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Numerical analysis of the vortical structure and its unsteady evolution of a centrifugal pump

Author

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  • Zhang, Ning
  • Jiang, Junxian
  • Gao, Bo
  • Liu, Xiaokai
  • Ni, Dan

Abstract

To investigate the complex flow and vortical structure of a centrifugal pump with low specific speed, the numerical simulation approach DDES is used to capture the unsteady flow fields when the blade periodically sweeps the volute tongue. Attentions are attracted on unsteady vortical structures on the mid-span of the model pump, and quantitative data of z-vorticity(axial component of vorticity) at the impeller exit are extracted to discuss the corresponding evolution process. Besides, three dimensional vortices within the impeller are also identified at different working conditions. Results show that at the nominal and high working conditions, evident vorticity sheets are generated within the pump. High vorticity sheets are developed on the blade suction side and the trailing edge, which are also significant in the volute area caused by the vortex shedding from the impeller. The interactions between the shed wake flow and the tongue are not identical at various working conditions, and it is more evident at high working condition. With the blade moving away from the tongue, high vorticity is generated around the blade suction side. Especially at high working condition, several vorticity sheets with alternative negative and positive values are formed near the blade suction side. The vorticity sheet tends to stretch towards the blade pressure side with the impeller passing the tongue. Based on the 3D vortical structures, it is found that the hairpin vortices are generated within the blade channels, which could not be captured at low working condition. Finally, the obtained vorticity sheet and 3D vortex results will contribute to the understanding of the complex flow structures in pumps.

Suggested Citation

  • Zhang, Ning & Jiang, Junxian & Gao, Bo & Liu, Xiaokai & Ni, Dan, 2020. "Numerical analysis of the vortical structure and its unsteady evolution of a centrifugal pump," Renewable Energy, Elsevier, vol. 155(C), pages 748-760.
    • Handle: RePEc:eee:renene:v:155:y:2020:i:c:p:748-760
    DOI: 10.1016/j.renene.2020.03.182
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    References listed on IDEAS

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    1. Zhang, Ning & Liu, Xiaokai & Gao, Bo & Xia, Bin, 2019. "DDES analysis of the unsteady wake flow and its evolution of a centrifugal pump," Renewable Energy, Elsevier, vol. 141(C), pages 570-582.
    2. Zhang, Ning & Jiang, Junxian & Gao, Bo & Liu, Xiaokai, 2020. "DDES analysis of unsteady flow evolution and pressure pulsation at off-design condition of a centrifugal pump," Renewable Energy, Elsevier, vol. 153(C), pages 193-204.
    3. Arun Shankar, Vishnu Kalaiselvan & Umashankar, Subramaniam & Paramasivam, Shanmugam & Hanigovszki, Norbert, 2016. "A comprehensive review on energy efficiency enhancement initiatives in centrifugal pumping system," Applied Energy, Elsevier, vol. 181(C), pages 495-513.
    4. Ni, Dan & Zhang, Ning & Gao, Bo & Li, Zhong & Yang, Minguan, 2020. "Dynamic measurements on unsteady pressure pulsations and flow distributions in a nuclear reactor coolant pump," Energy, Elsevier, vol. 198(C).
    5. Wang, Chuan & Shi, Weidong & Wang, Xikun & Jiang, Xiaoping & Yang, Yang & Li, Wei & Zhou, Ling, 2017. "Optimal design of multistage centrifugal pump based on the combined energy loss model and computational fluid dynamics," Applied Energy, Elsevier, vol. 187(C), pages 10-26.
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    Cited by:

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    2. Ziyi Mei & Bo Gao & Ning Zhang & Yuanqing Lai & Guoping Li, 2022. "Numerical Study on the Unsteady Flow Field Characteristics of a Podded Propulsor Based on DDES Method," Energies, MDPI, vol. 15(23), pages 1-25, December.
    3. Cao, Puyu & Zhu, Rui & Yin, Gang, 2021. "Spike-type disturbances due to inlet distortion in a centrifugal pump," Renewable Energy, Elsevier, vol. 165(P1), pages 288-300.
    4. Jian-Cheng Cai & Hao-Jie Chen & Volodymyr Brazhenko & Yi-Hong Gu, 2021. "Study of the Hydrodynamic Unsteady Flow Inside a Centrifugal Fan and Its Downstream Pipe Using Detached Eddy Simulation," Sustainability, MDPI, vol. 13(9), pages 1-19, May.
    5. Su, Wen-Tao & Binama, Maxime & Li, Yang & Zhao, Yue, 2020. "Study on the method of reducing the pressure fluctuation of hydraulic turbine by optimizing the draft tube pressure distribution," Renewable Energy, Elsevier, vol. 162(C), pages 550-560.
    6. Ning Zhang & Delin Li & Junxian Jiang & Bo Gao & Dan Ni & Anthony Akurugo Alubokin & Wenbin Zhang, 2023. "Experimental Investigation on Velocity Fluctuation in a Vaned Diffuser Centrifugal Pump Measured by Laser Doppler Anemometry," Energies, MDPI, vol. 16(7), pages 1-17, April.

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