Numerical analysis and prediction of hydraulic performance of vertical axial-flow pump system model
WANG Lihui1, SHI Wei1, SHEN Changrong1, XU Lei2
1.Jiangsu Water Source Company Ltd. of the Eastern Route of the Eastern Route of the South-to-North Water Diversion Project, Nanjing, Jiangsu 210029, China; 2.School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China
Abstract:Relying on the design parameters of a low head pumping station in the first phase of east route in the South-to-North Water Diversion Project, the flow in a low head vertical flow pump system model, which consists of an elbow inlet channel, axial flow pump itself and siphon outlet conduit, is simulated based on the steady, 3D, turbulent, Reynolds averaged N-S equations and RNG k-ε turbulence model. The flow pattern in the model and the pressure distribution on the impeller blade surfaces are analysed under three typical conditions, namely, small discharge(0.180 m3/s), design discharge(0.299 m3/s)and large discharge(0.360 m3/s). The hydraulic performance of the pump model is predicted and compared with the test result. The results indicate that the numerical results are basically consistent with the test data, especially at the best efficiency point, and the maximum error is less than 2% within the flow rate interested. Under design flow condition, the 3D turbulent flows in the inlet and outlet conduits are basically the same as the flows in the inlet and outlet conduits when they are simulated separately. The flow fields in the inlet conduit remain the same under different operating conditions, but these in the outlet conduit don′t. Nonetheless, in the paper, the outcomes in 3D turbulent flow in the vertical axial flow pump system model under different operating conditions can provide a reference for the study on optimum hydraulic design of a low-head pump system under multi-operation condition.
王丽慧, 施伟, 沈昌荣, 徐磊. 立式轴流泵装置模型水力性能数值分析及预测[J]. 排灌机械工程学报, 2016, 34(9): 776-782.
WANG Lihui, SHI Wei, SHEN Changrong, XU Lei. Numerical analysis and prediction of hydraulic performance of vertical axial-flow pump system model. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(9): 776-782.
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