Numerical simulation and experiment for study on internal flow pattern of vortex pump

Quan, Hui; Chai, Yi; Li, Rennian; Guo, Jianhui

doi:10.1108/ec-09-2018-0420

Cited by 11 publications

(7 citation statements)

References 16 publications

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“…e external characteristic curve can almost provide all the necessary indexes of the pump [29,30]. When the flow rate is from the 0.4 Q 0 to 1.6 Q 0 flow point measured by the experiment, the head H and efficiency η performance curve change trend of the Roto-Jet pump is shown in Figure 13.…”

Section: Performance Of Roto-jet Pumpmentioning

confidence: 94%

Coupling Mechanism of Rotating Casing Effect and Impeller Structure of Roto-Jet Pump

Huang

Liu

Wang³

et al. 2020

Shock and Vibration

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An increase in internal pressure of a Roto-Jet pump is due to combined action of its impeller and rotating casing. Internal pressure of the pump chamber was determined according to outlet pressure of the impeller, and the influence of the rotary casing effect was ignored. To study the combined action mechanism of the rotating casing effect and impeller structure on the Roto-Jet pump, we used the open test bed of the Roto-Jet pump and four model pumps with impellers of different structures as research objects. We also conducted a comprehensive experimental study on the coupling mechanism between the rotating casing effect and impeller structure. Numerical calculation was performed to avoid the assumption of isotropic eddy viscosity, Reynolds stress linear pressure-strain model is selected, and the numerical calculation results are compared with the experimental results to verify its credibility. The results show that the rotating casing effect has multiple functions to reduce the friction loss of the disc, improve the pressure distribution inside the rotating casing, and increase the pump head. All scheme, pressure, and velocity fluctuations occur in the upstream and wake regions of the collecting pipe and the energy loss is concentrated in the upstream region. The difference in velocity distribution inside the collecting pipe is small and negligible. As long as the impeller and rotating casing continue to rotate synchronously, the liquid shear velocity at the same coordinate position of each scheme remains unchanged, and the liquid rotation angular velocity in the rotating casing is approximately 75% of the rotating casing which conforms to the rigid motion law. In the same scheme, the coefficient of uneven velocity inside the rotating casing gradually increases along the radial direction. The closer to the axis, the faster is the decrease of the peak tangential velocity and the velocity tends to be uniform. The size, shape, and position of the vortex core inside the rotating casing change constantly with various schemes. The distribution of vortex cores varies under each scheme. The front cover and rotating casing have a serious effect on the vortex core. The extremely poor analysis of the test results shows that the performance of the Roto-Jet pump is better when the closed impeller is rotated in synchronisation with the rotating casing. The advantages and disadvantages of each blade type can be determined according to the situation. The research results can exhibit the influence mechanism of the Roto-Jet pump shell effect. Selection of an impeller structure provides a reference.

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Section: Performance Of Roto-jet Pumpmentioning

confidence: 94%

Coupling Mechanism of Rotating Casing Effect and Impeller Structure of Roto-Jet Pump

Huang

Liu

Wang³

et al. 2020

Shock and Vibration

Self Cite

View full text Add to dashboard Cite

show abstract

“…Compared with the standard k - ε model, the RNG k - ε model considers the influence of vortices on turbulent flow, improves the calculation accuracy of vortex flow, adapts better to the flow with high strain rate and large degree of streamline curvature and is widely used in the calculation of the internal flow of a vortex pump (Ni et al. , 2021; Quan et al. , 2019; Sha, 2011).…”

Section: Methodsmentioning

confidence: 99%

“…The Re-Normalisation Group (RNG) k-ε turbulence model was used for numerical calculations in this study. Compared with the standard k-ε model, the RNG k-ε model considers the influence of vortices on turbulent flow, improves the calculation accuracy of vortex flow, adapts better to the flow with high strain rate and large degree of streamline curvature and is widely used in the calculation of the internal flow of a vortex pump (Ni et al, 2021;Quan et al, 2019;Sha, 2011). The convection terms are discretized in high-resolution format, which combines the advantages of upwind and central differencing for more stable calculations.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Effect of impeller installation position on unsteady flow characteristics of a vortex pump

Zhao

Tan²,

Wu³

et al. 2023

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PurposeThe purpose of the paper is to disclose the effect of the relative position (d) between the impeller and non-vane cavity on the hydraulic performance and unsteady characteristics of vortex pump.Design/methodology/approachThree groups of vortex pump models with different impeller installation positions were analyzed and studied by combining experimental and CFD (Computational Fluid Dynamics) numerical calculations.FindingsThe steady numerical results show that as the width (d) of the impeller moves into the non-vane cavity increases, the proportion of circulation flow in the non-vane cavity is reduced and both the pump head and efficiency are on the rise. The unsteady numerical results and the Enstrophy analysis show that the dynamic and static interference between the circulation flow and the volute tongue is the main reason for the pressure pulsation with a frequency of 2fn in the vortex pump. With the increase of the d value, the dynamic and static interference between the circulation flow and the volute tongue is enhanced. The pulsation amplitude at the volute tongue of the d = 16.5 mm model increases about six times compared with the d = 0 mm model; the distribution of the vortex core in the non-vane cavity is closely related to the position of the impeller, and the peak of the Enstrophy of the circulation flow vortex belt always appears at the top of the impeller.Originality/valueThe research results provide a theoretical foundation for the optimization and improvement of the vortex pump.

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“…In order to improve convergence, the SIMPLEC algorithm is used to solve the governing equations with the second order upwind discretization in momentum, turbulence dissipation rate and turbulence kinetic energy terms (Quan et al 2019).…”

Section: Boundary Conditions and Simulation Proceduresmentioning

confidence: 99%

Erosion Wear on Impeller of Double-Suction Centrifugal Pump due to Sediment Flow

Shen¹,

Li²,

Wan-jin³

et al. 2020

JAFM

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Erosion wear of the centrifugal pump impeller are the key issues since its operating in sediment-laden flow. Experiment and numerical method are adopted in this study to investigate the erosion wear of the impeller in a double-suction pump in the Jingtai Yellow River Irrigation Project (JYRIP). Observation during operation combined with morphology study is carried out to verify erosion mechanisms at the different sections of the impeller blade. For numerical study, the Eulerian-Lagrangian approach combined with the Mclaury model is employed to predict the trajectories of the particles under different particle parameters. Also the effects of particle size and concentration on impeller erosion wear is studied. Numerical results are consistent with experimental data. The surface wear of the blade changes obviously from circular shape to strip shape in the direction from the Leading Edge (LE) to the Trailing Edge (TE), and the wear damage area increases correspondingly. Trajectories of larger particles are more uniform and tend to cause more severe erosion wear damage. The wear damage tends to be slow after the particle size increases to a certain extent under the same sediment concentration. Besides, erosion rate increases with an increase in sediment concentration, and the erosion rate of the suction side is greater than the pressure side at the same position of the blade surface. These results can offer a good reference for the design of wear resistance impeller of the double suction pump.

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Numerical simulation and experiment for study on internal flow pattern of vortex pump

Cited by 11 publications

References 16 publications

Coupling Mechanism of Rotating Casing Effect and Impeller Structure of Roto-Jet Pump

Coupling Mechanism of Rotating Casing Effect and Impeller Structure of Roto-Jet Pump

Effect of impeller installation position on unsteady flow characteristics of a vortex pump

Erosion Wear on Impeller of Double-Suction Centrifugal Pump due to Sediment Flow

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