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DDES analysis of unsteady flow evolution and pressure pulsation at off-design condition of a centrifugal pump

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

Abstract

In the present paper, to investigate unsteady flow structures and pressure pulsations at off-design conditions, a low specific speed centrifugal pump is investigated by the DDES (Delayed Detached Eddy Simulation) method. Emphasis is laid on the unsteady evolution of flow structure and pressure pulsation at the stalled condition. Results show that the jet-wake flow pattern could be captured by the current numerical simulation method, and it shows a high calculation precision for the jet flow. Relative velocity decreases rapidly in the wake region towards the blade suction side. Significant inflection point exists between the jet and wake flow regions, and it almost keeps unchanged at the identical impeller-volute position under various flow rates. At the stalled status, the inflection point moves towards the blade pressure side with the blade passing the volute tongue, and evident non-uniform flow distributions are formed in the blade channels characterized by the multiple vortices. The blade channel is gradually blocked by the corresponding stall cell when the blade approaches the volute tongue, and it indicates that the volute tongue has a significant effect on the evolution process of the stall structure. By combination analysis of the unsteady evolution of the stall structure and pressure spectrum, the stall frequency at 0.25fn (being fn the impeller rotating frequency) is captured for the current model pump.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:153:y:2020:i:c:p:193-204
    DOI: 10.1016/j.renene.2020.02.015
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    References listed on IDEAS

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    3. 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.
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    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. 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.
    7. 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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