An Experimental Investigation on the Slug Flow-induced Vibration of Flexible Riser

doi:10.11885/j.issn.1674-5086.2020.10.16.02

Abstract

Abstract: Experiments on hydrodynamic slug flow-induced vibration of flexible riser at different gas superficial velocities were carried out in the air-water test loop using the non-intrusive measurement with high-speed cameras. The vibration displacements were synchronously captured with the internal flow regimes. The dynamic characteristics of flexible riser are analyzed in terms of the amplitude response, modal weight, frequency variation as well as the slug flow characteristics. The results indicate that the amplitude is amplified, and the modal interaction is enhanced with increasing the gas superficial velocity. The fundamental mode dominates the vibration response despite the growth in the modal weight of higher ones. The flow instability of short slugs mainly contributes to the response when the gas superficial velocity is relatively small. In contrast, the response is closely related to the occurrence frequency of long slugs at larger gas superficial velocities. Additionally, both the slug length and migration velocity are enlarged with increasing the gas superficial velocity, while the liquid holdup is reduced.

Key words: flexible riser, hydrodynamic slug flow, flow-induced vibration, high-speed camera, gas superficial velocity

CLC Number:

TE832

ZHU Hongjun, GAO Yue, ZHAO Honglei, HU Jie, LIU Wenli. An Experimental Investigation on the Slug Flow-induced Vibration of Flexible Riser[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(6): 1-11.

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