Theoretical model of transient mixed-flow pump start-up
LU Yangping1, MA Can2, TAN Lei1, HAN Yadong1
1. State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China; 2. Science and Technology on Thermal Energy and Power Laboratory, Wuhan Second Ship Design and Research Institute, Wuhan 430205, China
Abstract：Start-up transients in mixed-flow pumps are very complex due to the flow variations and rotational stall during start-up. A transient head equation was solved with a pipe resistance equation in this study to give a theoretical model for the varying flow rate and head during start-up of a mixed-flow pump. The model included the rotational acceleration to predict the variation of the flowrate and head during start-up. The start-up was also modeled with a three-dimensional numerical model of the mixed-flow pump and pipe system to predict the transient pump characteristics. The model predictions agree well with the numerical results to validate the theoretical model. During start-up, the flowrate does not increase as fast as the speed but continues to slowly increase after the pump has reached the maximum rotational speed. The transient pump head can be divided into the steady-state head, the acceleration head and the inertia head with the acceleration and inertia heads greatly influencing start-up.
鲁阳平, 马灿, 谭磊, 韩亚东. 混流泵启动过程瞬态性能理论模型[J]. 清华大学学报（自然科学版）, 2022, 62(12): 1938-1944.
LU Yangping, MA Can, TAN Lei, HAN Yadong. Theoretical model of transient mixed-flow pump start-up. Journal of Tsinghua University(Science and Technology), 2022, 62(12): 1938-1944.
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2022, Vol. 62 
