Abstract：Hydraulic performance of centrifugal pump with a large blade discharge angle of 44°was investigated numerically with FLUENT when both water and viscous oils were used as working fluids.Attention was paid on the effect of liquid viscosity on the pump performance through examining several critical variables,such as impeller theoretical head,slip factor,hydraulic efficiency and hydraulic loss coefficient etc.Moreover,the computed pump head and efficiency were compared with the experimental data.The causes for the "sudden-rising head effect" and the peak onset on the impeller theoretical head curve at a low flow rate were clarified.It shows that a partial agreement between CFD simulations and experiments is achieved for the pump head and efficiency.Although the "sudden-rising head effect" onset is well predicted,unlike that in the experiments,it cannot persist in a wide range of liquid viscosity.The substantial interaction between volute and impeller at a low flow rate gives rise to the peak occurrence in the impeller theoretical head curves.The increased blade discharge angle results in the increasing hydraulic losses in the volute at the whole working condition and in the impeller at the low flow rate,but decreasing losses in the impeller at the high flow rate.
李文广. 大出口角叶轮离心泵输送粘油性能计算[J]. 排灌机械工程学报, 2009, 27(5): 291-296.
Li Wenguang. Performance computations of centrifugal pump with large blade discharge angle for handling viscous oils. Journal of Drainage and Irrigation Machinery Engin, 2009, 27(5): 291-296.
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