自升式平台风载荷的空气动力学干扰研究

Study on the Aerodynamic Interference of Wind Loads on Jack-up Platforms

风载荷是自升式平台的主要控制载荷,现行规范在计算风载荷时主要采用面积投影法,不考虑空气动力学干扰的影响,结果偏于保守。以自主研发的122m(400ft)自升式平台为例,通过风洞实验得到其各风向角下的干扰因子IF。在此基础上,采用求解RANS方程的方法,结合k湍流模型对风载荷的空气动力学干扰现象进行数值模拟,所得IF值与实验结果吻合良好,揭示了这种干扰现象对自升式平台风载荷的影响。

Wind load is the primary load to be controlled for jack-up platforms; the current regulations adopt the area projection method to compute the wind loads without taking into account the influence of aerodynamic interference, which tends to be conservative. Taking the self-developed 122m （400ft） jack-up platform as the example, the interference factors IFs under various wind directions are obtained through wind tunnel experiments. Based on this, numerical simulations are also performed through solving the RANS equations by k-ε turbulent model to study the aerodynamic interference phenomenon of wind loads. The numerically obtained IFs agree well with the experimental results and the influence of aerodynamic interference of wind loads on jack-up platforms is revealed.