Since 1963
ARTICLE
Effects of a water hammer and cavitation on vibration transients in a reservoir-pipe-valve system
1
Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China
2
Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing, China
3
Nanjing Electromechanical Hydraulic Engineering Center
4
China Nuclear Power Technology Research Institute Co., Ltd.
Submission date: 2021-03-06
Final revision date: 2021-06-20
Acceptance date: 2021-06-22
Online publication date: 2021-10-07
Publication date: 2021-10-20
Corresponding author
Kun Li
China Nuclear Power Technology Research Institute Co. Ltd., China General Nuclear Power Corporation, China
China Nuclear Power Technology Research Institute Co. Ltd., China General Nuclear Power Corporation, China
Journal of Theoretical and Applied Mechanics 2021;59(4):611-622
KEYWORDS
TOPICS
ABSTRACT
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.
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