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 fluid-structure 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 fluid-structure 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.