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Study on improvement of hydraulic performance and internal flow pattern of the axial flow pump by groove flow control technology

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  • Mu, Tong
  • Zhang, Rui
  • Xu, Hui
  • Zheng, Yuan
  • Fei, Zhaodan
  • Li, Jinghong

Abstract

When an axial flow pump operates at small flow rates, rotating stall may occur, which seriously restricts the pump performance and poses a great threat to the safe and stable operation of the whole system. The present work proposed a new groove flow control technology for the axial flow pump and studied its improvement effect and mechanism under stall conditions by numerical simulation. Results show that the groove flow control technology can significantly improve the hydraulic performance of the axial flow pump under stall conditions, with the pump head increment as high as 85.55% and the unstable region on the hydraulic performance curve was completely eliminated. In the inlet pipe region, it can effectively improve the bad flow state near the inlet of the impeller by increasing the axial velocity component and decreasing the velocity circulation dramatically. In the impeller region, the flow separation on the blade surface was improved and the cross-passage vortexes were suppressed, and the reasons were explained by analyzing the flow fields and pressure distributions in the representative grooves. In addition, compared with the diagonal groove (DG) scheme, the axial groove (AG) scheme showed better performance.

Suggested Citation

  • Mu, Tong & Zhang, Rui & Xu, Hui & Zheng, Yuan & Fei, Zhaodan & Li, Jinghong, 2020. "Study on improvement of hydraulic performance and internal flow pattern of the axial flow pump by groove flow control technology," Renewable Energy, Elsevier, vol. 160(C), pages 756-769.
    • Handle: RePEc:eee:renene:v:160:y:2020:i:c:p:756-769
    DOI: 10.1016/j.renene.2020.06.145
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    References listed on IDEAS

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    1. Lijian Shi & Jun Zhu & Fangping Tang & Chuan Wang, 2020. "Multi-Disciplinary Optimization Design of Axial-Flow Pump Impellers Based on the Approximation Model," Energies, MDPI, vol. 13(4), pages 1-19, February.
    2. Li, Deyou & Wang, Hongjie & Qin, Yonglin & Wei, Xianzhu & Qin, Daqing, 2018. "Numerical simulation of hysteresis characteristic in the hump region of a pump-turbine model," Renewable Energy, Elsevier, vol. 115(C), pages 433-447.
    3. 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.
    4. Shi, Lijian & Zhang, Wenpeng & Jiao, Haifeng & Tang, Fangping & Wang, Li & Sun, Dandan & Shi, Wei, 2020. "Numerical simulation and experimental study on the comparison of the hydraulic characteristics of an axial-flow pump and a full tubular pump," Renewable Energy, Elsevier, vol. 153(C), pages 1455-1464.
    5. Shi, Guangtai & Liu, Zongku & Xiao, Yexiang & Li, Helin & Liu, Xiaobing, 2020. "Tip leakage vortex trajectory and dynamics in a multiphase pump at off-design condition," Renewable Energy, Elsevier, vol. 150(C), pages 703-711.
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    Cited by:

    1. Yu, Zhi-Feng & Wang, Wen-Quan & Yan, Yan & Liu, Xing-Shun, 2021. "Energy loss evaluation in a Francis turbine under overall operating conditions using entropy production method," Renewable Energy, Elsevier, vol. 169(C), pages 982-999.
    2. Fan Yang & Zhongbin Li & Yao Yuan & Chao Liu & Yiqi Zhang & Yan Jin, 2021. "Numerical and Experimental Investigation of Internal Flow Characteristics and Pressure Fluctuation in Inlet Passage of Axial Flow Pump under Deflection Flow Conditions," Energies, MDPI, vol. 14(17), pages 1-22, August.
    3. S. Arunvinthan & V.S. Raatan & S. Nadaraja Pillai & Amjad A. Pasha & M. M. Rahman & Khalid A. Juhany, 2021. "Aerodynamic Characteristics of Shark Scale-Based Vortex Generators upon Symmetrical Airfoil," Energies, MDPI, vol. 14(7), pages 1-22, March.
    4. Mu, Tong & Zhang, Rui & Xu, Hui & Fei, Zhaodan & Feng, Jiangang & Jin, Yan & Zheng, Yuan, 2023. "Improvement of energy performance of the axial-flow pump by groove flow control technology based on the entropy theory," Energy, Elsevier, vol. 274(C).

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