阻流器对海底管道自埋效果的数值模拟分析

在杭州湾海底管道的埋设中应用自埋技术,取得了防止产生管跨和增加管道的稳定性的理想效果。鉴于此,介绍了海底管道埋设的自埋原理;用数值模拟的方法分析了有无阻流器2种情况下海水对管道冲刷产生的不同影响。通过对比发现,有阻流器的管道表面的压力系数在阻流器的两侧产生剧烈变化,沿水流方向由正值变为负值;升力系数变为负值;管道与海床间隙中水流的速度增大,从而使海床受到海水的剪应力也相应增大,海床易于受冲蚀,有利于实现海底管道自埋。

Effect of spoiler on self-burial behavior of submarine pipeline by numerical simulation analysis

The self-burial technology is applied to avoid spans of submarine pipelines and improve the stability of pipelines as submarine pipelines are laid in Hangzhou Bay. The self-burial principle of submarine pipelines is introduced. The differentinfluences of seawater scouring on pipelines under the conditions of having spoiler and having no spoiler are analyzed by means of numerical simulation. It is discovered by contrast that the pressure coefficient of pipeline surface with spoiler changes dramatically along the two sides of spoiler from positive to negative alongside the water stream; the lift coefficient becomes negative; with the increasing velocity of stream between pipeline and seabed, the shear stress on the seabed enhances, so seabed is prone to eroding and the self-burial of submarine pipeline can be realized easily.