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| Numerical simulation of mechanism for sill rectifying flow in pumping station intake |
| Luo Can, Cheng Li, Liu Chao |
| School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China |
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Abstract To eliminate vortices in a pumping station intake, the flow patterns in the intakes without and with a sill in their bottom were simulated based on the incompressible N-S equations, Realizable k-ε turbulence model and SIMPLE algorithm. It was shown that there were large recirculation zones in both sides of the intake without a sill and the main stream was obviously off the central line and shif-ted to one side, causing unbalance flow rate in both sides. For the intakes with a sill, the large recirculation zones still existed if the sill was placed further away from the intake outlet and the main stream kept to be shifted one side considerably as well. If the sill was moved to the intake outlet closer, the vortices shed from the sill could disturb the flow pattern near the outlet straightforward. When the sill was located at the distance(7-10)D away from the intake outlet, then the flow pattern was improved significantly, leading to the flow rate distributed uniformly into each pump suction pipe. The downstream recirculation zone at the bottom of the sill kept shrunk until it disappeared at all with increasing height of the sill, eventually, an upstream recirculation zone occurred. It was illustrated that a better flow pattern was achievable with the height of approximate 0.3H′. Note that the top width of sill had a less effect on the flow pattern. The predicted flow patterns were in good agreement with the measurements. These outcomes can be useful for flow pattern improvement in pumping station intakes with expanding width towards the intake outlet, but also has practical significance.
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Received: 24 March 2013
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