摘要
为研究内流作用下悬臂取水管的动力稳定性,采用流-固耦合(FSI)开展数值研究,并与文献中的试验数据进行对比,以验证模型的准确性。结果表明,当内流速度超过临界值时,管道发生以一阶模态为主的颤振失稳,呈现大振幅颤振与小振幅抖振共存的复合振动模式。位移与应变分布在自由端振幅最大,近固定端应变能更高,且响应呈周期性波动,反映系统存在非稳态能量交换。流场分析揭示,取水管入口存在强烈吸入效应,伴随显著加速与降压,压降符合Kuiper修正负压范围。涡量场显示非对称涡结构随振动同步演化,可能诱发周期性侧向激励。相较于试验,采用双向流-固耦合的数值方法可实现全场、全时流-固耦合信息同步获取,突破测点局限,揭示流动分离、涡脱落与结构振动的能量传递路径,具备机理解析、参数可调与高分辨率等优势,弥补了试验研究的缺失信息,从而为进一步深入研究流致振动提供可能。
To investigate the dynamic stability of cantilever intake pipes conveying internal flow,a bidirectional fluidstructure interaction(FSI)model was developed and validated against experimental data from literature.Results demonstrated that exceeding a critical flow velocity triggered first-mode flutter instability,characterized by hybrid vibrations combining large-amplitude flutter and small-amplitude buffeting oscillations.Displacement peaked at the free end while strain energy concentrated near the fixed end,with periodic fluctuations revealing unsteady fluidstructure energy exchange.Flow-field analysis identified intense suction at the inlet,inducing flow acceleration and pressure drop within the Kuiper-corrected negative-pressure range.Asymmetric vortex shedding synchronized with structural vibration was observed,potentially generating periodic lateral excitations.Compared to spatially sparse experimental measurements,the bidirectional FSI approach captured full-field,time-synchronous coupling data,elucidating energy transfer pathways from flow separation and vortex shedding to structural response.This methodology bridges experimental gaps through high-resolution field visualization and adjustable parameters,providing a robust foundation for advanced flow-induced vibration research.
作者
贾志超
刘明月
郭琳
JIA Zhichao;LIU Mingyue;GUO Lin(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Yazhou Bay Institute of Deepsea Science and Technology,Shanghai Jiao Tong University,Sanya 572024,Hainan,China;Zoomlion Mining Machinery(Changsha)Co.,Ltd.,Changsha 410000,Hunan,China)
出处
《海洋工程装备与技术》
2026年第1期46-57,共12页
Ocean Engineering Equipment and Technology
基金
海南省科技计划三亚崖州湾科技城自然科学基金联合项目(2021JJLH0027)。
关键词
悬臂管道
内流作用
动力响应
流-固耦合
颤振失稳
cantilever pipe
internal flow
dynamic response
fluid-structure interaction
flutter instability
