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海底管道悬跨段在复杂的波流作用下,极易因涡激振动而引起管道的损坏甚至破坏。为了避免悬跨管道涡激振动的产生,对影响涡激振动的各种因素进行研究很有必要。以海底管道悬跨段为研究对象,采用流固耦合计算方法研究了外流速度、悬跨长度、管道壁厚以及内流等因素对管道振动特性的影响。结果表明,约化速度满足3.26≤Ur≤8的条件时,管道系统产生明显的锁定现象,能够观察到较大的管道横向位移;随着管跨长度的增大,管道的无量纲振幅增大;随着管道壁厚的增大,管道涡激振动的频率基本不变,振幅逐渐减小;空管道的约化速度约为6.517时其振幅最大,而当管道内有流体存在时,约化速度约为7.966时其振幅最大;输流管道的涡激振动振幅小于空管道的振动振幅。
Under the action of complex wave-flow, the subsea pipe cantilever section is easily damaged or vandalized by vortex-induced vibration. In order to avoid the vortex-induced vibration of the suspended pipelines, it is necessary to study the various factors that affect the vortex-induced vibration. Taking the subsea section of submarine pipeline as the research object, the influences of the flow velocity, length of suspension span, pipe wall thickness and inflow on the vibration characteristics of the pipeline were studied by means of fluid-solid coupling calculation. The results show that when the reduction speed satisfies the condition of 3.26≤Ur≤8, the pipeline system has obvious locking phenomenon and large lateral displacement of pipeline can be observed. As the length of pipe span increases, the dimensionless amplitude of pipeline increases ; With the increase of pipe wall thickness, the frequency of vortex-induced vibration of pipe is basically the same, and the amplitude of pipe vibration decreases gradually. The amplitude of vortex-induced vibration of pipe is the largest when the derated velocity of pipe is about 6.517, When the velocity is about 7.966, the amplitude is the largest. The amplitude of the vortex-induced vibration in the transmission pipe is smaller than the vibration amplitude of the empty pipe.