Investigation of Self-Priming Process of a Centrifugal Pump with Double Blades
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https://doi.org/10.1007/s11630-020-1370-7
Article ID: 1003-2169(2020)00-0000-00
Investigation of Self-Priming Process of a Centrifugal Pump with Double Blades QIAN Heng1, MOU Jiegang2, REN Yun3, ZHU Zhibing1, LIU Nuojia1, ZHENG Shuihua1, WU Denghao2* 1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China 2. College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, China 3. Zhijiang College, Zhejiang University of Technology, Shaoxing 312030, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: The gas-liquid two-phase flow patterns of a centrifugal pump during the self-priming process were investigated numerically and experimentally. The Euler-Euler multiphase model and SST k-ω turbulence model were applied for simulating the self-priming process. Meanwhile, the change of motor speed and self-priming height were considered in the simulation. The overall transient two-phase flow features and water level distributions were mapped. Results showed that the self-priming process was divided into three stages. The liquid level in inlet-pipe rose in oscillation during self-priming process. The variations of water level during self-priming process of numerical simulation and test result agreed well. The inlet-pipe (Ver) was filled at 22 s and 24 s respectively numerically and experimentally. The bubble cloud circulated in the volute during middle stage of self-priming process, and breakup into smaller bubbles by shear force and tongue, and then discharged into chamber. The bubbles in the outlet-pipe mainly included bubbly flow and slug flow at the last stage of self-priming process, which is morphologically consistent with the test results. Also, during the self-priming process, the reflux liquid was pressed by blades and fully mixed with gas; that is the way to realizing the function of self-priming.
Keywords: self-priming process, gas-liquid two-phase flow, centrifugal pump, gas-liquid mixing and separation, transient numerical simulation
1. Introduction Self-priming pump is widely used in municipal engineering, agricultural engineering, architectural engineering, and petrochemical industries due to its self-priming capacity. Currently, the application of numerical simulation in hydraulic performance design has become more and more mature [1‒4]. However, the numerical simulation has not been widely applied to study the self-priming performance of centrifugal pump Received: Jul 09, 2019
AE: ZHANG Renhui
due to its poor prediction accuracy and huge computation resources. Besides, the gas-liquid two-phase distribution in self-priming pump is extremely complex, and the mechanism of gas-liquid mixing and separation was not fully understood. Also, the design method for the improvement of self-priming capacity is still not fully developed, which restricts the development of self-priming pumps. Currently, many studies were undertaken to understand the flow patterns o
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