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Unsteady Study on the Influence of the Angle of Attack of the Blade on the Stall of the Impeller of the Double-Suction Centrifugal Pump

Author

Listed:
  • Hao Wang

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China)

  • Yibin Li

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
    Innovation Research Center for Advanced Equipment of Nuclear Class Pumps, Lanzhou University of Technology, Lanzhou 730050, China)

  • Yunshan Kong

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China)

  • Shengfu Zhang

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China)

  • Teng Niu

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China)

Abstract

In order to clearly show the influence on the rotating stall of the impeller of a double-suction centrifugal pump, this paper, using the numerical simulation method of Shear Stress Transform (SST), analyzes the effects of different inlet angles of the blade on hydraulic performance, internal flow field and pressure pulsation in the impeller. The results show that the small angle of attack of the blade inlet scheme can effectively suppress the impeller rotation stall and that the design point head and efficiency are increased by 6.4% and 5.7% respectively. This paper, using turbulence intensity to determine the generation of rotating stall, proposed that the average of turbulence intensity exceeding 2% is a necessary condition for the generation of rotating stall and discovered that the standard deviation of the big angle of attack of the scheme is always greater than that of the small angle being analyzed by the impeller pressure pulsation. The basic critical frequencies of blade inlet pressure pulsation with components of a low frequency is dominated by the impeller rotating frequency F 0 and its harmonic frequencies 2F 0 , and 3F 0 , but the basic critical frequencies of blade outlet pressure pulsation is governed by Blade Passing Frequency (BPF). The research results can provide some theoretical support for stall research and hydraulic performance optimization of a double-suction pump.

Suggested Citation

  • Hao Wang & Yibin Li & Yunshan Kong & Shengfu Zhang & Teng Niu, 2022. "Unsteady Study on the Influence of the Angle of Attack of the Blade on the Stall of the Impeller of the Double-Suction Centrifugal Pump," Energies, MDPI, vol. 15(24), pages 1-21, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9528-:d:1004730
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    References listed on IDEAS

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    1. Wang, Zhiyuan & Qian, Zhongdong & Lu, Jie & Wu, Pengfei, 2019. "Effects of flow rate and rotational speed on pressure fluctuations in a double-suction centrifugal pump," Energy, Elsevier, vol. 170(C), pages 212-227.
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    Cited by:

    1. Zhang, Jiahua & Wang, Haoyuan & Yan, Qingdong & Khoo, Boo Cheong & Liu, Cheng & Guo, Meng & Wei, Wei, 2024. "Effect of blade length on unsteady cavitation characteristics of hydrodynamic torque converter," Energy, Elsevier, vol. 307(C).

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