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Study on the influence of the specific area of balance hole on cavitation performance of high- speed centrifugal pump

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Abstract

In this paper, the influence of the specific area of balancing hole on the cavitation performance of high-speed centrifugal pump is studied by numerical method. The results show that in the initial cavitation stage, with the increase of the specific area, the head and efficiency of the pump decreases, and the shaft power increases in a small range. The specific area of the balance hole can change the magnitude and direction of the rotor axial force. With the increase of the specific area, the anti-cavitation performance of the pump is weakened, especially when the specific area reaches a certain value, the vortex flow appears in the balance hole, which causes serious distortion of the flow condition at the inlet of the centrifugal impeller. Meanwhile, cavitation also occurs in the balance chamber and is mainly concentrated near the hub of the centrifugal impeller.

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Abbreviations

Q :

Flow rate (m3/h)

k :

Specific area of the balance hole

H :

Head (m)

η :

Efficiency (%)

P :

Shaft power (kW)

F :

Rotor axial force (N)

p in :

Pressure of pump inlet

p v :

Pressure of fluid vaporization

σ :

Cavitation number

σ 0 :

Cavitation number of pump with slight cavitation

σ 3 % :

Critical cavitation number of pump

σ10 % :

Cavitation number of pump with serious cavitation

q :

Leakage of balancing hole

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Acknowledgments

This work is financially supported by the National Natural Science Foundation of China (Project No. 51469013).

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Authors and Affiliations

  1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, China

    Xiaorui Cheng, Zhengbai Chang & Yimeng Jiang

  2. Key Laboratory of Fluid machinery and Systems, Lanzhou, China

    Xiaorui Cheng

Authors
  1. Xiaorui Cheng
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  2. Zhengbai Chang
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  3. Yimeng Jiang
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Corresponding author

Correspondence to Xiaorui Cheng.

Additional information

Recommended by Editor Yang Na

Xiaorui Cheng is a Professor in the College of Energy and Power Engineering, Lanzhou University of Technology. He obtained a Ph.D. His research interests include analysis and optimization of internal flow of hydraulic machinery.

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Cheng, X., Chang, Z. & Jiang, Y. Study on the influence of the specific area of balance hole on cavitation performance of high- speed centrifugal pump. J Mech Sci Technol 34, 3325–3334 (2020). https://doi.org/10.1007/s12206-020-0725-z

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  • DOI: https://doi.org/10.1007/s12206-020-0725-z

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