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Improvement of Internal Flow Performance of a Centrifugal Pump-As-Turbine (PAT) by Impeller Geometric Optimization

Author

Listed:
  • Jian Xu

    (National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
    Institute of Fluid Engineering Equipment, JITRI, Jiangsu University, Zhenjiang 212013, China)

  • Longyan Wang

    (National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
    Institute of Fluid Engineering Equipment, JITRI, Jiangsu University, Zhenjiang 212013, China
    School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane 4001, QLD, Australia)

  • Stephen Ntiri Asomani

    (National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
    Institute of Fluid Engineering Equipment, JITRI, Jiangsu University, Zhenjiang 212013, China)

  • Wei Luo

    (National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
    Institute of Fluid Engineering Equipment, JITRI, Jiangsu University, Zhenjiang 212013, China)

  • Rong Lu

    (National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
    Institute of Fluid Engineering Equipment, JITRI, Jiangsu University, Zhenjiang 212013, China)

Abstract

Rotor-stator interaction (RSI) in the centrifugal pump-as-turbine (PAT) is a significant source of high amplitude of the pressure pulsation and the flow-induced vibration, which is detrimental to the stable operation of PAT. It is therefore imperative to analyze the rotor-stator interaction, which can subsequently be used as a guideline for reducing the output of PAT noise, vibration and cavitation. In addition, it is important for a PAT to have a wide operating range preferably at maximum efficiency. In order to broaden the operating range, this work proposes a multi-condition optimization scheme based on numerical simulations to improve the performance of a centrifugal PAT. In this paper, the optimization of PAT impeller design variables (b 2 , β 1 , β 2 and z) was investigated to shed light upon its influence on the output efficiency and its internal flow characteristics. Thus, the aim of the study is to examine the unsteady pressure pulsation distributions within the PAT flow zones as a result of the impeller geometric optimization. The numerical results of the baseline model are validated by the experimental test for numerical accuracy of the PAT. The optimized efficiencies based on three operating conditions (1.0 Q d , 1.2 Q d , and 1.4 Q d ) were maximally increased by 13.1%, 8.67% and 10.62%, respectively. The numerical results show that for the distribution of PAT pressure pulsations, the RSI is the main controlling factor where the dominant frequencies were the blade passing frequency (BPF) and its harmonics. In addition, among the three selected optimum cases, the optimized case C model exhibited the highest level of pressure pulsation amplitudes, while optimized case B reported the lowest level of pressure pulsation.

Suggested Citation

  • Jian Xu & Longyan Wang & Stephen Ntiri Asomani & Wei Luo & Rong Lu, 2020. "Improvement of Internal Flow Performance of a Centrifugal Pump-As-Turbine (PAT) by Impeller Geometric Optimization," Mathematics, MDPI, vol. 8(10), pages 1-23, October.
    • Handle: RePEc:gam:jmathe:v:8:y:2020:i:10:p:1714-:d:423856
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    References listed on IDEAS

    as
    1. Stephen Ntiri Asomani & Jianping Yuan & Longyan Wang & Desmond Appiah & Kofi Asamoah Adu-Poku, 2020. "The Impact of Surrogate Models on the Multi-Objective Optimization of Pump-As-Turbine (PAT)," Energies, MDPI, vol. 13(9), pages 1-29, May.
    2. Wang, Longyan & Zuo, Ming J. & Xu, Jian & Zhou, Yunkai & Tan, Andy C., 2019. "Optimizing wind farm layout by addressing energy-variance trade-off: A single-objective optimization approach," Energy, Elsevier, vol. 189(C).
    3. Jain, Sanjay V. & Patel, Rajesh N., 2014. "Investigations on pump running in turbine mode: A review of the state-of-the-art," Renewable and Sustainable Energy Reviews, Elsevier, vol. 30(C), pages 841-868.
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    Cited by:

    1. Wang, Tao & Yu, He & Xiang, Ru & Chen, XiaoMing & Zhang, Xiang, 2023. "Performance and unsteady flow characteristic of forward-curved impeller with different blade inlet swept angles in a pump as turbine," Energy, Elsevier, vol. 282(C).
    2. Wang, Tao & Xiang, Ru & Yu, He & Zhou, Min, 2023. "Performance improvement of forward-curved impeller with an adequate outlet swirl using in centrifugal pump as turbine," Renewable Energy, Elsevier, vol. 204(C), pages 67-76.

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