自升式平台弦杆水动力系数的影响因素

Influencing Factors of Hydrodynamic Coefficient of Jack-up Platform Chord

为探讨缩尺比、波流入射角以及齿条等因素对自升式海洋平台弦杆水动力系数的影响规律关系,在实验水池内搭建波流载荷模拟实验平台,模拟不同流速、波高和周期组合下的波流载荷,开展单弦杆水动力实验。利用应变传感器和六维力传感器进行全信息数据采集;基于莫里森方程对实验数据进行处理分析得到不同实验工况下的水动力系数及影响规律关系;采用回归方法建立水动力系数与缩尺比、入水角度以及齿条之间的回归方程。结果表明,缩尺比对拖曳力系数和惯性力系数的影响较大,波流入射角和齿条对拖曳力系数的影响较大而对惯性力系数的影响较小。

In order to study the relationship between scale ratio, wave incident angle, and rack on the hydrodynamic coefficients of platforms chord, a test platform was set up in the wave tank. In the platform, the wave and current load combined with different flow velocity, wave height and period can be simulated. The data were collected by using strain transducer and six-dimensional force sensor. Based on Morison equation, hydrodynamic coefficients under different experimental conditions and the relationships with influencing factors were obtained by analyzing the experiment data. Furthermore, regression equations of hydrodynamic coefficients with the scale ratio, wave incident angle and rack were established. The results show that the scale ratio has a greater influence both on the drag force coefficients and the inertial force coefficients. The wave incident angle and the rack have a greater influence on the drag force coefficients and a less influence on the inertial force coefficients.