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.
LIANG Jin-Dong,LU Lin-Guang,LIU Rong-Hua et al. Influence of middle division pier on hydraulic performance in pumping station outlet conduit[J]. Journal of Drainage and Irrigation Machinery Engin, 2011, 29(1): 77-81.
Gao Hong,Lin Wanlai,Du Zhaohui.Numerical flow and performance analysis of a water-et axial flow pump[J].Ocean Engineering,2008,35(16):1604-1614.
仇宝云,冯晓莉,袁寿其,等.大型泵站双孔出水流道偏流分析[J].水力发电学报,2005,24(6):110 -114,120.Qiu Baoyun,Feng Xiaoli,Yuan Shouqi,et al.Analysis of flow deviation in two-channel discharge passage of a large pump station[J].Journal of Hydroelectric Engineering,2005,24(6):110-114,120.(in Chinese)
Constantinescu G S,Patel V C.Numerical model for simulation of pump-intake flow and vortices[J].Journal of Hydraulic Engineering,1998,124(2):123-134.
陆林广,吴开平,冷豫,等.泵站出水流道模型水力损失的测试[J].排灌机械,2005,23(5):23-26.Lu Linguang,Wu Kaiping,Leng Yu,et al.Measurement for hydraulic loss of outlet conduit of pumping station[J].Drainage and Irrigation Machinery,2005,23 (5):23-26.(in Chinese)
Blazek J.Computational Fluid Dynamics:Principles and Applications[M].2nd ed.Oxford:Elsevier Ltd.,2005:271-302.
Muggii F A,Eisele K,Casey M V,et al.Flow analysis in a pump diffuser--Part 2:Validation and limitations of CFD for diffuser flows[J].Journal of Fluids Engineering,1997,119(4):978-984.
Rodi W.Turbulence Models and Their Application in Hydraulics--A State of the Art Review[M].Delft:IAHR Section on Fundamentals of Division Ⅱ--Experimental and Mathematical Fluid Dynamics,1980:44-46.
陆林广,呆东彦,祝捷.大型泵站虹吸式出水流道优化水力设计[J].农业机械学报,2005,36(4):60-63.Lu Linguang,Gao Dongyan,Zhu Jie.Optimum hydraulic design of siphon outlet in large pumping stations[J].Transactions of the Chinese Society for Agricultural Machinery,2005,36(4):60-63.(in Chinese)
陆林广,吴开平,冷豫,等.大型低扬程泵站直管式出水流道优化水力设计[J].农业机械学报,2007,38(8):196-198.Lu Linguang,Wu Kaiping,Leng Yu,et al.Optimum hydraulic design of straight outlet conduit in large low head pumping stations[J].Transactions of the Chinese society for Agricultural Machinery,2007,38(8):196-198.(in Chinese)
陆林广,刘军,梁金栋,等.大型泵站出水流道三维流动及水力损失数值计算[J].排灌机械,2008,26(3):51-54.La Linguang,Liu Jun,Liang Jindong,et al.Numerical simulation of 3D turbulent and hydraulic loss in outlet conduit of large pumping station[J].Drainage and lrrigationMachinery,2008,26(3):51-54.(in Chinese)