Numerical Investigation on the Flow Structure and Vortex Behavior at a Large Scale Pump Sump

Cong, Guohui; Wang, Fujun

doi:10.1115/fedsm2007-37509

Cited by 3 publications

(4 citation statements)

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“…Qi Dunzhe et al [9] studied the operating performance of the pumping station under different numbers of start units and found that increasing the number of start units worsens the operating performance of the pumping station. Guohui Cong et al [13] investigated the vortex structure in the intake pool of the pumping station for different water levels and pump combinations and discovered the location and intensity of the vortex in different conditions. Wang et al [14] developed a mathematical model to solve the problem of large energy consumption of the start-stop scheme in the pumping station.…”

Section: Introductionmentioning

confidence: 99%

Internal Flow Characteristics of Centrifugal Pumps under Different Startup Combination Schemes

Zheng,

Wang,

Zhang

et al. 2024

Water

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Pump station engineering is a water conservancy project used for long-distance water transfer, irrigation and drainage, and urban living and industrial water supply. Centrifugal pumps are one of the main pump types commonly used in pumping stations, and their operation is of considerable importance for the safety, stability, and efficient operation of pumping stations. This paper takes a large pumping station with seven centrifugal pump units as the research object and combines experimental research and numerical simulation. The axial flow velocity uniformity, average cross-sectional deviation angle, and hydraulic loss of the pump inlet section are evaluated, and the internal flow characteristics of the pump under different startup combination conditions are analyzed based on entropy generation and vorticity. This study also explores the operational performance of the pump station under different startup combination conditions, revealing the mutual influence mechanism between different startup combinations of pump stations and the internal and external characteristics of centrifugal pumps and introducing the optimal startup combination scheme for the pump station system. Research results indicate that the difference in energy loss of centrifugal pumps under different startup combinations is mainly manifested in the impeller and guide vane flow channels. For the two existing inlet flow channel structures in the pump station, the unit effectively operates when the inlet flow channel is tilted to the left. The optimal startup combination method of the pump station under different startup combinations is determined.

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Section: Introductionmentioning

confidence: 99%

Internal Flow Characteristics of Centrifugal Pumps under Different Startup Combination Schemes

Zheng,

Wang,

Zhang

et al. 2024

Water

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“…Lu illustrated flow patterns in different suction boxes through numerical simulation and thereby proposed an optimized design scheme [10]. Cong et al analyzed numerically flow structures in the sump of a large-scale pump station and evaluated the function of the anti-vortex device [11]. Deshmukh et al analyzed the flow at the pump inlet based on numerical results and substantiated significant effects of local geometry on flow patterns in the pumping station [12].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Tank Bottom Shape for Improving the Anti-Deposition Performance of a Prefabricated Pumping Station

Kang

Teng

et al. 2019

Water

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High flexibility of prefabricated pumping stations in collecting and transporting storm water has been recognized. Nevertheless, flows inside such a complex system have rarely been reported. The present study aims to reveal water-sand flow characteristics in a prefabricated pumping station and to optimize geometric parameters of the tank to mitigate sand particle deposition. Five tank schemes, varying in the ratio of the diameter to the height of the tank bottom (D/L), were investigated. Flows in the pumping station were simulated using the computational fluid dynamics (CFD) technique. Test data were used to validate the numerical scheme. Three-dimensional water-sand flows in the pumping station were described. Underlying mechanisms of sand particle deposition were explained. The results indicate that the risk of deposition is high at the tank bottom side, close to the tank inlet. Both the tank bottom geometry and the inlet suction of the pump contribute to sand particle deposition. The averaged sand volume fraction at the pump inlet reaches its minimum at D/L = 3. Sand particle velocity at the pump inlet varies inversely with D/L. The highest intensity of the vortex at the pump inlet arises at D/L = 3. The best anti-deposition performance of the pumping station is attained at D/L = 3.

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“…In addition to the experimental studies, some numerical studies have also been carried out to investigate the vortex phenomenon in dam reservoirs. Cong et al (2007) performed a numerical simulation to investigate the strength and location of vortices under different operating conditions. They also examined the effect of three different anti-vortex devices on vortex strength [19].…”

mentioning

confidence: 99%

“…Cong et al (2007) performed a numerical simulation to investigate the strength and location of vortices under different operating conditions. They also examined the effect of three different anti-vortex devices on vortex strength [19]. Lucino et al (2010) investigated the formation of vortices in a pump sump with a computational fluid dynamics (CFD) code.…”

mentioning

confidence: 99%

Experimental and numerical investigation on effect of trash rack on flow properties at power intakes

et al. 2020

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In the present experimental and numerical research, the flow behavior in a reservoir and horizontal water intake was analyzed in the presence of surface vortices. To do so, velocity field, vortex strength, and Reynolds number in different horizontal sections in the reservoir and the energy loss and entrained air volume at horizontal intake pipe at three different relative submerged depths (S/D = 1, 1.5 and 2) and five intake Froude numbers (Fr = 0.8, 1.0, 1.2, 1.4, and 1.6) were investigated by installing two trash racks with 64% and 70% openings and one intake without trash rack. The velocity field and vortex strength were measured using Particle Tracking Velocimetry. Reynolds number, velocity, energy loss, and entrained air volume at horizontal intake pipe were computed by numerical simulations. The commercially available computational fluid dynamics program Flow‐3D, was used for the numerical modeling. Numerical simulations were validated by the experimental data. The experimental tests revealed that trash rack presence has a significant effect on reducing the vortex strength and velocity on the water surface. The vortex strength was decreased by 11% and 16% in the trash racks with 70% and 64% opening, respectively. Energy loss clearly increased with the installation of a trash rack. Energy loss in the trash rack with 70% opening was approximately 19–26%. In addition, some relationships were provided for calculation of vortex strength, velocity, and local energy loss in the water intake, which are in good agreement with the studies in the literature.

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Numerical Investigation on the Flow Structure and Vortex Behavior at a Large Scale Pump Sump

Cited by 3 publications

References 0 publications

Internal Flow Characteristics of Centrifugal Pumps under Different Startup Combination Schemes

Internal Flow Characteristics of Centrifugal Pumps under Different Startup Combination Schemes

Optimization of Tank Bottom Shape for Improving the Anti-Deposition Performance of a Prefabricated Pumping Station

Experimental and numerical investigation on effect of trash rack on flow properties at power intakes

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