低雷诺数下海底管线周围流场的数值分析  

Numerical Analysis of Flow Field around a Submarine Pipeline at a low Reynolds Number

作　　者：陈波[1] 肖祥[1] 何畏[1] 苟如意[1] 孙春梅[1] 万长成[1] 

机构地区：[1]西南石油大学机电工程学院

出　　处：《石油机械》2015年第4期77-81,共5页China Petroleum Machinery

摘　　要：正确认识和描述海底管线附近的流场变化特性,研究间隙比和海流对其作用规律对保证管线的安全运行有重要意义。引入海流速度剖面推求公式,通过公式换算出不同间隙比下海底管线中心处的海流速度,运用换算出的海流速度对海底管线附近的流场进行了数值模拟,得到接触海底管线的三涡流场图和悬空管线的流场图,并分析了海流速度和间隙比对管线升力系数及阻力系数的影响。分析结果表明,在间隙比较小时,升力系数和阻力系数迅速增大,间隙比越大、海流速度越高的海域更容易发生管线的疲劳破坏。工程实际中应根据实际海流速度和海底平整度情况适当选址,尽量避免海流速度高及海底跨度大的水域。Correctly understanding and describing the characteristics of change of the flow field near a subma- rine pipeline and studying how the gap ratio and ocean current act on it is very important for ensuring safe pipeline operation. Three-vortex flow field diagrams of a pipeline in contact with the seafloor and flow field diagrams of a dangling pipeline have been obtained, and the impacts of ocean current velocity and gap ratio on the pipelines lift coefficient and drag coefficient have been analyzed by conducting numerical simulation on the flow field near a sub- marine pipeline, using the ocean current velocity converted from the ocean current velocities at the center of the submarine pipeline under different gap ratios calculated through an ocean current velocity profile derivation formula introduced. The analysis result indicates that： when the gap ratio is small, the lift coefficient and drag coefficient increases rapidly ; the pipeline in a sea area of a larger gap ratio and a higher tidal current velocity is more prone to fatigue failure; sites should be selected properly according to actual ocean current velocities and seafloor flatness, i. e. water areas of high ocean current velocities and large submarine spans should be avoided as much as possible.

关 键 词：海底管线 海流速度 间隙比 升力系数 阻力系数 涡旋 数值模拟 

分 类 号：TE952[石油与天然气工程—石油机械设备]