately.…”

Section: Introductionmentioning

confidence: 99%

Collaborative improvement of efficiency and noise of bionic vane centrifugal pump based on multi-objective optimization

Liu

Cheng

et al. 2021

Advances in Mechanical Engineering

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The hydraulic and acoustic performance of centrifugal pump is closely related to hydraulic structure parameters, and they are contradictory. In order to solve this contradiction, this paper introduces the pit bionic structure, and proposes an optimization method based on multi-objective test design and response surface to improve the hydraulic and acoustic performance. Taking the bionic vane pit diameter, axial spacing and radial spacing as design variables. Taking the maximum hydraulic efficiency and total sound pressure level reduction of centrifugal pump as the corresponding objectives. The multiple regression response surface model was constructed to determine the optimal parameter combination of hydraulic performance and noise collaborative optimization. The optimization results were verified by numerical simulation and experimental test. The results show that the response surface multi-objective optimization method has high prediction accuracy, has obvious synergistic effect on the hydraulic and acoustic performance. The highest point of the efficiency curve after optimization is shifted to the direction of large flow, which widens the high efficiency working area of centrifugal pump. Under the rated condition, the hydraulic efficiency is increased by 3.03%, the efficiency increase rate is 4.21%, the total sound pressure level is reduced by 4.96 dB, and the noise reduction rate is 3.01%.

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Section: Introductionmentioning

confidence: 99%

Collaborative improvement of efficiency and noise of bionic vane centrifugal pump based on multi-objective optimization

Liu

Cheng

et al. 2021

Advances in Mechanical Engineering

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“…Liu et al [9] investigated the tip leakage vortex evolution mechanism and associated unsteady flow characteristics of a mixed flow pump under the design flow rate and proposed a theoretical prediction model of the primary tip leakage vortex trajectory. Han et al [10] used ANSYS CFX to investigate the complicated structure of tip leakage vortex in an evolution period for a mixed flow pump as turbine at pump mode, obtained its dynamic and kinematic characteristics. Liu et al [11] established the theoretical model of energy performance prediction for centrifugal pump as turbine under pump and turbine modes based on detailed analysis of losses and proposed a flowrate-based iteration method to determine the best efficiency point under turbine mode.…”

Section: Introductionmentioning

confidence: 99%

A Mathematical Model of the Hydrodynamic Pressure Acting on a Turbine Runner Blade under the Rotor-Stator Interaction Based on the Quasi-Three-Dimensional Finite Element Method

Wang

et al. 2021

Mathematical Problems in Engineering

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In this paper, a turbine runner blade under hydraulic excitation was taken as the object of study and the mathematical hydrodynamic pressure model of a turbine runner blade under the rotor-stator interaction was established using quasi-three-dimensional finite element model. The regularity of the distribution of the hydrodynamic pressure was then investigated. First, the quasi-three-dimensional finite element model of a runner blade was established using the quasi-three-dimensional theory. Next, according to the pressure distribution from the numerical simulation, the mathematical mean pressure model of a node was established using the relative pressure difference method; the pressure fluctuation was then established taking the rotor-stator interaction into consideration. Then, based on the mean pressure and the pressure fluctuation of a node, the mathematical hydrodynamic pressure model for any position of a runner blade was obtained. Finally, the feasibility of the mathematical model was verified by an example analysis, and the internal relationship between the hydrodynamic pressure and its hydraulic parameters and the structural parameters of the blade was revealed, which provides a theoretical basis for further study of the dynamic characteristics of turbine runner blades under the rotor-stator interaction.

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“…However, through research results and production practice at home and abroad, it is found that the flow rate, head and power at the best efficiency point of a pump operating under turbine conditions are all greater than their values under pump conditions. [7][8][9][10][11][12] Therefore, the structural stress of PAT in the vicinity of the optimal operating conditions and in the operation of large flow conditions must also be considered as a key factor. In order to ensure the efficient and safe operation of PAT blade, the design and optimization of the blade must take into account both its hydraulic performance and structural performance.…”

Section: Introductionmentioning

confidence: 99%

Optimal design of blade in pump as turbine based on multidisciplinary feasible method

Miao

Hong-Biao

Wang³

et al. 2020

Science Progress

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In order to make the pump as turbine (PAT) run efficiently and safely, a multidisciplinary optimization design method for PAT blade, which gives consideration to both the hydraulic and intensity performances, is proposed based on multidisciplinary feasibility (MDF) optimization strategy. This method includes blade parametric design, Latin Hypercube Sampling (LHS) experimental design, CFD technology, FEA technology, GA-BP neural network and NSGA-II algorithm. Specifically, a parameterized PAT blade with cubic non-uniform B-spline curve is adopted, and the control point of blade geometry is taken as the design variable. The LHS experimental design method obtains the sample points of training GA-BP neural network in the design space of variables. The hydraulic performance of each sample point (including the hydraulic pressure load on the blade surface) and the strength performance analysis of blades are completed by CFD and FEA technology respectively. In order to save calculation time of the whole optimization design, the multi-disciplinary performance analysis of each sample in the optimization process is completed by single-coupling method. Then, GA-BP neural network is trained. Finally, the multi-disciplinary optimization design problem of PAT blade is solved by the optimization technology combining GA-BP neural network and NSGA-II algorithm. Based on this optimization method, the PAT blade is optimized and improved. The efficiency of the optimized PAT is improved by 1.71% and the maximum static stress on the blade is reduced by 7.98%, which shows that this method is feasible.

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Dynamic mode decomposition and reconstruction of tip leakage vortex in a mixed flow pump as turbine at pump mode

Cited by 152 publications

References 33 publications

Collaborative improvement of efficiency and noise of bionic vane centrifugal pump based on multi-objective optimization

Collaborative improvement of efficiency and noise of bionic vane centrifugal pump based on multi-objective optimization

A Mathematical Model of the Hydrodynamic Pressure Acting on a Turbine Runner Blade under the Rotor-Stator Interaction Based on the Quasi-Three-Dimensional Finite Element Method

Optimal design of blade in pump as turbine based on multidisciplinary feasible method

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