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Effect of impeller reflux balance holes on pressure and axial force of centrifugal pump

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Abstract

The size of impeller reflux holes for centrifugal pump has influence on the pressure distribution of front and rear shrouds and rear pump chamber, as well as energy characteristics of whole pump and axial force. Low specific-speed centrifugal pump with Q=12.5 m3/h, H=60 m, n=2950 r/min was selected to be designed with eight axial reflux balance holes with 4.5 mm in diameter. The simulated Q-H curve and net positive suction head (NPSH) were in good agreement with experimental results, which illustrated that centrifugal pump with axial reflux balance holes was superior in the cavitation characteristic; however, it showed to little superiority in head and efficiency. The pressure in rear pump chamber at 0.6 times rate flow is 29.36% of pressure difference between outlet and inlet, which reduces to 29.10% at rate flow and 28.33% at 1.4 times rate flow. As the whole, the pressure distribution on front and rear shrouds from simulation results is not a standard parabola, and axial force decreases as flow rate increases. Radical reflux balance holes chosen to be 5.2 mm and 5.9 mm in diameter were further designed with other hydraulic parts unchanged. With structural grids adopted for total flow field, contrast numerical simulation on internal flow characteristics was conducted based on momentum equations and standard turbulence model (κ-ɛ). It is found that axial force of pump with radical reflux balance holes of 5.2 mm and 5.9 mm in diameter is significantly less than that with radical reflux balance holes of 4.5 mm in diameter. Better axial force balance is obtained as the ratio of area of reflux balance holes and area of sealing ring exceeds 6.

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Authors and Affiliations

  1. Technical and Research Center of Fluid Machinery Engineering, Jiangsu University, Zhenjiang, 212013, China

    Wei-dong Cao  (曹卫东), Xun Dai  (代珣) & Qi-xiang Hu  (胡啟祥)

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  1. Wei-dong Cao  (曹卫东)
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  2. Xun Dai  (代珣)
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  3. Qi-xiang Hu  (胡啟祥)
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Corresponding author

Correspondence to Wei-dong Cao  (曹卫东).

Additional information

Foundation item: Project(51179075) supported by the National Natural Science Foundation of China; Project(BK20131256) supported by the Natural Science Funds of Jiangsu Province, China; Project supported by the Priority Academic Program Development of Jiangsu High Education Institutions, China

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Cao, Wd., Dai, X. & Hu, Qx. Effect of impeller reflux balance holes on pressure and axial force of centrifugal pump. J. Cent. South Univ. 22, 1695–1706 (2015). https://doi.org/10.1007/s11771-015-2688-2

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  • DOI: https://doi.org/10.1007/s11771-015-2688-2

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