Tests for vortex-induced vibration in 2-DOF risers with helical strakes

被引：0
|
作者：
Zhou Y. [1 ]
Huang W. [2 ]
Yang B. [3 ]
Pan C. [3 ]
Song Z. [3 ]
机构：
[1] School of Port and Transportation Engineering, Zhejiang Ocean University, Zhoushan
[2] Shandong Provincial Key Lab of Ocean Engineering, Ocean University of China, Qingdao
[3] Key Lab of Engineering Oceanography, Second Institute of Oceanography, State Oceanic Administration, Hangzhou
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2018年 / 37卷 / 17期
关键词：
Helical strakes; Reynolds number; Riser; Strouhal number; Vortex-induced vibration (VIV);
D O I：
10.13465/j.cnki.jvs.2018.17.035
中图分类号：
学科分类号：
摘要：
In order to study suppression effect of helical strakes on risers' VIV, model test method was used to conduct tests for VIV of 2-DOF risers including one bare riser and 3 risers with helical strakes of different pitches under different Reynolds numbers in a water channel. VIV differences among the bare riser and 3 risers with helical strakes were analyzed, and the effects of different helical pitches on risers' VIV were studied. Moreover, wake flows of these 4 risers during their VIV were observed with the tracer method. The results showed that helical strakes can disturb risers wake flows' vortex discharge to effectively suppress risers vibration responses in their transverse flow direction; compared to the bare riser, vibration responses in transverse flow direction of risers with helical strakes can be reduced by 70 percent, but their in-line vibration responses increase; the helical strake with a 9D pitch has the best suppressing effect on risers' VIV; Strouhal number of the bare riser is larger than those of risers with helical strakes under different Reynolds numbers. © 2018, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：249 / 255
页数：6
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