Hydraulic characteristics of pumping station equipped with closed water tank
Zi Dan1, Tian Ming2, Zou Yutao3, Wang Fujun1
1.College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China; 2. Jilin Water Supply for the Central City Co. Ltd., Changchun, Jilin 130061, China; 3. Jilin Water Conservancy and Hydropower Survey Design Institute, Changchun, Jilin 130021, China
Abstract：The closed water tank is suitable for a pumping station with great variation in water level in its front. However, there are rarely few studies on flow and hydraulic characteristics in such a kind of pumping station. Thus, the flow in a high-head water pumping station in Siping city, Jilin province is simulated by CFD code. Based on a grid independence analysis, the hydraulic loss and internal flow fields are calculated by means of the RNG k-ε turbulence model and SIMPLEC algorithm when a single pump, two and three pumps are in operation, respectively. It is shown that there is no vortex below the bell mouth in the water tank, and the streamlines in the suction pipe are relatively smooth, causing the flow without "S" shaped distortion. In addition, the axial velocity distribution and velocity-weighted average swirl angle at the bell mouth are more uniform by 1.8%,5.602°when one pump or two pumps close to the side walls of the tank are in operation but the middle pump is in stop than those when the middle pump is in operation but one of two pumps near the side walls is either in stop or in operation. Hence, the flow pattern in front of two pumps close to the side walls of the closed tank is better than the middle pump, showing an opposite situation to the suction sump. For a pumping station with closed tank, if one or two pumps is/are in operation is needed, it is suggested that one pump or two pumps near the side walls should be operated in priority.
资丹, 田明, 邹玉涛, 王福军. 装备封闭式吸水罐的泵站水力学特性[J]. 排灌机械工程学报, 2015, 33(9): 768-772.
Zi Dan, Tian Ming, Zou Yutao, Wang Fujun. Hydraulic characteristics of pumping station equipped with closed water tank. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(9): 768-772.
[1]唐再生. 吸水罐设计[J]. 工程设计与研究, 1997(4): 48-50. Tang Zaisheng. Design of water tank[J]. Engineering Design and Research, 1997(4):48-50.(in Chinese)[2]成立, 刘超, 周济人, 等. 泵站开敞式进水池几何参数的数值模拟[J]. 农业机械学报, 2009,40(1):50-55. Cheng Li, Liu Chao, Zhou Jiren, et al. Numerical simulation on geometrical parameters for open pump sump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2009,40(1):50-55.(in Chinese)[3]Cong Guohui, Wang Fujun. Numerical investigation on the flow structure and vortex behavior at a large scale pump sump[C]//Proceedings of 5th Joint ASME/JSME Fluids Engineering Conference. San Diego, California, USA, 2007(FEDSM2007-37509):1-9.[4]陆林广, 徐磊, 梁金栋, 等. 泵站进水流道三维流动及水力损失数值模拟[J]. 排灌机械, 2008,26(5):55-58. Lu Linguang, Xu Lei, Liang Jindong, et al. Numerical simulation for 3D turbulent flow and hydraulic loss of inlet conduit for pumping station[J]. Drainage and Irrigation Machinery, 2008,26(5):55-58.(in Chinese)[5]朱红耕,袁寿其. 进口流场对虹吸式出水流道的性能影响[J]. 农业机械学报,2006,37(10):193-196. Zhu Honggeng, Yuan Shouqi. The influences of import flow field on siphon outlet conduit performance[J]. Transactions of the Chinese Society for Agricultural Machinery, 2006,37(10):193-196.(in Chinese)[6]Cheng Li, Liu Chao, Zhou Jiren, et al. The study on the flow fields and hydraulic performance in the pump sump[C]//Proceedings of 5th Joint ASME/JSME Fluids Engineering Conference. San Diego, California USA, 2007(FEDSM2007-37398):1-9.[7]王发利. SIMPLEC算法在宁夏河渠冬季结冰问题数值模拟中的应用[D]. 宁夏:北方民族大学信息与计算科学学院,2009.[8]王福军.计算流体动力学分析——CFD软件原理与应用[M]. 北京:清华大学出版社, 2004:220-224.[9]郑双凌,马吉明,南春子,等. 预应力钢筒混凝土管(PCCP)的阻力系数与粗糙度研究[J]. 水力发电学报, 2012,31(3):126-130. Zheng Shuangling, Ma Jiming, Nan Chunzi, et al. Study on drag coefficient and roughness of prestressed concrete cylinder pipe[J]. Journal of Hydroelectric Engineering, 2012,31(3):126-130.(in Chinese)[10] 陆林广, 曹志高, 周济人. 开敞式进水池优化水力计算[J]. 水利学报, 1997,28(3):16-25. Lu Linguang, Cao Zhigao, Zhou Jiren. The optimum hydraulic design of pump intakes[J]. Journal of Hydraulic Engineering, 1997,28(3):16-25.(in Chinese)
