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Article

Unsteady Cavitation Analysis of the Centrifugal Pump Based on Entropy Production and Pressure Fluctuation †

by
Qiaorui Si
1,
Fanjie Deng
1,
Yu Lu
1,
Minquan Liao
2 and
Shouqi Yuan
1,*
1
National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
2
Gansu Water Conservancy and Hydropower Survey Design and Research Institute Co., Ltd., Lanzhou 730000, China
*
Author to whom correspondence should be addressed.
†
This manuscript is an extended version of our paper published in the Proceedings of the 15th European Turbomachinery Conference, Budapest, Hungary, 24–28 April 2023. ETC15: paper n. 254.
Int. J. Turbomach. Propuls. Power 2023, 8(4), 46; https://doi.org/10.3390/ijtpp8040046
Submission received: 6 June 2023 / Revised: 18 October 2023 / Accepted: 24 October 2023 / Published: 11 November 2023
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Abstract

A numerical method using combined detached-eddy simulation (DES) and a cavitation model considering the rotation effect is used for unsteady cavitation flow field of the centrifugal pump. A closed-type pump test system was established to obtain the pump performance and pressure pulsation characteristics under different flow rates and cavitation condition, which provide boundary conditions and verification of calculations. Based on the calculation results of the unsteady flow field of the centrifugal pump cavitation, the entropy generation analysis of the flow field and an analysis of the pressure fluctuation characteristics were carried out. Then, we tried to reveal the relationship between cavitation and the deterioration of the centrifugal pump performance and the generation of the unstable operation excitation force. The internal energy loss is mainly concentrated in the impeller, volute, and pump cavity area, which accounts for more than 85% of the total entropy generation. The characteristic frequency of a Strouhal number of about 0.333 appears at the volute tongue due to the cavitation flow spread downstream.
Keywords: centrifugal pumps; cavitation; entropy; hydrodynamics characteristics; pressure fluctuation centrifugal pumps; cavitation; entropy; hydrodynamics characteristics; pressure fluctuation

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MDPI and ACS Style

Si, Q.; Deng, F.; Lu, Y.; Liao, M.; Yuan, S. Unsteady Cavitation Analysis of the Centrifugal Pump Based on Entropy Production and Pressure Fluctuation. Int. J. Turbomach. Propuls. Power 2023, 8, 46. https://doi.org/10.3390/ijtpp8040046

AMA Style

Si Q, Deng F, Lu Y, Liao M, Yuan S. Unsteady Cavitation Analysis of the Centrifugal Pump Based on Entropy Production and Pressure Fluctuation. International Journal of Turbomachinery, Propulsion and Power. 2023; 8(4):46. https://doi.org/10.3390/ijtpp8040046

Chicago/Turabian Style

Si, Qiaorui, Fanjie Deng, Yu Lu, Minquan Liao, and Shouqi Yuan. 2023. "Unsteady Cavitation Analysis of the Centrifugal Pump Based on Entropy Production and Pressure Fluctuation" International Journal of Turbomachinery, Propulsion and Power 8, no. 4: 46. https://doi.org/10.3390/ijtpp8040046

APA Style

Si, Q., Deng, F., Lu, Y., Liao, M., & Yuan, S. (2023). Unsteady Cavitation Analysis of the Centrifugal Pump Based on Entropy Production and Pressure Fluctuation. International Journal of Turbomachinery, Propulsion and Power, 8(4), 46. https://doi.org/10.3390/ijtpp8040046

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