Abstract
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.
Highlights
The collection and transportation of storm water is of great importance for flood control and urban water management
Experimental rig and instruments for the prefabricated pumping station complied with the test
It is evident that all distributions displayed in 8 are sand volume fraction is associated with weak sand particle deposition at the tank bottom
Summary
The collection and transportation of storm water is of great importance for flood control and urban water management. In comparison with traditional pumping stations, the PPS is free of the shortages of large volume and high-cost maintenance [1,2] Such a new pumping station can be used to transport liquid at high flow rates, which is beneficial for the treatment of storm water in urban areas [3]. As the mixture of water and sand particles is transported, flows in the prefabricated pumping station are complex and significantly influence the operation of the pumping station. Cleaning is not an easy task once solid particles deposit at the bottom of the storage tank. Cheng et al investigated effects of solid-phase parameters on flows in a molten-salt pump via numerical simulation; the results agreed well with the experimental data [9]. It is anticipated to provide a reference for the optimal design and stable operation of the prefabricated pumping station
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