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Influences of the Helical Strake Cross-Section Shape on Vortex-Induced Vibrations Suppression for A Long Flexible Cylinder

查看参考文献31篇

文摘 An experimental study on a bare flexible cylinder as well as cylinders fitted with two types of cross-sectioned helical strakes was carried out in a towing tank. The main purpose of this paper is to investigate the effects of strakes' crosssection on the vortex-induced vibrations (VIV) suppression of a flexible cylinder. The square-sectioned and roundsectioned helical strakes were selected in the experimental tests. The uniform current was generated by towing the cylinder models along the tank using a towing carriage. The Reynolds number was in the range of 800-16000. The strain responses were measured by the strain gages in cross-flow (CF) and in-line (IL) directions. A modal analysis method was adopted to obtain the displacement responses using the strain signals in different measurement positions. The comparison of the experimental results among the bare cylinder, square-sectioned straked cylinder and round-sectioned straked cylinder was performed. The helical strakes can effectively reduce the strain amplitude, displacement amplitude, response frequencies and dominant modes of a flexible cylinder excited by VIV. And the mean drag coefficients of straked cylinders were approximately consistent with each other. In addition, the squaresectioned and round-sectioned strakes nearly share the similar VIV reduction behaviors. Sometimes, the strakes with round-section represent more excellent effects on the VIV suppression of response frequency than those with square-section.
来源 China Ocean Engineering ,2017,31(4):438-446 【核心库】
DOI 10.1007/s13344-017-0050-1
关键词 helical strakes ; VIV suppression ; cross-section shape ; flexible cylinder
地址

1. Tianjin University, State Key Laboratory of Hydraulic Engineering Simulation and Safety;;Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Tianjin, 300072  

2. Tianjin University, State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin, 300072  

3. Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190

语种 英文
文献类型 研究性论文
ISSN 0890-5487
学科 海洋学
基金 国家自然科学基金 ;  国家自然科学基金创新研究群体项目 ;  国家973计划 ;  天津市自然科学基金
文献收藏号 CSCD:6053426

参考文献 共 31 共2页

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引证文献 9 篇

1 Xu Wanhai Use of Helical Strakes for FIV Suppression of Two Inclined Flexible Cylinders in A Side-by-Side Arrangement China Ocean Engineering,2018,32(3):331-340
被引 4 次

2 Xu Wanhai Passive VIV Reduction of An Inclined Flexible Cylinder by Means of Helical Strakes with Round-Section China Ocean Engineering,2018,32(4):413-421
被引 4 次

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