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.
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