A Simulation Calculation Method of a Water Hammer with Multpoint Collapsing

Li Zhao, Yusi Yang, Tong Wang, Liang Zhou, Yong Li and Miao Zhang
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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

Energies, 2020, vol. 13, issue 5, 1-16

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.

Keywords: water hammer with multipoint collapsing; wave velocity of water hammer; collapsing cavity model; validation experiment (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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