| 细长输流管内外流耦合振动特性研究 |
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| 引用本文： | 鲍健,陈正寿.细长输流管内外流耦合振动特性研究[J].海洋工程,2022,40(2):78-87. |
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| 作者姓名： | 鲍健 陈正寿 |
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| 作者单位： | 浙江海洋大学 船舶与海运学院,浙江 舟山 316022;中国海洋大学 工程学院,山东 青岛 266100,浙江海洋大学 船舶与海运学院,浙江 舟山 316022 |
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| 基金项目： | 国家自然科学基金项目(41776105)；浙江省自然科学基金项目(LY20E090003)；舟山市科技计划项目(2019C21010) |
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| 摘 要： | 管内流动会影响输流管的振动响应，目前关于输流弹性管涡激振动方面的研究较少。基于计算流体力学(CFD)方法，开展内外流对细长输流弹性管振动特性影响的研究。首先在不考虑内流的情况下将弹性管涡激振动数值预报结果与模型试验数据进行对比，验证了数值方法的可靠性。再者考虑内外流耦合作用情况下，对不同内流流速下细长输流弹性管振动位移时—空分布、顺流向最大平均偏移、振动轨迹、内部横向涡的形成与分布等进行了对比分析。结果发现，与外流流速相比，内流流速的增加虽然难以改变弹性管的主振模态，但对沿管体的振动强度影响显著。顺流向最大偏移处管体运动轨迹发生明显的变形和跳跃。在剪切外流和均匀内流对弹性管的联合作用下，沿管跨方向模态间能量转换频繁，伴随着间歇性出现或消失的沿弹性管传播的行波组分，这主要归因于复杂的双重流固耦合系统(外流—管体，内流—管体)。在内流以附加质量力、离心力和科氏力形式的激励下，弹性管内二次流现象明显。在振动过程中，内部横向涡沿管壁生成、脱落并逐渐散布于整个横截面。
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| 关 键 词： | 涡激振动 内流 流固耦合 二次流 弹性管 |
| 收稿时间： | 2021/4/20 0:00:00 |
Study on coupling vibration characteristics of slender fluid-conveying pipe subject to internal flow and external current |
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| BAO Jian,CHEN Zhengshou.Study on coupling vibration characteristics of slender fluid-conveying pipe subject to internal flow and external current[J].Ocean Engineering,2022,40(2):78-87. |
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| Authors: | BAO Jian CHEN Zhengshou |
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| Institution: | School of Naval Architecture and Maritime Transport, Zhejiang Ocean University, Zhoushan 316022, China;College of Engineering, Ocean University of China, Qingdao 266100, China |
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| Abstract: | The transportation of internal flow along pipe affects the vibration response of the flexible fluid-conveying pipes. By far, there are few studies related to the vortex-induced vibration of the fluid-conveying pipes. Based on CFD method, the study about the coupling vibration characteristics of a slender fluid-conveying pipe subject to the internal flow and external current was carried out. Firstly, only taking the effect of external current into account, the reliability of the proposed numerical method was verified through the comparisons between the numerical prediction and the model test result. Subsequently, in the cases of the flexible pipe subject to internal flow and external current, the time-space distribution of non-dimensional vibration displacement, the maximum in-line average deflection, vibration trajectory, and the formation and distribution of internal transverse vortices were compared and analyzed. It is found that the internal flow is commonly hard to change the dominant vibration modes of the flexible pipe which are attributed to the external current, but plays a critical role in determining the vibration amplitude. There are obvious deformation and jump in relation to the motion trajectories of the pipe model in the maximum in-line average deflection. Under the combined effects of the external shear current and the uniform internal flow, the energy conversion between modes along the pipe span is frequent, accompanied by intermittent traveling waves. It is mainly attributed to the dual fluid-structure interaction system (external current coupled with the pipe, internal flow coupled with the pipe). In addition, under the excitation of internal flow in the form of added mass force, centrifugal force and Coriolis force, the phenomenon of secondary flow in the flexible pipe is obvious. During the vibration process, the internal transverse vortices are generated along the pipe wall, fall off and gradually spread across the entire cross section. |
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| Keywords: | vortex-induced vibration internal flow fluid-structure interaction secondary flow flexible pipe |
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