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| Influence of middle division pier on hydraulic performance in pumping station outlet conduit |
| Liang Jindong, Lu Linguang, Liu Ronghua, Wang Gang |
（College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China） |
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Abstract In order to study the influence of middle division pier on the hydraulic performance of a low head pump system, 3D turbulent numerical simulation method was applied to calculate the flow patterns and hydraulic losses of a separated conduit of a certain low head pumping station. Under the design discharge that the middle division pier was set in the conduit, the hydraulic losses calculated were increased by 0.024 m and 0.033 m, respectively. Transparent conduit model experiments were carried out to validate the calculation results. The results of the model experiment are consistent with those of the numerical simulated ones. Based on the numerical simulation and model experiment results, the influence of the pier on the hydraulic performance for both siphon outlet conduit and straight outlet conduit were studied. The results indicate that the flow pattern in the conduit is asymmetrical due to the influence of the flow circulation at the outlet section of the pump guide vane. And consequently, the hydraulic performance of the conduit was affected to a certain extent by the pier. The longer the pier, the larger the influence.Therefore,the pier is unprofitable to the hydraulic performance of the conduit and the pier for alarge pumping station with low head could be removed if the structural design condition of the conduit is permitted.
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Received: 23 February 2010
Published: 30 January 2011
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