Flow field characteristics for slug leakage in a gas-liquid mixed pipeline

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (12) : 194-202.

FANG Liping1,2,LI Yuxing2,LIANG Jinlu1,ZHOU Xiong1

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Abstract

Gas-liquid mixed transportation is a common technology for oil and gas pipeline transportation. Compared with gas/liquid single-phase pipeline, when a gas-liquid mixed pipeline leaks, due to the interaction between the gas and the liquid phase, the flow is complicated. Slug flow study is most difficult. In order to study the characteristics of slug leak, the difference between single-phase pipeline and mixed pipeline leak dynamic pressure is studied, leakage process is simulated based on dynamic mesh and UDF, pressure, velocity and turbulent intensity are analyzed, then the flow field characteristic of slug leakage is obtained. The results show that, compared with the single-phase pipeline, when the leakage direction is the upper and middle parts, the leakage of the slug flow in the mixed pipeline forms an obvious downward dynamic pressure wave pulse, and the sustain leakage alternately appears multiple upward and downward signal pulses, and the amplitude of the signal is much larger than that of the normal flow signal. The downward dynamic pressure pulse generated at the moment of leakage is caused by the sudden drop of pressure. The pressure change caused by the moment of leakage is mainly reflected in the pipeline pressure. The dynamic pressure sensor installed through the pipeline can effectively reflect the pressure change generated at the moment of leakage. The arrival and departure positions of the liquid plug are the main factors affecting the pressure fluctuation of the pipeline. The combination of dynamic mesh simulation and experiment can be used to study the flow field characteristics of slug flow leakage in gas-liquid mixed pipeline.

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Gas-liquid mixed Pipeline / slug flow leakage / flow field characteristics

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FANG Liping1,2,LI Yuxing2,LIANG Jinlu1,ZHOU Xiong1. Flow field characteristics for slug leakage in a gas-liquid mixed pipeline[J]. Journal of Vibration and Shock, 2024, 43(12): 194-202

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