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Numerical simulation of transient flow field in a mixed-flow pump during starting period

Wei Li (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China)
Yang Zhang (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China)
Weidong Shi (College of Mechanical Engineering, Nantong University, Nantong, China)
Leilei Ji (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China)
Yongfei Yang (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China)
Yuanfeng Ping (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Publication date: 3 April 2018

Abstract

Purpose

This paper aims to study the transient flow characteristics in a mixed-flow pump during the start-up period.

Design/methodology/approach

In this study, numerical calculation of the internal flow field in a mixed-flow pump using the sliding mesh method was carried out. The regulation of the pressure, streamline and the relative speed during the start-up period was analyzed.

Findings

The trend of the simulated head is consistent with the experimental results, and the calculated head is around 0.3 m higher than the experimental head when the rotation speed reached the stable stage, indicating that the numerical method for the start-up process simulation of the mixed-flow pump has a high accuracy. At the beginning, the velocity inside the impeller changes little along the radius direction and the flow rate increases slowly during the start-up process. As the rotation speed reached the stable stage, the flow inside the impeller became steady, the vortex reduced and transient effects disappeared gradually.

Originality/value

The study results have significant value for revealing the internal unsteady flow characteristics of the mixed-flow pump and providing the reference for the design optimization of the mixed-flow pump.

Keywords

Acknowledgements

The work was sponsored by the National Natural Science Foundation of China (No. 51679111, No. 51409127 and No. 51579118), PAPD, Six Talents Peak Project of Jiangsu Province (No. HYZB-002), Key R&D projects in Jiangsu Province (BE2015119, BE2015001-4, BE2016319, BE2017126), the Natural Science Foundation of Jiangsu Province (No. BK20161472), Science and Technology Support Program of Changzhou (No.CE20162004) and Scientific Research Start Foundation Project of Jiangsu University (No.13JDG105).

Citation

Li, W., Zhang, Y., Shi, W., Ji, L., Yang, Y. and Ping, Y. (2018), "Numerical simulation of transient flow field in a mixed-flow pump during starting period", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 28 No. 4, pp. 927-942. https://doi.org/10.1108/HFF-06-2017-0220

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Publisher

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Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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