Dynamic stability of a submerged, free-hanging riser conveying fluid
Dynamic stability of a submerged, free-hanging riser conveying fluid
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DOI：
10.1016/j.jsv.2004.09.024
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发表时间：
2005-02
影响因子：
4.7
通讯作者：
G. Kuiper;A. Metrikine
中科院分区：
文献类型：
--
作者：
G. Kuiper;A. Metrikine
研究人员在研究垂直悬挂的、完全浸没的输水管（水立管）的稳定性时，发现理论预测与实验之间存在矛盾。理论预测在小对流速度下的不稳定性，而实验没有显示这种不稳定性。唯一试图解释这一矛盾的是帕杜西斯，他认为理论预测是错误的，因为对管道入口处水的负压的描述不正确。本文从理论上证明了负压对稳定性的影响很小，不能解释这种矛盾。可以解释它的是由周围的水引起的水动力阻力，这被证明是一个重要的稳定因素。
Studying the stability of a vertically suspended, fully submerged pipe conveying water (water riser), researchers have found a contradiction between theoretical predictions and experiments. Theory predicts instability at small velocities of convection, while experiments did not show such instability. The only attempt to explain this contradiction was made by Paı¨doussis, suggesting that the theoretical prediction is wrong because of an improper description of the negative pressurisation of water at the inlet of the pipe. In this paper, it is shown theoretically that the negative pressurisation influences the stability only slightly and cannot explain the contradiction. What can explain it, is the hydrodynamic drag caused by surrounding water, which is shown to be an essential stabilising factor.