Conduit Hydraulic optimization of the slanted pump system for Babao Pumping Station of Hangzhou
PAN Zhijun1, XU Lei2*, SHEN Xiaoyan3, HONG Fei2, ZHANG Hao1
1.Hangzhou Nanpai Construction Management Office, Hangzhou, Zhejiang 310000, China; 2.School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 3.Zhejiang Design Institute of Water Conservancy & Hydro-electirc Power, Hangzhou, Zhejiang 310002, China
In order to ensure the slanted pump system of Babao Pumping Station to operate safely, reliably and efficiently, the optimum hydraulic design on the station′s slanted inlet conduit and slanted outlet conduit has been completed by the method of three-dimensional turbulent flow numerical simulation. Based on the numerical simulation results, the influences of conduit height and pump shaft angle on the hydraulic performance of slanted inlet conduit were respectively studied and the influences of diffusion angle and pump shaft angle on the hydraulic performance of slanted outlet conduit were respectively studied. The results indicate that the larger the height of the slanted inlet conduit, the better the conduit hydraulic performance; the smaller the angle of pump shaft, the better the conduit hydraulic performance; the smaller the turn angle of inlet conduit is, the smaller the influence of centrifugal force is, and the more advantageously the flow adjusts; the smaller the diffusion angle of slanted outlet conduit, the better the conduit hydraulic performance, the larger the angle of pump shaft, the better the conduit hydraulic performance; affected by both the spiral flow and the S-shaped curving conduit which turns sharply, the asymmetric vortex exists inevitably in slanted outlet conduit; comprehensive consideration on the various factors of Babao Pumping Station such as conduit hydraulic performance, civil engineering quantity, hoisting height of sluice gate and installation and maintenance difficulty of pumping unit, the angle of pump shaft is determined as 20° for the slanted pump system of the station.
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