干涉对海洋立管涡激振动影响实验研究 |
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引用本文: | 李朋,郭海燕,李效民,张永波. 干涉对海洋立管涡激振动影响实验研究[J]. 船舶力学, 2015, 0(10): 1227-1234. DOI: 10.3969/j.issn.1007-7294.2015.10.007 |
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作者姓名: | 李朋 郭海燕 李效民 张永波 |
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作者单位: | 中国海洋大学 工程学院,山东 青岛,266071 |
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基金项目: | 国家高技术研究发展计划项目,国家自然科学基金重点项目 |
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摘 要: | 文章进行了干涉对海洋立管涡激振动影响的实验研究,实验分为立管前后排列和并肩排列两部分。立管间距为3~10倍直径,模型材料采用有机玻璃,长1.5 m,外径18 mm,壁厚2 mm,边界条件均为铰接,外流速分别从0.3~0.8 m/s,每级增加0.1 m/s。通过在立管表面粘贴应变计获得动态应变数据,分别从立管的横向动态响应、振幅、频率等方面对前后排列、并肩排列立管以及和单独立管的实验数据进行对比研究。结果表明,当有外流通过时,立管会受到其他立管尾流的影响,漩涡脱落引起的振动由于间距及排列方式的不同而显著不同,使得立管的动力特性、动力响应以及漩涡的脱落形式同单个立管相比均有较大的变化。
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关 键 词: | 海洋立管 涡激振动 干涉 前后排列 并肩排列 |
Experimental investigation of vortex-induced vibration of marine risers with interference |
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Abstract: | This paper presents experimental investigation concerning vortex-induced vibration of marine risers with interference. The arrangements of the risers involve tandem and side-by-side. Centre-to-centre distances from 3 to 10 diameters were studied. Model materials were made of plexiglass, with external di-ameters of 18 mm, wall thickness 2 mm and a total length of 1.5 m. Both risers are able to vibrate in the in-line and cross-flow direction through universal joints, the current velocity was varied from 0.3 m/s to 0.8 m/s, in increments of 0.1 m/s. Dynamic strain records were obtained through the dynamic strain gauges which were stick on the surface of the risers. The experimental data were contrastive studied by dynamic response of cross-flow direction, amplitude and frequency, respectively. The experimental results indicate that when the riser is in the wake of another, the oscillations induced by the vortex shedding are consider-ably modified and strongly depend on the distance of the two cylinders. Compared with the single riser, dy-namic characteristics, dynamic response and the form of vortex shedding are considerably modified. |
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Keywords: | marine risers vortex-induced vibration interference tandem arrangement side-by-side arrangement |
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