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2 Journal of Theoretical and Applied Mechanics

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w słowach kluczowych: reservoir-pipe-valve system (RPV system)

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Effects of a water hammer and cavitation on vibration transients in a reservoir-pipe-valve system

Miao Yang, Qiu Zaihui, Zhang Xiaolu, Jiang Yuncheng, Pan Jun, Liu Yi, Zhang Li, Li Kun

Journal of Theoretical and Applied Mechanics

2021

Vol. 59 nr 4

611--622

An extraordinary phenomenon with violent oscillation, accompanied by an abnormal “click” sound is observed during the valve closing in a fuel feeding pipe system. A fluctuation model with flow cavitation, in which time-varying stiffness, time-varying damping coefficients and flow cavitation are comprehensively considered, is proposed. On this basis, a dynamic vibration equation is established and an expression of flow pressure at the valve port is derived. The critical displacement of the flow cavitation system is defined. When the vibration amplitude reaches the critical displacement, cavitation occurs. Based on this model, simulation of vibration displacement and flow pressure is given. The simulated transient process shows the phenomena of vibration fluctuation with cavitation. The results are compared with the experimental data measured by a pressure sensor. Under our experimental conditions, the critical displacement of vibration is 1.41mm, and the average relative pressure peak error is 0.022. The comparison between the simulation and experimental results shows that they are in an acceptable agreement.

Vibration transients of reservoir-pipe-valve system caused by water hammer

Miao Yang, Jiang Yuncheng, Qiu Zaihui, Pan Jun, Wang Lu, Han Zhenrong, Li Kun, Zhang Li, Zhang Xiaolu

Journal of Theoretical and Applied Mechanics

2020

Vol. 58 nr 4

1037--1048

A severe oscillation, accompanied with an abnormal “click” sound, of a fuel feeding pipe system during valve closing, when the feeding flowrate reaches a certain value, is observed experimentally. A fluctuation model in which stiffness and damping coefficients of the vibration system are time varying is proposed. Each coefficient is composed of two parts, one of which is constant and the other is time varying. Based on this model, simulation transients of the vibration displacement, velocity and pressure in the pipe are presented. Simulations of the pressure transients are compared with experimental data detected by pressure transducer, which shows that both have fluctuations in the transient process at a large flowrate.