Modeling and Optimization of Multiphase Flow in Pump Station

Sedlář, Milan; Machalka, J; Komárek, Martin

doi:10.1088/1742-6596/1584/1/012070

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…The reason of using the simplified laboratory model is that the application of the advanced experimental techniques based on the optical principle is not possible in the real situation. In reality, the geometry of the discharge object can be more complicated [4], the size is bigger and the vessel walls are not suitable for the optical measurements (they are typically made of concrete). Nevertheless the flow phenomena investigated in the study depict the complex flow behavior enough to validate reliably the CFD tools used by authors.…”

Section: Discussionmentioning

confidence: 99%

“…The dominant structure here is the nodal point of attachment. It can be seen, that this As mentioned above, the transient phenomena during the start-up phase of the pumping station as well as the experimental discharge object with the welded siphons have been studied numerically in [4] using the SAS and DES scale resolving simulations. Though the DES simulations provided better resolution of vortical structures, the SAS simulations showed much better robustness and better predictions of frequencies of unsteady phenomena.…”

Section: Piv Experimentsmentioning

confidence: 99%

“…A more advanced study can be found in [3], which aims to predict transient phenomena during the stopping process in the axial-flow pump system with the siphon outlet using the VOF model inside the fluent CFD code. The transient phenomena during the start-up phase of the complete pumping station with the welded siphon outlet have been studied numerically in [4] using the scale-adaptive simulations (hereinafter SAS) and the detached eddy simulations (hereinafter DES), supported by some experimental visualizations. There, also the discharge objects with the arrow-shaped overflow wall have been analyzed experimentally as well as using CFD.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Research and Numerical Analysis of Flow Phenomena in Discharge Object with Siphon

Sedlář¹,

Procházka

Komárek³

et al. 2020

Water

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This article presents results of the experimental research and numerical simulations of the flow in a pumping system’s discharge object with the welded siphon. The laboratory simplified model was used in the study. Two stationary flow regimes characterized by different volume flow rates and water level heights have been chosen. The study concentrates mainly on the regions below and behind the siphon outlet. The mathematical modelling using advanced turbulence models has been performed. The free-surface flow has been carried out by means of the volume-of-fluid method. The experimental results obtained by the particle image velocimetry method have been used for the mathematical model validation. The evolution and interactions of main flow structures are analyzed using visualizations and the spectral analysis. The presented results show a good agreement of the measured and calculated complex flow topology and give a deep insight into the flow structures below and behind the siphon outlet. The presented methodology and results can increase the applicability and reliability of the numerical tools used for the design of the pump and turbine stations and their optimization with respect to the efficiency, lifetime and environmental demands.

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Section: Discussionmentioning

confidence: 99%

Section: Piv Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Research and Numerical Analysis of Flow Phenomena in Discharge Object with Siphon

Sedlář¹,

Procházka

Komárek³

et al. 2020

Water

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“…Interesting results can be found, e.g., in [12][13][14][15], considering the broad-crested and sharp-crested weirs with a 2D geometry, or [13] considering the side weir. The modeling of a complete pump station with a V-shaped broad-crested weir can be found in [16]. Compared to the overflow walls, siphons offer a possibly higher hydraulic efficiency, but a siphon-breaking valve is required to prevent back-flow and allow for venting at start-up.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on the Performance of a Pumping Station with Bell-Mouth-Based Vertical Pumps during an Accidental Shutdown

Sedlář,

Abrahámek

2024

Processes

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This study presents a numerical simulation of a pump’s performance during a power-cut event and connected hazards resulting from the failure of non-return flap valves. The vertical mixed-flow pumps with suction bells were mounted inside the suction basins of a pumping station. Different regimes of the pump operation during the time were analyzed based on the pump’s 4-quadrant characteristics and the dynamics of rotating parts in the pump, gearbox and electric engine. The resulting development of flow rates, rotor speed and forces in the course of time were used to analyze the hazards of failure of any pumping system component and the flooding of the suction object and its surroundings. The presented results show a deep insight into the flow phenomena in vertical mixed-flow pumps with suction bells during the runaway process and confirm that the developed methodology can be successfully applied to monitor the critical regimes in a pumping station in real time. The simulations were verified with some experimentally obtained data.

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Numerical Analysis of Flow Phenomena in Discharge Object with Siphon Using Lattice Boltzmann Method and CFD

Fürst

Halada

Sedlář³

et al. 2021

Mathematics

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This article presents numerical simulation of flow in the discharge object with the welded siphon and the free water level. The main numerical tool used in this study is the lattice Boltzmann method combined with the Volume-of-Fluid approach and the Smagorinski LES model. Some aspects of the numerical method are discussed, especially the formulation of the outlet boundary condition. The simulations are carried out with in-house software based on the open-source Palabos framework. Presented results are compared with the CFD simulations, based on the ANSYS CFX software applying the SST and SAS turbulence models and the free-surface flow modeling by means of the Volume-of-Fluid method. The evolution and interactions of main flow structures are analyzed using visualizations and the spectral analysis. All numerical simulations are verified by the experimental data obtained in the hydraulic laboratory with water circuit. A stationary flow regime has been visualized by means of PIV. Both the vertical planes and horizontal planes have been examined, focused mainly on the regions below and behind the siphon outlet. The results show a good agreement of calculated and measured complex flow structures, including time-averaged and instantaneous flow fields.

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Modeling and Optimization of Multiphase Flow in Pump Station

Cited by 3 publications

References 5 publications

Experimental Research and Numerical Analysis of Flow Phenomena in Discharge Object with Siphon

Experimental Research and Numerical Analysis of Flow Phenomena in Discharge Object with Siphon

A Numerical Study on the Performance of a Pumping Station with Bell-Mouth-Based Vertical Pumps during an Accidental Shutdown

Numerical Analysis of Flow Phenomena in Discharge Object with Siphon Using Lattice Boltzmann Method and CFD

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