Vortex-induced vibration suppression for an inclined flexible straked cylinder at large inclination angle

被引：0
|
作者：
Xu W.-H. [1 ]
Luan Y.-S. [1 ]
Yu Y. [1 ]
Qin W.-Q. [1 ]
机构：
[1] State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin
来源：
Xu, Wan-Hai (xuwanhai@tju.edu.cn) | 2018年 / Tsinghua University卷 / 35期
关键词：
Helical strakes; Inclination angle; Inclined cylinder; Independence principle; Vortex-induced vibration;
D O I：
10.6052/j.issn.1000-4750.2016.09.0719
中图分类号：
学科分类号：
摘要：
A series of tests on vortex-induced vibration (VIV) suppression for an inclined flexible straked cylinder with a high aspect ratio (L/D=350), low mass ratio (m*=1.90) and large inclination angle (a=45°), were conducted in a towing tank. The effect of helical strakes with a pitch of 17.5D and a height of 0.25D on the VIV reduction of an inclined cylinder was investigated and discussed. The dynamic response features of an inclined straked cylinder undergoing VIV were studied. The uniform flow was generated by towing the cylinder model in still water along the tank from 0.05 m/s to 1.0 m/s with an interval of 0.05 m/s, the corresponding Reynolds number ranged from 800 to 16000. The strain signals in cross-flow (CF) and in-line (IL) directions were measured using strain gauges. The response displacement was obtained by a modal analysis approach. The experimental results indicated that the strain and displacement suppression efficiency of the inclined cylinder attached with helical strakes are not as well as that of a vertical straked cylinder. Moreover, the inclined flexible cylinder fitted with helical strakes exhibits regular CF and IL multi-modal VIV. The independence principle (IP) seems to be an unreasonable hypothesis for predicting VIV of an inclined flexible straked cylinder with large inclination angle. © 2018, Engineering Mechanics Press. All right reserved.
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页码：236 / 245
页数：9
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共 33 条
  • [1] Chaplin J.R., Bearman P.W., Huera-Huarte F.J., Et al., Laboratory measurements of vortex-induced vibrations of a vertical tension riser in a stepped current, Journal of Fluids and Structures, 21, 1, pp. 3-24, (2005)
  • [2] Trim A.D., Braaten H., Lie H., Et al., Experimental investigation of vortex-induced vibration of long marine risers, Journal of Fluids and Structures, 21, 3, pp. 335-361, (2005)
  • [3] Lie H., Kaasen K.E., Modal analysis of measurements from a large-scale VIV model test of a riser in linearly sheared flow, Journal of Fluids and Structures, 22, 4, pp. 557-575, (2006)
  • [4] Xu J., He M., Bose N., Vortex modes and vortex-induced vibration of a long, flexible riser, Ocean Engineering, 36, 6, pp. 456-467, (2009)
  • [5] Huera-Huarte F.J., Bearman P.W., Wake structures and vortex-induced vibrations of a long flexible cylinder-part 1: dynamic response, Journal of Fluids and Structures, 25, 6, pp. 969-990, (2009)
  • [6] Huera-Huarte F.J., Bearman P.W., Wake structures and vortex-induced vibrations of a long flexible cylinder-part2: drag coefficients and vortex modes, Journal of Fluids and Structures, 25, 6, pp. 991-1006, (2009)
  • [7] Lee L., Allen D., Vibration frequency and lock-in bandwidth of tensioned, flexible cylinders experiencing vortex shedding, Journal of Fluids and Structures, 26, 4, pp. 602-610, (2010)
  • [8] Modarres-Sadeghi Y., Mukundan H., Dahl J.M., Et al., The effect of higher harmonic forces on fatigue life of marine risers, Journal of Sound and Vibration, 329, 1, pp. 43-55, (2010)
  • [9] Song J., Lu L., Teng B., Et al., Laboratory tests of vortex-induced vibrations of a long flexible riser pipe subjected to uniform flow, Ocean Engineering, 38, 11, pp. 1308-1322, (2011)
  • [10] Wu X., Ge F., Hong Y., A review of recent studies on vortex-induced vibrations of long slender cylinders, Journal of Fluids and Structures, 28, 1, pp. 292-308, (2012)
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