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Numerical simulation of transient flow in a shaft extension tubular pump unit during runaway process caused by power failure

Author

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  • Kan, Kan
  • Zheng, Yuan
  • Chen, Huixiang
  • Zhou, Daqing
  • Dai, Jing
  • Binama, Maxime
  • Yu, An

Abstract

To explore the load impact and instantaneous flow characteristics of a tubular pump under unconventional operating conditions, the runaway condition caused by the unit power failure are investigated. Unsteady three-dimensional (3D) numerical simulation and model test were executed on whole flow system of the pump, where a 3D VOF method was specifically adopted to simulate water surfaces of the upstream and downstream reservoirs. The results of numerical simulation in terms of system performance parameters and runaway speed presented a quite good agreement with the experimental data. During the transient process, both the rotational speed and flow rate of the pump unit were found to rapidly decrease with time until maximum runaway speed (1.51n0) was reached, where however, a time lag of 0.7s between the rotational speed and flow rate has been noticed. The explored increase of pressure pulsations is generally believed to have taken source from incurred water shock waves, where the main pulsation frequencies throughout the whole flow passage were the blade passing frequency (BPF) and its harmonics. Large flow vortical structures immerged within the rear guide vanes when the flow rate decreased to zero, while the same flow vortices appeared within the front guide vanes when the impeller rotational speed gradually fell to zero. This study’s results provide a meaningful reference about pump transient operations, leading to the prevention of associated structural vibrations and possible blade cracks, for safe operations of the pumping stations.

Suggested Citation

  • Kan, Kan & Zheng, Yuan & Chen, Huixiang & Zhou, Daqing & Dai, Jing & Binama, Maxime & Yu, An, 2020. "Numerical simulation of transient flow in a shaft extension tubular pump unit during runaway process caused by power failure," Renewable Energy, Elsevier, vol. 154(C), pages 1153-1164.
    • Handle: RePEc:eee:renene:v:154:y:2020:i:c:p:1153-1164
    DOI: 10.1016/j.renene.2020.03.057
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    References listed on IDEAS

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    1. Huixiang Chen & Daqing Zhou & Yuan Zheng & Shengwen Jiang & An Yu & You Guo, 2018. "Load Rejection Transient Process Simulation of a Kaplan Turbine Model by Co-Adjusting Guide Vanes and Runner Blades," Energies, MDPI, vol. 11(12), pages 1-18, November.
    2. Eve Cathrin Walseth & Torbjørn K. Nielsen & Bjørnar Svingen, 2016. "Measuring the Dynamic Characteristics of a Low Specific Speed Pump—Turbine Model," Energies, MDPI, vol. 9(3), pages 1-12, March.
    3. Fu, Xiaolong & Li, Deyou & Wang, Hongjie & Zhang, Guanghui & Li, Zhenggui & Wei, Xianzhu, 2018. "Influence of the clearance flow on the load rejection process in a pump-turbine," Renewable Energy, Elsevier, vol. 127(C), pages 310-321.
    4. Fu, Shifeng & Zheng, Yuan & Kan, Kan & Chen, Huixiang & Han, Xingxing & Liang, Xiaoling & Liu, Huiwen & Tian, Xiaoqing, 2020. "Numerical simulation and experimental study of transient characteristics in an axial flow pump during start-up," Renewable Energy, Elsevier, vol. 146(C), pages 1879-1887.
    5. Li, Deyou & Wang, Hongjie & Li, Zhenggui & Nielsen, Torbjørn Kristian & Goyal, Rahul & Wei, Xianzhu & Qin, Daqing, 2018. "Transient characteristics during the closure of guide vanes in a pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 118(C), pages 973-983.
    6. Rezghi, A. & Riasi, A., 2016. "Sensitivity analysis of transient flow of two parallel pump-turbines operating at runaway," Renewable Energy, Elsevier, vol. 86(C), pages 611-622.
    7. Daqing Zhou & Huixiang Chen & Languo Zhang, 2018. "Investigation of Pumped Storage Hydropower Power-Off Transient Process Using 3D Numerical Simulation Based on SP-VOF Hybrid Model," Energies, MDPI, vol. 11(4), pages 1-16, April.
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    Cited by:

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    2. Chen, Huixiang & Zhou, Daqing & Kan, Kan & Guo, Junxun & Zheng, Yuan & Binama, Maxime & Xu, Zhe & Feng, Jiangang, 2021. "Transient characteristics during the co-closing guide vanes and runner blades of a bulb turbine in load rejection process," Renewable Energy, Elsevier, vol. 165(P2), pages 28-41.
    3. Qigang Zhu & Yifan Liu & Ming Liu & Shuaishuai Zhang & Guangyang Chen & Hao Meng, 2021. "Intelligent Planning and Research on Urban Traffic Congestion," Future Internet, MDPI, vol. 13(11), pages 1-17, November.
    4. Binama, Maxime & Kan, Kan & Chen, Hui-Xiang & Zheng, Yuan & Zhou, Daqing & Su, Wen-Tao & Muhirwa, Alexis & Ntayomba, James, 2021. "Flow instability transferability characteristics within a reversible pump turbine (RPT) under large guide vane opening (GVO)," Renewable Energy, Elsevier, vol. 179(C), pages 285-307.
    5. Feng, Chen & Zheng, Yuan & Li, Chaoshun & Mai, Zijun & Wu, Wei & Chen, Huixiang, 2021. "Cost advantage of adjustable-speed pumped storage unit for daily operation in distributed hybrid system," Renewable Energy, Elsevier, vol. 176(C), pages 1-10.
    6. Xinfeng Ge & Jing Zhang & Jian Zhang & Demin Liu & Yuan Zheng & Huixiang Chen, 2022. "Review of Research on the Three-Dimensional Transition Process of Large-Scale Low-Lift Pump," Energies, MDPI, vol. 15(22), pages 1-34, November.
    7. Zheming Tong & Zhongqin Yang & Qing Huang & Qiang Yao, 2022. "Numerical Modeling of the Hydrodynamic Performance of Slanted Axial-Flow Urban Drainage Pumps at Shut-Off Condition," Energies, MDPI, vol. 15(5), pages 1-17, March.
    8. Shi, Lijian & Yuan, Yao & Jiao, Haifeng & Tang, Fangping & Cheng, Li & Yang, Fan & Jin, Yan & Zhu, Jun, 2021. "Numerical investigation and experiment on pressure pulsation characteristics in a full tubular pump," Renewable Energy, Elsevier, vol. 163(C), pages 987-1000.
    9. Zhang, Lijun & Gu, Jiawei & Zhu, Huaibao & Hu, Kuoliang & Li, Xiang & Jiao, Liuyang & Miao, Junjie & Liu, Jing & Wang, Zhiwei, 2021. "Rationality research of the adjustment law for the blade pitch angle of H-type vertical-axis wind turbines," Renewable Energy, Elsevier, vol. 167(C), pages 484-496.

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