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| Numerical simulation on hydraulic characteristics in water diversion bifurcated pipes of pumped storage power station |
| ZHENG Yuan, YAN Ji-song, ZHANG Zhan, XU Guang-wen |
| College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
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Abstract The hydraulic characteristics in water diversion bifurcated pipes in pumped storage plant were calculated by 3-D numerical simulation under different operation conditions(pumping or generating)and different flow ratio(single machine operation or many).Unstructured grid was used to discretize the model,finite volume method was used to divert equation′s integral pattern into algebra equations,second order upwind scheme was used and calculated by implicit method to ensure precision,and SIMPLE method was adopted to couple pressure and velocity.Water head loss and the flow pattern were analyzed under various conditions in bifurcated pipes.It is shown that the computation results are consistent with the experimental data.Because the energy transfers after converging current from different energy,water head loss in pumping is minus,the flow pattern in generating is better than that in pumping;and water head loss is larger in generating and smaller in pumping.The results provide the basis for turbine′s running mode,and minimize the energy loss to the least.
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Received: 08 August 2013
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