Study on the Vortex in a Pump Sump and Its Influence on the Pump Unit

Song, Xijie; Liu, Chao; Wang, Zhengwei

doi:10.3390/jmse10010103

Cited by 5 publications

(3 citation statements)

References 34 publications

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“…After the sump test was stable, showing periodic behavior, subsurface vortex formation of Type 2 was determined by comparing the time series dye test results with the post-processed vorticity results in PIV, as shown in Figure 5. Vortex formation is periodic in most sump test studies [15,24,25], whereas the observed subsurface vortex of Type 2 in this study followed a periodic pattern with a 2.56 s time period. The period pattern includes the appearance, maintenance and disappearance of the Type 2 subsurface vortices, whereas there is a period of absence of the subsurface vortices before they appear again.…”

Section: Dye Test and Piv Post-processmentioning

confidence: 50%

A Study Comparing the Subsurface Vortex Characteristics in Pump Sumps

Kim

Kim²,

Kim³

et al. 2022

Energies

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The vortex generated around the suction region of the pump sump causes problems such as damage to the pump, increased maintenance costs, and failure to supply coolant smoothly. Therefore, analyzing vortices is essential in pump sump design. However, the CFD analysis alone is insufficient in pump sumps vortex analysis since the reliability of the results is doubtful in scaled model tests. This study conducted the model test to validate a suitable CFD simulation method by identifying the Type 2 vortex among the three types of subsurface vortices. The dye test and PIV technology were used to visualize the Type 2 subsurface vortices, whereas the PIV vorticity results were then compared to the CFD results. The average vorticity of 60.2 (1/s) was identified as the reference level of Type 2 subsurface vortices formation by mapping the dye test results with the PIV vorticity results. Furthermore, the average vorticities of 84.63 (1/s) and 85.15 (1/s) were recorded in the presence of Type 2 subsurface vortices in PIV and CFD, respectively, and these values can be applied to the designing of pump sumps.

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Section: Dye Test and Piv Post-processmentioning

confidence: 50%

A Study Comparing the Subsurface Vortex Characteristics in Pump Sumps

Kim

Kim²,

Kim³

et al. 2022

Energies

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“…In recent years, the axial flow pump in water jet propulsion systems and coastal pump stations has gradually played an increasingly important role [1][2][3]. At present, coastal pump stations basically use a large axial flow pump system (LAPS).…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study on the Shutdown Transition Process of a Large Axial Flow Pump System Focusing on the Influence of Gate Control

Zhang

Tang

et al. 2023

JMSE

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Large axial flow pump systems (LAPS) are widely used in coastal pump stations. In the actual operation of a LAPS, various accidents often occur during shutdown due to the unreasonable control of stop flow measures such as the gate. In this paper, based on the secondary development of Flowmaster numerical software, a numerical simulation study was conducted on the shutdown process of a LAPS with different gate control laws. It was found that the MBV of the shutdown process was greater if the gate was closed more slowly after the unit was powered off. When a 30 s shutdown scheme was used, the MBV during shutdown was 1.63Qr. When a 60s long shutdown scheme was used, the MBV during shutdown was 1.67Qr, an increase of 2.45%. When the 150s long shutdown scheme was used, the MVV during the stopping process reached 1.68Qr, which is an increase of 3.07%. The shutdown method of closing the gate in advance can significantly improve the violent fluctuations of the KCPs of a LAPS during the shutdown transition and will effectively reduce the backflow and the reverse speed of the pump during the shutdown process. Taking the total gate closing time of 120 s as an example, when the 25% gate was closed in advance, the MBV and MRS during the shutdown process were reduced by 14.31% and 1.93%. When the shutdown scenario of preclosing 100% of the gates was adopted, the MBV and MRS during shutdown were reduced by 96.31% and 100%.

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“…Previous intake structure CFD analysis primarily focused on pump-sump design optimization [25], investigation of internal flow patterns [26], streamline flow [27], and what measures should be taken to reduce vortex and swirl flow [28], and effect comparison between different measures and their combinations [29], but only a few of them were related to the prediction of pump flow patterns and the calculation of hydraulic loss of the sump at different intake water levels at the free surface. There were a lot of numerical models on outflow structures, but it was uncommon to look at the efficiency of the pumping system by calculating hydraulic loss and combining it with pump performance.…”

mentioning

confidence: 99%

Hydraulic Performance of Seawater Intake System Using CFD Modeling

Yamini

Movahedi

Mousavi

et al. 2022

JMSE

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In recent years, tapping the sea for potable water has gained prominence as a potential source of water. Since seawater intake systems are often used in the infrastructure industry, ensuring proper efficiency in different operating conditions is very important. In this paper, CFD modeling is used to show general hydraulic design (flow patterns, stream flow, vortex severities, and pre-swirl) principles and performance acceptability criteria for pump intakes in different conditions. The authors explore scenarios for avoiding or resolving hydraulic problems that have arisen as a result of hydraulic model studies. The results show that the designer should make every effort to avoid small entrance and filtration areas from the basin to the intake forebay bottom, which could result in jet outlet and/or supercritical flow; too small logs at the basin outflow, which could result in high velocity flow jets; and sudden area contractions at the forebay to pump bay junction. There should be enough submergence at the pumps to reduce harmful vortex severities and pre-swirl. Curtain walls, baffles, fillets, and splitters, as well as flow redistributors, can all aid in improving approach flow patterns. Reduced flow separations and eddies will be greatly assisted by rounding corners and providing guide walls. Using a numerical model to figure out what is wrong and how to fix it will help the facility’s costs and maintenance decrease in the long run.

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Study on the Vortex in a Pump Sump and Its Influence on the Pump Unit

Cited by 5 publications

References 34 publications

A Study Comparing the Subsurface Vortex Characteristics in Pump Sumps

A Study Comparing the Subsurface Vortex Characteristics in Pump Sumps

Numerical and Experimental Study on the Shutdown Transition Process of a Large Axial Flow Pump System Focusing on the Influence of Gate Control

Hydraulic Performance of Seawater Intake System Using CFD Modeling

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