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Dynamic stress of impeller blade of shaft extension tubular pump device based on bidirectional fluid-structure interaction

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Abstract

Current research on the stability of tubular pumps is mainly concerned with the transient hydrodynamic characteristics. However, the structural response under the influence of fluid-structure interaction hasn’t been taken fully into consideration. The instability of the structure can cause vibration and cracks, which may threaten the safety of the unit. We used bidirectional fluid-structure interaction to comprehensively analyze the dynamic stress characteristics of the impeller blades of the shaft extension tubular pump device. Furthermore, dynamic stress of impeller blade of shaft extension tubular pump device was solved under different lift conditions of 0° blade angle. Based on Reynolds-average N-S equation and SST k-ω turbulence model, numerical simulation was carried out for three-dimensional unsteady incompressible turbulent flow field of the pump device whole flow passage. Meanwhile, the finite element method was used to calculate dynamic characteristics of the blade structure. The blade dynamic stress distribution was obtained on the basis of fourth strength theory. The research results indicate that the maximum blade dynamic stress appears at the joint between root of inlet side of the blade suction surface and the axis. Considering the influence of gravity, the fluctuation of the blade dynamic stress increases initially and decreases afterwards within a rotation period. In the meantime, the dynamic stress in the middle part of inlet edge presents larger relative fluctuation amplitude. Finally, a prediction method for dynamic stress distribution of tubular pump considering fluid-structure interaction and gravity effect was proposed. This method can be used in the design stage of tubular pump to predict dynamic stress distribution of the structure under different operating conditions, improve the reliability of pump impeller and analyze the impeller fatigue life.

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Authors and Affiliations

  1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China

    Kan Kan & Huiwen Liu

  2. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Nanjing, 210098, China

    Yuan Zheng

  3. College of Energy and Electrical Engineering, Hohai University, Nanjing, 210098, China

    Yuan Zheng & Chunxia Yang

  4. Power China Huadong Engineering Corporation, Hangzhou, 311122, China

    Shifeng Fu & Xin Zhang

Authors
  1. Kan Kan
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  2. Yuan Zheng
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  3. Shifeng Fu
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  4. Huiwen Liu
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  5. Chunxia Yang
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  6. Xin Zhang
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Corresponding author

Correspondence to Yuan Zheng.

Additional information

Recommended by Associate Editor Cheolung Cheong

Kan Kan is currently a Ph.D. candidate at College of Water Conservancy and Hydropower Engineering, Hohai University, China. Mr. Kan has been working in Mechanical Engineering at University of Minnesota, Twin Cities, USA, as a Joint-Ph.D. student from 2016. His research interests include unsteady flow, fluid-structure interaction in turbomachinery.

Yuan Zheng received his Ph.D. from Hohai University in 2004. He is currently a Professor and Ph.D. candidate Supervisor at National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, China. His research interests include the theory, design and CFD of turbomachinery.

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Kan, K., Zheng, Y., Fu, S. et al. Dynamic stress of impeller blade of shaft extension tubular pump device based on bidirectional fluid-structure interaction. J Mech Sci Technol 31, 1561–1568 (2017). https://doi.org/10.1007/s12206-017-0303-1

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  • DOI: https://doi.org/10.1007/s12206-017-0303-1

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