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10.3390/w15173041
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Article

Investigation of Structural Strength and Fatigue Life of Rotor System of a Vertical Axial-Flow Pump under Full Operating Conditions

by
Haoyu Li
1,
Zhizhou Cai
2,
Yuan Zheng
1,
Jiangang Feng
3,
Hui Xu
3,4,
Huixiang Chen
3,4,
Maxime Binama
4,5 and
Kan Kan
1,4,*
1
College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
2
Shanghai Nuclear Engineering Research & Design Institute, Shanghai 200233, China
3
College of Agricultural Science and Engineering, Hohai University, Nanjing 211100, China
4
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
5
College of Science and Technology (MEE Department), University of Rwanda, Kigali 3900, Rwanda
*
Author to whom correspondence should be addressed.
Water 2023, 15(17), 3041; https://doi.org/10.3390/w15173041
Submission received: 27 June 2023 / Revised: 21 August 2023 / Accepted: 22 August 2023 / Published: 24 August 2023
(This article belongs to the Special Issue Advances in Hydrodynamics of Water Pump Station System)
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Abstract

Axial-flow pumps consider both the conventional pump mode and the pump as turbine (PAT) mode operation and put forward higher requirements for long-term operation stability and structural strength; therefore, it is of great engineering significance to evaluate the structural strength and fatigue life of the rotor under full operating conditions. In this study, based on computational fluid dynamics and the one-way fluid-structure interaction algorithm, the structural strength and fatigue life of the rotor system of a large vertical axial-flow pump under full operating conditions were evaluated and studied. The results show that blade deformation and equivalent stress are generally higher in the PAT mode than in the pump mode. The maximum deformation in both modes occurs at the tip of the blade, while the area of stress concentration is at the root of the blade. Both the deformation and the equivalent stress increase with increasing flow rate. The minimum safety factor occurs at the blade root in both modes, and the safety factor in the PAT mode is relatively smaller than that in pump mode. Therefore, when designing and manufacturing axial flow pumps for turbine duties, priority should be given to material strength at the blade root during PAT mode operation to ensure safe and stable operation. The aim of this study is to provide technical references and theoretical foundations for evaluating the service cycle of axial-flow pumps and the influence on pump life under different operation modes.
Keywords: axial-flow pump; rotor system; structural strength; fatigue life; pump as turbine; fluid-structure interaction axial-flow pump; rotor system; structural strength; fatigue life; pump as turbine; fluid-structure interaction

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MDPI and ACS Style

Li, H.; Cai, Z.; Zheng, Y.; Feng, J.; Xu, H.; Chen, H.; Binama, M.; Kan, K. Investigation of Structural Strength and Fatigue Life of Rotor System of a Vertical Axial-Flow Pump under Full Operating Conditions. Water 2023, 15, 3041. https://doi.org/10.3390/w15173041

AMA Style

Li H, Cai Z, Zheng Y, Feng J, Xu H, Chen H, Binama M, Kan K. Investigation of Structural Strength and Fatigue Life of Rotor System of a Vertical Axial-Flow Pump under Full Operating Conditions. Water. 2023; 15(17):3041. https://doi.org/10.3390/w15173041

Chicago/Turabian Style

Li, Haoyu, Zhizhou Cai, Yuan Zheng, Jiangang Feng, Hui Xu, Huixiang Chen, Maxime Binama, and Kan Kan. 2023. "Investigation of Structural Strength and Fatigue Life of Rotor System of a Vertical Axial-Flow Pump under Full Operating Conditions" Water 15, no. 17: 3041. https://doi.org/10.3390/w15173041

APA Style

Li, H., Cai, Z., Zheng, Y., Feng, J., Xu, H., Chen, H., Binama, M., & Kan, K. (2023). Investigation of Structural Strength and Fatigue Life of Rotor System of a Vertical Axial-Flow Pump under Full Operating Conditions. Water, 15(17), 3041. https://doi.org/10.3390/w15173041

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