不同浸没深度下水平圆柱体的水动力特性试验研究

发布时间：2018-05-19 18:29

本文选题：水平圆柱 + 不同浸没深度　；参考：《船舶力学》2017年10期

【摘要】：顺应式的漂浮柔性圆柱型结构物,如深海养殖结构物的浮圈结构、波浪能发电装置的浮体部分等,大多是部分浸没的。目前,学术界和工程界对部分浸没圆柱的水动力特性了解甚少,也使这些新型结构物在设计和分析时面临着一系列的困难。文章利用在拖曳水池中对水平圆柱进行强迫振荡的试验方法,研究了不同浸没深度的水平圆柱体在流、波浪以及波-流耦合作用下的水动力特性,获得了拖曳力系数和附加水质量系数在不同浸没深度下与Reynolds数、KC数和Vr的关系。通过研究发现:(1)在纯流作用下,由于自由液面的存在,超过半浸没的圆柱体的拖曳力系数在超临界范围内将大于全浸没圆柱;(2)在波浪作用下的半浸没圆柱的水动力系数完全不能等同于全浸没圆柱的一半来进行考虑;(3)流的存在对水动力系数的影响比较显著,会导致惯性力系数的增大。
[Abstract]:Compliant floating flexible cylindrical structures, such as the floating ring structures of deep-sea aquaculture structures and the floating body parts of wave power generation devices, are mostly partially submerged. At present, the academic and engineering circles have little understanding of the hydrodynamic characteristics of partially submerged cylinders, which make these new structures face a series of difficulties in their design and analysis. In this paper, the hydrodynamic characteristics of horizontal cylinders with different dipping depths under the interaction of current, wave and wave-current are studied by using the experimental method of forced oscillation of horizontal cylinder in towed tank. The relations between drag force coefficient and additional water mass coefficient with Reynolds number KC number and VR at different immersion depth were obtained. It is found from the study that the free liquid surface exists in pure flow. The drag force coefficient of a cylinder over the semi-submerged cylinder will be larger than that of a fully submerged cylinder in the supercritical range.) the hydrodynamic coefficient of a semi-submerged cylinder under the action of waves can not be equal to half of the fully submerged cylinder to be considered. The effect of flow on hydrodynamic coefficient is significant. This will result in an increase in the inertial force coefficient.
【作者单位】：上海交通大学海洋工程国家重点实验室;
【基金】：国家自然科学基金资助项目(51279101,51009088)
【分类号】：P731.2;P75

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