Fluid-Structure Coupling Modelling and Dynamic Analysis of a Direct-Acting Relief Valve

doi:10.3901/JME.2021.23.137

Abstract

Abstract: Direct-acting relief valve is widely applied in the energy supply of underwater power equipment; however, its dynamic stability is generally challenged by the change of the water depth, namely the hydraulic pressure condition. Sudden pressure jumps are observed at valve port in certain depths, which brings harmful influences on its normal working condition. A two degree-of-freedom dynamic model for a direct-acting relief valve is developed based on fluid-structure coupling analysis, and then its corresponding nondimensional mathematical model is solved numerically. The results of numerical simulations are in agreements with the experimental measurements for the water depths of impulse vibrations of the relief valve. Moreover, the variations of both the axial and longitudinal vibrations of the valve element as the water depth, and the coexistence of its multi-stability conditions in certain depths are analysed. The nonlinear characteristics of the developed model provide a theoretical explanation for the pressure fluctuation characteristics explored in the experimental measurements, which further supports the system optimization to avoid large amplitude vibrations of the relief valve.

Key words: relief valve, fluid-structure coupling, dynamic modelling, dynamic analysis

CLC Number:

TG156

LIAO Maolin, SONG Wen, WANG Xiaoyong, XIN Yanli, GAO Zhiying. Fluid-Structure Coupling Modelling and Dynamic Analysis of a Direct-Acting Relief Valve[J]. Journal of Mechanical Engineering, 2021, 57(23): 137-148.

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