The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
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Influence of Large Change of Specific Speed on the Performance of Very Low Specific Speed Centrifugal Pump

비속도의 큰 변화가 극저비속도 원심펌프의 성능에 미치는 영향

  • Published : 2006.02.01
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Abstract

Efficiency of a centrifugal pump is known to drop rapidly with a decrease of specific speed $n_s$. However, below $n_s=60\;[min^{-1},\;m^3/min,\;m]$, the pump characteristics are not yet clear. Therefore, present study is aimed to investigate the influence of large change of specific speed on the performance of a very low specific speed centrifugal pump. Moreover, influence of impeller configuration on the performance of very low specific speed pump is investigated. The results show that very low specific speed can be accomplished by reducing volute throat sectional area using circular spacer. Influence of the spacer's location and configuration in the discharge passage on the pump performance is very small. Best efficiency of very low specific speed centrifugal pump decreases proportionally to the specific speed but the best efficiency decreases on a large scale in the range of $n_s<40$. Influence of impeller configuration on the pump performance and radial thrust of centrifugal pump are considerably small in the range of extremely low specific speed $(n_s=25)$.

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References

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  1. Numerical Study on Cavitation Performance Evaluation in a Centrifugal Pump Impeller vol.36, pp.2, 2012, https://doi.org/10.5916/jkosme.2012.36.2.286