Numerical Investigation of Flow Structure and Performance of Centrifugal Pump with Cavitation

Document Type : Research Article

Authors

1 assistant professor, Arak university of technology

2 Arak university of technology

Abstract

In the present paper, the numerical simulation of the flow to identify the cavitation and its effects inside the centrifugal pump of 100-250 type of Pumpiran Company, including the impeller and volute of the pump, has been done. The Rayleigh–Plesset equation was employed to study the growth and collapse of the vapor bubble. In order to validate the numerical results, the pump curves were extracted from the present study and compared with similar experimental. The deviation of the present numerical results with the experimental ones in the pump design flow rate is 6.5%. It is found that cavitation occurs at inlet pressures of less than 45 kPa. By reducing the inlet pressure from 40 kPa to 20 kPa, the flow separation rate also increases and its position is transferred from the beginning of the blade to the inner areas of the blade. The position of cavitation occurs at 0.14 to 0.24 of the passage as well as at the beginning of the blades. The volume fraction of steam in these parts has increased from 0.04 to 0.96, respectively. With cavitation in the net positive suction head equal to 1.52, a 3% drop of the head is observed in the diagrams.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 54, Issue 1
April 2022
Pages 55-74

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