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.
罗灿, 成立, 刘超. 泵站正向进水前池底坎整流机理数值模拟[J]. 排灌机械工程学报, 2014, 32(5): 393-398.
Luo Can, Cheng Li, Liu Chao. Numerical simulation of mechanism for sill rectifying flow in pumping station intake. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(5): 393-398.
[1]刘超.水泵及水泵站[M].北京:中国水利水电出版社,2009.[2]Ferrari G E, Politano M, Weber L. Numerical simulation of free surface flows on a fish bypass[J].Computers & Fluids, 2009, 38(5): 997-1002.[3]Tang Xuelin, Wang Wuchang, Wang Fujun,et al. A-pplication of LBM-SGS model to flows in a pumping-station forebay[J].Journal of Hydrodynamics: Ser B, 2010, 22(2):196-206.[4]张贤明,吉庆丰.泵站前池流态的数值模拟[J].灌溉排水,2001,20(1):35-38,42. Zhang Xianming, Ji Qingfeng. Numerical simulation of three-dimensional turbulent flow in forebay of pumping station[J].Irrigation and Drainage,2001,20(1):35-38,42.(in Chinese)[5]杨帆,刘超,汤方平,等.大型立式轴流泵装置流道内部流动特性分析[J].农业机械学报,2011,42(5):39-43,55. Yang Fan, Liu Chao, Tang Fangping, et al. Characte-ritics of flow in large vertical axial flow pumping system[J]. Transactions of the Chinese Society for Agricultural Machinery, 2011,42(5):39-43,55.(in Chinese)[6]Roberge J A. Use of computational fluid dynamics(CFD)to model flow at pump intakes[D]. Worcester, USA: Worcester Polytechnic Institute, 1999.[7]朱红耕,袁寿其,刘厚林,等.进水流道对立式混流泵装置能量特性的影响[J].江苏大学学报:自然科学版,2007,28(1):46-50. Zhu Honggeng,Yuan Shouqi,Liu Houlin, et al. Influence of suction box on energy characteristics of vertical mixed-flow pumping systems[J].Journal of Jiangsu University:Natural Science Edition,2007,28(1):46-50.(in Chinese)[8]周龙才.泵站前池隔墩整流的数值分析[J].长江科学院院报,2010,27(2):31-33. Zhou Longcai. Numerical analysis on improvement of flow conditions in forebay of pumping station by setting separation piers[J].Journal of Yangtze River Scientific Research Institute,2010,27(2):31-33.(in Chinese)[9]严忠民,周春天,闫文立,等.平原水闸泵站枢纽布置与整流措施研究[J]. 河海大学学报:自然科学版, 2000,28(2):50-53. Yan Zhongmin,Zhou Chuntian,Yan Wenli,et al. Study on the layout of combined sluice-pump station projects and modification of flow pattern[J].Journal of Hohai U-niversity: Natural Sciences,2000,28(2):50-53.(in Chinese)[10]成立,刘超,周济人,等.泵站前池底坝整流数值模拟研究[J].河海大学学报:自然科学版,2001,29(3):42-45. Cheng Li, Liu Chao, Zhou Jiren, et al. Numerical si-mulation of sill flows in the forebay of pumping station[J].Journal of Hohai University: Natural Sciences, 2001,29(3):42-45.(in Chinese)[11]刘超,成立,汤方平.取水前池复杂流动数值模拟[J].华北水利水电学院学报,2001,22(3):35-39. Liu Chao,Cheng Li,Tang Fangping. Numerical simulation of three-dimensional turbulent flow for pumping forebay[J].Journal of North China Institute of Water Conservancy and Hydroelectric Power,2001,22(3):35-39.(in Chinese)[12]李百齐,张有敬,王天奎,等.压水板/导流墩组合导流装置的开发及其在上海污水治理二期工程SB泵站前池中的应用研究[J].船舶力学,2002,6(2):22-26. Li Baiqi,Zhang Youjing,Wang Tiankui,et al. Development and application of a flow guide combination of depressed plate and guide piers in the front basin of SB pump station in Shanghai sewage treatment project Ⅱ[J]. Journal of Ship Mechanics, 2002, 6(2):22-26.(in Chinese)[13]周济人,刘超,汤方平,等.泵站复杂前池内的流态改善研究[J].江苏农学院学报,1998,19(4):93-96. Zhou Jiren,Liu Chao,Tang Fangping, et al. Study on improving flow pattern of the complicated forebay of a pumping station[J].Journal of Jiangsu Agricultural Co-llege, 1998, 19(4):93-96.(in Chinese)[14]高传昌,刘新阳,石礼文, 等.泵站前池与进水池整流方案数值模拟[J]. 水力发电学报,2011,30(2):54-59. Gao Chuanchang,Liu Xinyang,Shi Liwen, et al. Numerical simulation of flow pattern modification schemes for the forebay and suction sump of pumping station[J].Journal of Hydroelectric Engineering, 2011,30(2):54-59.(in Chinese)[15]田家山.给、排水泵站进水流态紊乱的危害与对策[J].河海大学学报,1988,16(2):10-19. Tian Jiashan. The harm of turbulent flow in pumping station and countermeasures[J].Journal of Hohai University,1988,16(2):10-19.(in Chinese)[16]冯旭松.泵站前池底坎整流及坎后流动分析[D].扬州:扬州大学农学院, 1996.