| 基于图像处理的异重流与系泊结构物作用模型试验研究 |
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| 引用本文： | 陈欣桐,李欣,胡智焕,吴骁.基于图像处理的异重流与系泊结构物作用模型试验研究[J].海洋工程,2020,38(5):50-60. |
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| 作者姓名： | 陈欣桐 李欣 胡智焕 吴骁 |
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| 作者单位： | 上海交通大学 海洋工程国家重点实验室, 上海 200240;高新船舶与深海开发装备协同创新中心, 上海 200240 |
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| 基金项目： | 国家自然科学基金资助项目（51779141） |
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| 摘 要： | 异重流广泛存在于江河入海口附近，速度快、破坏力强，给近海工程的施工作业带来不小的难度。为了研究系泊结构物在异重流作用下的运动响应，基于图像处理技术，采用开闸式异重流模型试验方法，将异重流和结构物作为研究对象。利用图像处理技术处理由高速摄像机拍摄的结构物运动图片，从而获得结构物运动的时历曲线。对比讨论了不同密度比的异重流对结构物运动的影响，同一密度比的异重流对处于不同深度结构物运动的影响。研究结果表明：结构物运动受异重流密度的影响较大，结构物的运动幅值随着密度的增大而增大。处于高密度流体非混合层的结构物受到异重流的作用会产生大幅度的顺时针旋转和正x方向偏移；位置较高的方柱受到淡水的主导作用，会产生逆时针旋转和负x方向偏移。位于盐水与淡水剧烈混合区域的方柱并不会产生单一方向的偏移，而是在平衡位置附近波动。
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| 关 键 词： | 异重流 开闸试验 图像处理 运动响应 |
| 收稿时间： | 2019/7/18 0:00:00 |
Experimental research on gravity current around a mooring cylinder based on image processing |
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| CHEN Xintong,LI Xin,HU Zhihuan,WU Xiao.Experimental research on gravity current around a mooring cylinder based on image processing[J].Ocean Engineering,2020,38(5):50-60. |
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| Authors: | CHEN Xintong LI Xin HU Zhihuan WU Xiao |
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| Institution: | State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China |
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| Abstract: | The gravity current is widely distributed near the estuary of a river, and it has a high speed and strong destructive power, which has a significant impact on the construction work of offshore projects. In order to study the motion response of the mooring cylinder under the action of gravity current, based on the image processing technology,the lock-exchange gravity current model test method is adopted, and the gravity current and the square cylinder are taken as research objects. The image processing method is used to process the picture of the structure taken by the high-speed camera, so as to obtain the time-history curve of the structure movement. The effects of different density ratios on the motion responses of the cylinder are discussed, and the effects of different depths of the cylinder on the motion responses of cylinder are discussed. The results show that the motion of the structure is greatly affected by the density of the gravity current, and the motion amplitude of the structure increases as the density increases. The structure in the non-mixed layer of high-density fluid will produce a large clockwise rotation and a positive x-direction deviation due to the effect of gravity current; the square column at a higher position will be dominated by fresh water and will produce a counterclockwise rotation and a negative x Direction offset. The square column located in the area where the salt water and fresh water are violently mixed does not produce a single-direction deviation, but fluctuates near the equilibrium position. |
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| Keywords: | gravity current lock-exchange experiment image processing motion response |
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