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DDES analysis of the unsteady wake flow and its evolution of a centrifugal pump

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  • Zhang, Ning
  • Liu, Xiaokai
  • Gao, Bo
  • Xia, Bin

Abstract

In the present paper, to investigate the unsteady wake flow and its evolution at different moments when the blade sweeps the volute tongue, numerical simulation method is applied to discuss the flow field in detail based on the DDES (Delayed Detached Eddy Simulation) model when the model pump works at the nominal flow rate. Emphasis is attracted on the relative velocity distribution, besides the typical vorticity and TKE distributions at various moments are also analyzed to obtain the turbulent characteristics of the model pump. Results show that the current method has the ability to capture the main flow structure of the model pump, especially for the jet flow. From the blade pressure side to the suction side, the relative velocity distribution shows typical jet-wake flow pattern. With the impeller rotating, the reflection point of the jet-wake flow pattern changes at the mid span of the impeller. From flow distributions on different spans of the impeller, it is noted that the relative velocity decreases from the front chamber to the back chamber at major region of the blade channel. In the model pump, it is observed that several typical high vorticity regions are generated, where the high TKE values are also expected, especially at the blade trailing edge and in the volute zone caused by the wake flow. So it is inferred that for the unsteady flow in the pump and the corresponding induced pressure pulsation, controlling the wake flow is an effective approach to lower the unsteady flow pulsation in the centrifugal pump.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:141:y:2019:i:c:p:570-582
    DOI: 10.1016/j.renene.2019.04.023
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    References listed on IDEAS

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    1. Liu, Yabin & Tan, Lei, 2018. "Tip clearance on pressure fluctuation intensity and vortex characteristic of a mixed flow pump as turbine at pump mode," Renewable Energy, Elsevier, vol. 129(PA), pages 606-615.
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    Cited by:

    1. Dan Ni & Feifan Wang & Bo Gao & Yang Zhang & Shiyuan Huang, 2022. "Experimental Investigation on the Effect of the Staggered Impeller on the Unsteady Pressure Pulsations Characteristic in a Pump," Energies, MDPI, vol. 15(23), pages 1-15, November.
    2. 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).
    3. 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.
    4. Yuan, Zhiyi & Zhang, Yongxue & Zhang, Jinya & Zhu, Jianjun, 2021. "Experimental studies of unsteady cavitation at the tongue of a pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 177(C), pages 1265-1281.
    5. Yun Long & Mingyu Zhang & Zhen Zhou & Jinqing Zhong & Ce An & Yong Chen & Churui Wan & Rongsheng Zhu, 2023. "Research on Cavitation Wake Vortex Structures Near the Impeller Tip of a Water-Jet Pump," Energies, MDPI, vol. 16(4), pages 1-20, February.
    6. Ning Zhang & Delin Li & Bo Gao & Dan Ni & Zhong Li, 2022. "Unsteady Pressure Pulsations in Pumps—A Review," Energies, MDPI, vol. 16(1), pages 1-30, December.
    7. 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.
    8. Lin, Tong & Zhang, Jiajing & Wei, Bisheng & Zhu, Zuchao & Li, Xiaojun, 2024. "The role of bionic tubercle leading-edge in a centrifugal pump as turbines(PATs)," Renewable Energy, Elsevier, vol. 222(C).
    9. 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.
    10. 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.
    11. Chengshuo Wu & Jun Yang & Shuai Yang & Peng Wu & Bin Huang & Dazhuan Wu, 2023. "A Review of Fluid-Induced Excitations in Centrifugal Pumps," Mathematics, MDPI, vol. 11(4), pages 1-20, February.
    12. Zhenhua Zhou & Huacong Li & Jinbo Chen & Delin Li & Ning Zhang, 2023. "Numerical Simulation on Transient Pressure Pulsations and Complex Flow Structures of a Ultra-High-Speed Centrifugal Pump at Stalled Condition," Energies, MDPI, vol. 16(11), pages 1-17, June.

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