Numerical simulation of water supply pipe position to intake of small-sized pumping station
CHEN Yichun1, ZHANG Hui1, DAI Sheng1, GAO Jun1, XIA Bin2
1. Zhenjiang Water Company, Zhenjiang, Jiangsu 212000, China; 2. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：To explore the flow instability in an intake of secondary water supply pumping station and study effects of water supply pipe position to the intake on flow patter in pump suction pipes, Ansys-CFX fluid simulation software was used to calculate the three-dimensional steady turbulent flow in the intake. The fluid domain includes the water supply pipe, intake, and a few pump suction pipes. In the simulations, the water supply flow rate was kept the same, but the supply pipe had two positions. Based on the obtained flow condition in the pump suction pipes and the hydraulic loss in the suction pipes as well as the velocity distribution in several cross-sections, an improved design was proposed. The flow condition in that design was checked accordingly. The results show that vortex and flow turbulence exist, and the uniformity of axial velocity is poor as well as the flow average derivation angle is larger in the pump suction pipes in pump intake A, where the water supply pipe is opposite to suction pipe #5, suggesting an unsatisfactory inlet flow condition to the pumps. When the water supply pipe position was altered to the left and right sides by 1.375 m, the hydraulic loss in suction pipe #5 was only 3.301 cm and 3.258 cm, respectively, in comparison with 6.579 cm loss in the original design. Furthermore, the uniformity of axial velocity increased, and the flow average derivation angle decreased, showing an improved inlet flow condition. Therefore, in order to improve the flow instability at pump inlet, the water supply pipe to the intake should prevent from being rightly against a pump suction pipe.
[1]杲东彦, 牛兵. 泵站进水池进口边界条件处理方法的研究[J]. 南京工程学院学报(自然科学版),2007,5(4):33-37. GAO Dongyan, NIU Bing. Research into the method of handling inlet boundary conditions of intake sump of pumping station[J]. Journal of Nanjing Institute of Technology(natural science edition), 2007,5(4):33-37.(in Chinese)[2]成立, 刘超. 基于CFD技术的泵站进水池水力性能研究[J]. 河海大学学报(自然科学版),2009,37(1):52-56. CHEN Li, LIU Chao. Hydraulic performance of pump sumps based on CFD approach[J]. Journal of Hohai University(natural sciences),2009,37(1):52-56.(in Chinese)[3]刘梅清, 林琦, 梁兴, 等. 泵站前池流态改善效果的数值模拟分析[J]. 武汉大学学报(工学版),2012,45(2):152-156. LIU Meiqing, LIN Qi, LIANG Xing, et al. Numerical simulation research on improving flow pattern of forebay of a pumping station[J]. Engineering journal of Wuhan University, 2012,45(2): 152-156.(in Chinese)[4]CHEN Hongxun, GUO Jiahong. Numerical simulation of 3-D turbulence flow in the multi-intakes sump of the pump station[J]. Journal of hydrodynamics, 2007,19(1):42-47.[5]TANG Xuelin, WANG Wuchang, WANG Fujun, et al. Application of LBM-SGS model to flows in a pumping station forebay[J]. Journal of hydrodynamics, 2010,22(2):196-206.[6]CHENG Bin, YU Yonghai. CFD simulation and optimization for lateral diversion and intake pumping stations[J]. Procedia engineering, 2012,28:122-127.[7]付强,袁寿其,朱荣生. 大型给水泵站进、出水流道数值模拟及优化设计[J]. 中国给水排水, 2012,28(1):48-51. FU Qiang, YUAN Shouqi, ZHU Rongsheng. Numerical simulation and optimal design of inflow and outflow conduits of large pump station[J]. China water & wastewater, 2012,28(1):48-51.(in Chinese)[8]陈上志,崔晓钰,翁建华, 等. 泵站进水池流场的数值模拟[J]. 给水排水,2014,40(7): 168-170. CHEN Shangzhi, CUI Xiaoyu, WENG Jianhua, et al. Numerical simulation of intake sump of pumping station[J]. Water & wastewater engineering, 2014,40(7): 168-170.(in Chinese)[9]朱红耕,袁寿其. 大型泵站肘形进水流道三维紊流仿真计算[J]. 中国农村水利水电, 2005(4): 42-43,48. ZHU Honggeng, YUAN Shouqi. Simulation of the three-dimensional turbulence for elbow-shaped inlet duct in large-sized pumping station[J]. China rural water and hydropower, 2005(4): 42-43,48.(in Chinese)
