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An improved turbulence model for predicting unsteady cavitating flows in centrifugal pump

Jian Wang (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China)
Yong Wang (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China)
Houlin Liu (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China)
Haoqin Huang (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China)
Linglin Jiang (Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 1 June 2015

570

Abstract

Purpose

The purpose of this paper is to study the unsteady caivitating flows in centrifugal pump, especially for improving the turbulence model to obtain highly resolution results-capable of predicting the cavitation inception, shedding off and collapse procedures.

Design/methodology/approach

Both numerical simulations and experimental visualizations were performed in the present paper. An improved RCD turbulence models was proposed by considering three corrected methods: the rotating corrected method, the compressible corrected method and the turbulent viscosity corrected method. Unsteady RANS computations were conducted to compare with the experiments.

Findings

The comparison of pump cavitation performance showed that the RCD turbulence model obtained better performance both in non-cavitation and cavitation conditions. The visualization of the cavitation evolution was recorded to validate the unsteady simulations. Good agreement was noticed between calculations and visualizations. It is indicated the RCD model can successfully capture the bubbles detachment and collapse at the rear of the cavity region, since it effectively reduces the eddy viscosity in the multiphase region of liquid and vapor. Furthermore, the eddy viscosity, the instantaneous pressure and density distribution were investigated. The effectiveness of the compressibility was found. Meanwhile, the influence of the rotating corrected method on prediction was explored. It is found that the RCD model solved more unsteady flow characteristics.

Originality/value

The current work presented a turbulence model which was much more suitable for predicting the cavitating flow in centrifugal pump.

Keywords

Acknowledgements

The authors would like to thank the support by the National Natural Science Foundation of China (Nos 51239005, 51309120, 51109095, 51179075), the National Science & Technology Pillar Program of China (Nos 2011BAF14B03, 2013BAF01B02 and 2013BAK06B02); The Scientific Research Innovation Program in Colleges and Universities of Jiangsu Province (Grant No. CXLX12_0640).

Citation

Wang, J., Wang, Y., Liu, H., Huang, H. and Jiang, L. (2015), "An improved turbulence model for predicting unsteady cavitating flows in centrifugal pump", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 25 No. 5, pp. 1198-1213. https://doi.org/10.1108/HFF-07-2014-0205

Publisher

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Emerald Group Publishing Limited

Copyright © 2015, Emerald Group Publishing Limited

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