Influences of the helical strake cross-section shape on vortex-induced vibrations suppression for a long flexible cylinder
Autor: | Liqin Liu, Wanhai Xu, Yingxiang Wu, Ying-sen Luan |
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Rok vydání: | 2017 |
Předmět: |
Drag coefficient
Materials science 020101 civil engineering Ocean Engineering 02 engineering and technology Oceanography 01 natural sciences 010305 fluids & plasmas 0201 civil engineering Cylinder (engine) law.invention symbols.namesake Cross section (physics) law 0103 physical sciences Strain gauge Renewable Energy Sustainability and the Environment business.industry Mechanical Engineering Reynolds number Particle displacement Mechanics Structural engineering Strake Vibration symbols business |
Zdroj: | China Ocean Engineering. 31:438-446 |
ISSN: | 2191-8945 0890-5487 |
Popis: | 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 roundsectioned 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 squaresection. |
Databáze: | OpenAIRE |
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