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Numerical study on transient hydraulic excitation force characteristics of a water jet mixed-flow pump during rapid startup period

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Abstract

Mixed-flow pumps have been widely used in water jet propulsion field. To ensure reliability and operation efficiency, it is necessary to investigate the characteristics of hydraulic excitation force during transient operations. In this paper, the radial force of a water jet mixed-flow pump during rapid startup period was investigated numerically based on improved delayed detached eddy simulation (IDDES) and siding mesh method, the external characteristics were verified by test results. The spatial-temporal evolution of radial force was analyzed. The radial force during rapid startup presents transient and delay phenomenon, which shows disparity compared with quasi-steady state. The flow analysis and blade strip analysis show inlet recirculation significantly affects the radial force’s evolution, the radial force is quite different from blade root to tip and the blade tip contributes most to the radial force delay phenomenon. By applying boundary vorticity flux (BVF) theory and separation vortex formation diagnosis, separation regions caused by the dissipation of inlet recirculation were effectively identified and the change trend is in line with the change of radial force, which explains how inlet recirculation results the delay of radial force on blade tip strip and the whole impeller blade.

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Abbreviations

n :

Rotational speed

Q d :

Design flow rate

H d :

Design head

δ :

Shroud tip clearance

d 1 :

Impeller suction diameter

d 2 :

Mean diameter of impeller outlet

b 2 :

Width of impeller outlet

ρ :

Water density

F r :

Radial force

u 2 :

Outlet velocity of impeller

σ :

Boundary vorticity flux

ω :

Vorticity

T sf :

Skin-friction

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Acknowledgments

The work was financially supported by the National Natural Science Foundation of China (Grant No. 51839010), Pioneer and Leading Goose R&D Program of Zhejiang (No. 2022C01047) and the Project of Bureau of Science and Technology of Zhoushan (No.2022C81005).

Author information

Authors and Affiliations

  1. College of Energy Engineering, Zhejiang University, Hangzhou, 310058, China

    Guitao Zeng, Juanhong Li, Peng Wu & Dazhuan Wu

  2. Kunming Precision Machinery Research Institute, Kunming, 650032, China

    Weibin Chen

  3. Zhejiang Key Laboratory of Clean Energy and Carbon Neutrality, Jiaxing, 314000, China

    Peng Wu & Dazhuan Wu

  4. Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, 316021, China

    Bin Huang

  5. The Engineering Research Center of Oceanic Sensing Technology and Equipment, Ministry of Education, Zhejiang University, Hangzhou, China

    Bin Huang

Authors
  1. Guitao Zeng
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  2. Weibin Chen
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  3. Juanhong Li
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  4. Peng Wu
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  5. Bin Huang
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  6. Dazhuan Wu
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Corresponding author

Correspondence to Peng Wu.

Additional information

Guitao Zeng is currently a Ph.D. candidate in the Institute of Process Equipment, College of Energy Engineering, Zhejiang University. He received his B.S. degree in 2018 from Zhejiang University. His research interests include signal, vibration, cavitation, fluid mechanism, fluid machinery design and optimization.

Peng Wu is currently an Associate Professor in the Institute of Process Equipment of Zhejiang University (China). He obtained his B.Sc. degree in 2008 and his Ph.D. in 2013 from Zhejiang University (China). His major research interests include optimal design, transient flow and vibration in fluid machinery.

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Zeng, G., Chen, W., Li, J. et al. Numerical study on transient hydraulic excitation force characteristics of a water jet mixed-flow pump during rapid startup period. J Mech Sci Technol 37, 5117–5132 (2023). https://doi.org/10.1007/s12206-023-0916-5

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  • DOI: https://doi.org/10.1007/s12206-023-0916-5

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