Abstract The system considered consists of a hanging cantilevered pipe, surrounded at its upper part by a concentric rigid cylindrical tube, mounted in a tank full of water. Water enters the pipe at its upper and is discharged into the tank at its free end. This generates an upwards flow in the annulus between the pipe and the rigid tube, exiting the system at its upper end. The reverse flow configuration is also considered in which water enters the tank via the annulus and is aspirated by the pipe, exiting at its upper, clamped end. The free end of the discharging pipe could be plain or fitted with an end-piece which allows straight-through axial flow or forces the fluid to exit/enter radially. The system under study may be considered to be a highly idealized version of the operation of salt-mined caverns used for storage and subsequent retrieval of liquid and gaseous hydrocarbons. The problem is studied analytically, and the derivation of the pertinent linear equations of motion of the pipe is outlined. Extensive experiments conducted in a bench-top apparatus are also presented and compared with theoretical predictions. Experimental results and theoretical predictions show flutter for the pipe discharging fluid axially. Annular flow proves to have a strong destabilizing effect on the discharging pipe. The theoretical model predicts stability for the discharging pipe with radial exit flow and this is demonstrated experimentally for light-weight end-pieces. In the reverse flow configuration, flutter is observed in the experiments, while the theory predicts static divergence for low flow velocities and flutter for higher flow velocities.

中文翻译：

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受内流和环流作用的带罩悬臂管的动力学

摘要 所考虑的系统由悬挂的悬臂管组成，其上部由同心刚性圆柱管包围，安装在装满水的水箱中。水从其上部进入管道，并从其自由端排放到水箱中。这会在管道和刚性管之间的环形空间中产生向上流动，并在其上端离开系统。还考虑了逆流配置，其中水通过环形空间进入水箱，并被管道吸入，从其上夹紧端流出。排放管的自由端可以是平的，也可以装有一个允许直通轴向流动或迫使流体径向流出/进入的端件。所研究的系统可以被认为是用于储存和随后回收液态和气态碳氢化合物的盐矿洞穴操作的高度理想化版本。对该问题进行了分析研究，并概述了相关管道运动线性方程的推导。还介绍了在台式设备中进行的大量实验，并与理论预测进行了比较。实验结果和理论预测表明轴向排放流体的管道存在颤振。事实证明，环形流对排放管有很强的不稳定作用。理论模型预测了具有径向出口流的排放管的稳定性，这在轻质末端件的实验中得到了证明。在逆流配置中，在实验中观察到颤振，