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内孤立波对小直径直立桩柱作用力的实验研究
孟静1,2, 王树亚3, 陈旭1,3, 牟海迪3
1.中国海洋大学海洋与大气学院 青岛 266100;2.中国海洋大学海洋学实验教学示范中心 青岛 266100;3.中国海洋大学物理海洋教育部重点实验室 青岛 266100
摘要:
内孤立波具有较大的振幅与较强的垂向剪切,能对海洋工程设施产生极大的破坏作用。本文设计实验研究了内孤立波与直立小直径桩柱的相互作用,采用粒子图像速度测量法(PIV)测量内孤立波的流速场,并采用自行设计的测力天平测量桩柱受力,测量分析了内孤立波对小直径直立桩柱产生作用力的实验值,与Morison公式计算的理论值比较。实验结果表明,第一模态内孤立波的流速方向以及作用力在桩柱的上下部分方向相反,产生很强的速度切变和扭力,对小直径直立桩柱造成破坏。通过与Morison公式计算的理论值比较,发现实验值与理论值的大小以及分布规律基本相同。
关键词:  内孤立波  小直径直立桩柱  粒子图像测速技术  Morison公式
DOI:10.11693/hyhz20171200317
分类号:P731.24
基金项目:国家自然科学基金项目,J1310013号,41476001号。
AN EXPERIMENTAL STUDY ON THE FORCE OF INTERNAL SOLITARY WAVE ON A CYLINDER OF SMALL DIAMETER
MENG Jing1,2, WANG Shu-Ya3, CHEN Xu1,3, MU Hai-Di3
1.College of Oceanic and Atmospheric Science, Ocean University of China, Qingdao 266100, China;2.National Oceanography Experimental Teaching Demonstration Center, Ocean University of China, Qingdao 266100, China;3.Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao 266100, China
Abstract:
Internal solitary waves inlarge amplitude with strong vertical shear can cause a great damage to marine engineering facilities. An experiment was performed to investigate the forces induced by internal solitary waves on a small-diameter cylinder. Particle Image Velocimetry (PIV) system was used to measure the velocity field of internal solitary waves and a scale was applied to measure the forces on the cylinder directly. In addition, the wave-induced force was also calculated by Morison formula with the velocity field measured by the PIV system. The experimental results show that the direction of velocity and the force of the mode-1 internal solitary wave was opposite in theupper and lower layers. Moreover, the magnitude of the force in the upper layer is higher than that in the lower layer. The strong vertical shear and torsion can cause great damage to the cylinder. Moreover, the values of the forces calculated by Morison Equation and measured in the experiment are generally equal.
Key words:  internal solitary waves  small-diameter cylinder  Particle image velocimetry  Morison formula
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