Analysis of the Flow Pattern and Flow Rectification Measures of the Side-Intake Forebay in a Multi-Unit Pumping Station

Nasr, Ahmed; Yang, Fan; Zhang, Yiqi; Wang, Tieli; Hassan, M. A.

doi:10.3390/w13152025

Cited by 19 publications

(9 citation statements)

References 34 publications

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“…Vice versa, indicating more drastic changes in the quarter, r¯ is calculated as in equation. 3 where r is the radius of curvature (m); L is the calculated range (m).…”

Section: Evaluation Indicatorsmentioning

confidence: 99%

“…1 Tao et al 2 proposed a case based on flow pattern construction and natural heuristics that can reduce the flow resistance and pressure variation in the inlet passages including pumping systems. Ahmed et al 3 to improve the problem of turbulence in the forebay of the lateral inlet pumping system, based on the computational fluid dynamics method (CFD) technology compares and analyzes the numerical simulation with or without rectification measures for the forebay of the lateral intake pumping system when multiple units are operating. Nourbakhsh 4 and Remo et al 5 proposed optimizations of the centrifugal pump vane optimization problem using a multi-objective particle swarm algorithm and an optimized genetic algorithm, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of low-head shaft tubular pumping systems based on entropy production theory

Wang,

Jiao,

Cheng

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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In order to improve the operation efficiency of low-head tubular pump, this paper studies the influence of shaft type in the shaft tubular pump on the flow characteristics and energy characteristics of the pump. To optimize the shaft structure of shaft tubular pumping systems and realize the efficient use of energy, numerical simulation and model test was employed to study the optimization of the entire pumping system. In this paper, the CFD method was used to numerically simulate the whole pumping system, and the effect of changing the shaft length, shaft head profile, and shaft tail profile on the internal flow and entropy production characteristics of the inlet passage and impeller position were analyzed. It is found that the tapered tail profile can make the inlet passage overflow area change more smoothly and thus make the flow pattern more favorable. The wall entropy production dissipation at the inlet passage position dominates the total entropy production, and the high-value area of mainstream entropy production at this position is distributed periodically. The mainstream entropy production dissipation at the impeller section accounts for a relatively large proportion. After the entropy production dissipation analysis, it is believed that the tapered can reduce the entropy production dissipation of the pumping systems. The change of the shaft tail profile will make the entropy production dissipation change more noticeable compared with other optimization factors. Therefore, the tapered tail profile with better transition in the actual project is recommended.

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“…Vice versa, indicating more drastic changes in the quarter, r¯ is calculated as in equation. 3 where r is the radius of curvature (m); L is the calculated range (m).…”

Section: Evaluation Indicatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of low-head shaft tubular pumping systems based on entropy production theory

Wang,

Jiao,

Cheng

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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show abstract

“…With the improvement in Particle Image Velocimetry (PIV) and Volumetric 3-component Velocimetry (V3V), scholars have also been encouraged to further explore the unsteady flow inside pumps and multiphase turbulent flow fields within intake structures [22][23][24][25][26]. The optimization of the water-sediment flow field inside the inlet structure by rectifying facilities such as diversion piers, diversion walls, bottom sills, columns, and water pressure plates has also been widely studied [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Water–Sediment Flow Fields within the Intake Structure of Pumping Station under Different Hydraulic Conditions

Xu,

Tian,

Wang

et al. 2024

Water

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The vortices, backflow, and siltation caused by sediment-laden flow are detrimental to the safe and efficient operation of pumping stations. To explore the effects of water–sediment two-phase flow on the velocity field, vorticity field, and sediment distribution within intake structures, field tests and numerical simulations were conducted in this study with consideration for the sediment concentration, flow rate, and start-up combination. We applied a non-contact laser scanner and ultrasonic Doppler velocimetry to obtain the field data and reverse modeling of the three-dimensional model of the intake structure under siltation. A multiphase flow model based on the Euler–Euler approach combined with the k-ε turbulence model was adopted for numerical simulation under 10 working conditions, and the reliability was verified with field data. The results indicate that sediment promotes the evolution of coaxial vortices into larger-scale spiral vortices along the water depth, and the process of sediment deposition is controlled by the range, intensity, and flow velocity of the backflow zone. Furthermore, the maximum volume fraction of the near-bottom sediment increased by 202.01% compared to the initial state. The increase in flow rate exacerbates the turbulence of the flow field. Although the increase in sediment concentration benefits the flow diffusion, it further promotes sediment deposition. This study provides a new idea for modeling complex surfaces and considers different operating conditions. It can serve as a scientific reference for the structural optimization and anti-siltation design of similar water-conservancy projects.

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“…Ying et al [21] effectively improved the uniformity of the flow velocity distribution through a combined rectification method using pillars and bottom sills. Nasr Ahmed et al [22] found that parabolic walls and partial diversion piers effectively improved the flow regime within the forebay of laterally inflowing pumping stations and the flow regime within the inlet pool. Zheng et al [23] developed a combined rectification approach comprising bottom sills and diversion piers and revealed that the addition of bottom sills and the installation of diversion piers in the forebay allowed for secondary rectification, dispersing the inflow and producing more evenly distributed flow velocities among various units.…”

Section: Introductionmentioning

confidence: 99%

Influence of Partition Wall Length on Inlet Flow Regime of a Pumping Station Arranged in Parallel with a Sluice Gate

Shi,

Lv,

et al. 2024

Processes

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When a sluice gate is arranged in parallel with pumping station units, biased flow occurs in the forebay when the units are operating. The transverse flow velocity in front of the channel inlet is relatively high, and, in severe cases, it may lead to the formation of suction vortices, impacting the stable operation of pump units. Taking the Liushan Pumping Station project of the Eastern Route of the South-to-North Water Diversion Project as a case study, this paper investigates the effect of the partition wall length on the inlet flow regime of pumping station units arranged in parallel with the sluice gate to reduce the transverse flow velocity in front of the channel inlet. Using numerical simulations, the inlet flow regimes for different partition wall lengths were compared. Moreover, the flow field distributions in the forebay under different operating conditions were analyzed alongside the transverse flow velocity in front of the channel inlet and the uniformity of flow velocity distribution in the section behind the channel inlet. Hydraulic model tests were then conducted to validate the simulation results. The results indicate that in the original design, there existed a vortex zone in the forebay in front of the inlet of the channel where the transverse flow was relatively high. However, the introduction of partition walls significantly reduced the transverse flow velocity in front of the inlet of the channel in the forebay. The optimal effect was achieved when the length of the partition wall was twice the width of the inlet channel. Furthermore, the uniformity of velocity distribution at the inlet of the channel increased by an average of 7.4%, leading to a substantial improvement in the inlet flow regime of the pumping station. The addition of partition walls in the forebay effectively resolved the issues related to the flow regime in the forebay, providing valuable references for similar engineering studies in the future.

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Analysis of the Flow Pattern and Flow Rectification Measures of the Side-Intake Forebay in a Multi-Unit Pumping Station

Cited by 19 publications

References 34 publications

Optimization of low-head shaft tubular pumping systems based on entropy production theory

Optimization of low-head shaft tubular pumping systems based on entropy production theory

Numerical Analysis of Water–Sediment Flow Fields within the Intake Structure of Pumping Station under Different Hydraulic Conditions

Influence of Partition Wall Length on Inlet Flow Regime of a Pumping Station Arranged in Parallel with a Sluice Gate

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