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A Simulation Calculation Method of a Water Hammer with Multpoint Collapsing

Author

Listed:
  • Li Zhao

    (School of Energy and Architecture, Xi’an Aeronautical University, Xi’an 710077, China)

  • Yusi Yang

    (School of Architecture and Engineering, Key Laboratory of Water Supply and Drainage, Ministry of Housing and Urban-Rural Development, Chang’an University, Xi’an 710054, China)

  • Tong Wang

    (School of Architecture and Engineering, Key Laboratory of Water Supply and Drainage, Ministry of Housing and Urban-Rural Development, Chang’an University, Xi’an 710054, China)

  • Liang Zhou

    (School of Energy and Architecture, Xi’an Aeronautical University, Xi’an 710077, China)

  • Yong Li

    (School of Architecture and Engineering, Key Laboratory of Water Supply and Drainage, Ministry of Housing and Urban-Rural Development, Chang’an University, Xi’an 710054, China)

  • Miao Zhang

    (School of Architecture and Engineering, Key Laboratory of Water Supply and Drainage, Ministry of Housing and Urban-Rural Development, Chang’an University, Xi’an 710054, China)

Abstract

The traditional discrete vapor cavity model (DVCM) is widely used in water hammer simulation. Water column separation in pipelines is usually predicted with this model. Nevertheless, the main weaknesses of this model consist of numerical instability and nonconvergence. Regarding the weaknesses of the traditional model, this paper discusses an improved method. The new method uses a new water hammer velocity formula, a new cavity model, and a floating grid method. Through simulations to test the effects of the new model, an experimental platform can be established to realize a water hammer with multipoint collapsing. The numerical simulation was programmed in C++ and the test was carried out with an actual pipeline model built in the laboratory. After certain modelling and calibration, the parameters in the simulation calculation were consistent with the measured parameters in the test. The numerical simulation results were compared with the experimental results. For the hydraulic transient system with multipoint collapsing, the superposition effect of the wave crest of the pseudo-water hammer in the traditional calculation model was obvious. The pressure of the water hammer in the simulation calculation was significantly higher than the actual value and the convergence effect of the water hammer wave was not good. Compared with the results of the traditional model, the simulation results of the new model were closer to the measured values. Therefore, the new model has better numerical solution accuracy, stability, and convergence, which is worth further study and promotion.

Suggested Citation

  • Li Zhao & Yusi Yang & Tong Wang & Liang Zhou & Yong Li & Miao Zhang, 2020. "A Simulation Calculation Method of a Water Hammer with Multpoint Collapsing," Energies, MDPI, vol. 13(5), pages 1-16, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1103-:d:327255
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    Citations

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    Cited by:

    1. Kamil Urbanowicz & Anton Bergant & Apoloniusz Kodura & Michał Kubrak & Agnieszka Malesińska & Paweł Bury & Michał Stosiak, 2021. "Modeling Transient Pipe Flow in Plastic Pipes with Modified Discrete Bubble Cavitation Model," Energies, MDPI, vol. 14(20), pages 1-22, October.
    2. Sorin-Ioan Lupa & Martin Gagnon & Sebastian Muntean & Georges Abdul-Nour, 2022. "The Impact of Water Hammer on Hydraulic Power Units," Energies, MDPI, vol. 15(4), pages 1-27, February.
    3. Lei Hou & Peibin Gong & Hai Sun & Lei Zhang & Jianhua Ren & Yiyan Cheng, 2024. "Emergency Pump-Rate Regulation to Mitigate Water-Hammer Effect—An Integrated Data-Driven Strategy and Case Studies," Energies, MDPI, vol. 17(5), pages 1-14, February.

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