Nonlinear vibration of a riser under inter-action between internal multi-phase flow and cross flow

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (23) : 15-23.

MA Tianqi1, GU Jijun2, SUN Xu2,ZHANG Yingjin2,LI Mingjie3

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Abstract

The dynamic response of a riser conveying multi-phase flow under interaction between internal flow and external cross flow was analyzed.The internal multi-phase flow-riser-external cross flow coupled dynamic equations were established,and they were solved through transforming partial differential equations into ordinary ones with the generalized integral transform technique (GITT).The results showed that the internal two-phase flow causes the riser’s natural frequencies to drop; the higher the internal flow rate and the longer the length of the riser,the more significant the internal two-phase flow’s action; under the interaction of internal flow and external cross flow,increase in gas content inside the riser makes the frequency of the riser’s vortex induced vibration decrease and the vibration amplitudes increase; internal two-phase flow causes the riser’s resonance under a lower external flow rate and induces the riser’s higher order modal vibration; the higher the external cross flow rate,the smaller the action of internal two-phase flow.

Key words

pipe-conveying multi-phase flow / vortex induced vibration / nonlinear / the generalized integral transform technique

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MA Tianqi1, GU Jijun2, SUN Xu2,ZHANG Yingjin2,LI Mingjie3. Nonlinear vibration of a riser under inter-action between internal multi-phase flow and cross flow[J]. Journal of Vibration and Shock, 2018, 37(23): 15-23

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