Flow-inducedresonance analysis of valve stem for LNG ultra-low temperature control valve

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (3) : 218-225.

WANG Weibo1, 2, HAO Jiaoshan1, 2, LIU Baiqi2, YANG Henghu2, LI Shuxun3

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Abstract

Aiming at the problem of flow-induced resonance of valve stem under small opening of an ultra-low temperature control valve in LNG terminal, models under 5%, 10%, 20%, 30% and 50% openings, respectively of DN200-Class600 LNG ultra-low temperature control valve were taken as study objects. The software Fluent was used to do transient flow field analysis of each model, and monitor fluid pressure fluctuation time-domain information on the fluid-solid coupled surface of valve plug and valve stem assembly. The software Tecplot was used to do fast Fourier transformation (FFT) of the monitored information, and obtain exciting force frequencies exerted on valve stem by fluid. In addition，the fluid-solid coupled modal analysis of each model was performed with the software ANSYS Workbench to obtain fluid-solid coupled modal shapes and modal frequencies of valve plug and valve stem assembly. The flow-induced resonance of the valve stem under each opening was studied deeply by comparing the two kinds of frequencies. The results showed that pressure fluctuation peak value frequencies on valve plug and stem assembly under each opening of the control valve are all within the range of less than 60Hz; their various fluid-solid coupled modal frequencies are larger than 120 Hz; pressure fluctuation frequency avoids natural frequency, and valve stem does not produce flow-induced resonance.

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ultra-low temperature control valve / transient flow field / fluid-structure interaction / modal analysis / flow-induced resonance of valve stem

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WANG Weibo1, 2, HAO Jiaoshan1, 2, LIU Baiqi2, YANG Henghu2, LI Shuxun3. Flow-inducedresonance analysis of valve stem for LNG ultra-low temperature control valve[J]. Journal of Vibration and Shock, 2021, 40(3): 218-225

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