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Investigation on the periodically oscillating pressure characteristics of the flow in the rolling pipe

机译：轧制管内流动的周期性振荡压力特性研究

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摘要

The floating LNG plants are gaining recently increasing attention in offshore energy exploitation. The effects of periodically oscillatory motion on the fluid flow in all processes on the offshore plant are very complicated and required detailed thermodynamic and hydrodynamic analyses. In this paper, numerical simulations are conducted by CFD code combined with user-defined functions (UDF). The computational model of the circular pipe flow is established with the excitation rolling motion, at the.excitation frequencies of 1-4 rad/s and the excitation angles of 3-15 degree, respectively. The influences of the flow velocities and excitation conditions on the pressure characteristics, including the time-average pressure, the amplitude and the period of pressure fluctuation are systematically investigated. It is found that the pressure fluctuation of the in-viscid flow keeps almost constant at different flow velocities. The amplitude of the pressure fluctuation increases with the increase of the excitation angle. Meanwhile, with the increase of the excitation frequency, the amplitude decreases in the vertical pipe, but increases in the horizontal pipe. It is also found that the period of the pressure fluctuation is depended on the excitation frequency. Furthermore, the theoretical analyses for the flow in the rolling circular pipe are conducted, which qualitatively agree with the numerical simulations.
机译：浮动式液化天然气工厂最近在海上能源开发中越来越受到关注。在海上工厂的所有过程中，周期性振荡运动对流体流动的影响非常复杂，需要详细的热力学和流体力学分析。在本文中，通过CFD代码结合用户定义函数（UDF）进行了数值模拟。通过激励滚动运动，分别在1-4 rad / s的激励频率和3-15度的激励角下建立圆形管道流动的计算模型。系统地研究了流速和激励条件对压力特性的影响，包括时间平均压力，压力波动幅度和周期。发现在不同的流速下，粘性流体的压力波动几乎保持恒定。压力波动的幅度随着激励角的增加而增加。同时，随着激励频率的增加，垂直管的振幅减小，而水平管的振幅增大。还发现压力波动的周期取决于激励频率。此外，对轧制圆管中的流动进行了理论分析，定性地与数值模拟吻合。

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  • 来源
    《Ocean Engineering》 |2012年第12期|p.1-9|共9页
  • 作者

    Yan Gu; Yonglin Ju;

  • 作者单位

    Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;

    Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    pressure; fluctuation; rolling; LNC-FPSO; offshore;

    机译：压力;波动;滚动LNC-FPSO;离岸的;

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