内流激发垂直悬臂管振动失稳特性实验研究

目的 研究管道内部流速和浸没深度对细长柔性悬臂管道振动特性的影响规律。方法 通过位移传感器采集管道振动位移时程，计算管道振幅、时频特性、相位变迁和振动频率，分析内流在输流过程中所激发的管道振动失稳特性。结果 随着内流流速的增加，垂直悬臂管会经历静态、前失稳和后失稳3个不同状态。管道振幅随内流流速的增加而明显增大，但振动频率只是缓慢上升。随着管道浸没深度的增加，管道振动失稳整体减弱。结论 内流流速和浸没深度均是影响管道振动失稳特性的关键因素。

Experimental Investigation of Vertical Pipe Vibration Characteristics Induced by Internal Flow

The work aims to study the effect of the internal flow velocity and the submersion depth of the pipe on the vibration behavior of slender flexible cantilevered pipe. The vibration displacement time range of the pipe was collected by displacement sensors, and the pipe amplitude, time-frequency, phase shift and vibration frequency were calculated to analyze the vibration characteristics of the pipe excited by the internal flow in the process of conveying fluid. With the increase of internal flow velocity, the pipe experienced three states:static state, pre-instability state and post-instability state. With the increase of the internal flow velocity, the amplitude of the pipe increased obviously, but the vibration frequency only increased slowly. With the increase of pipe submersion depth, the pipe vibration instability weakened in a whole. The internal flow velocity and submersion depth are the key factors affecting the vibration instability of the pipe.