OC4浮式风力机基础压载水晃荡特性数值研究  

Numerical Simulation of Ballast Water Sloshing inside OC4 Floating Offshore Wind Turbine

作　　者：张任捷 毛其然 刘远传 ZHANG Renjie;MAO Qiran;LIU Yuanchuan(College of Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学工程学院,青岛266100

出　　处：《中国造船》2024年第1期202-212,共11页Shipbuilding of China

基　　金：工信部高性能船舶科研资助项目(2019 [360]);国家自然科学基金项目(52371297)。

摘　　要：受到波浪影响,浮式风力机会作6自由度运动,浮式基础内压载水会随之晃荡,进而影响风力机的正常运行。基于开源CFD软件OpenFOAM对OC4浮式风力机基础压载水晃荡进行数值模拟并研究其动力特性,基于指定频率和幅值的强迫激励分析激励频率和基础尺寸对压载水晃荡特性的影响,分析自由液面高程变化和晃荡载荷等参数随激励频率变化的规律。结果表明:晃荡力和波高都在风力机固有周期附近达到最大,并随着激励周期与固有周期偏离的增大而减小;不同立柱间的上柱晃荡力差异主要由压载水速度分量的不同引起,而下柱晃荡力差异主要由压载水流通形成的压载水体积变化引起。减小上柱直径,导致液面面积减小,立柱内压载水的速度分量减小,从而影响晃荡力。A floating offshore wind turbine(FOWT)can experience considerable six-degree-of-freedom motions due to waves and wind forces,thus exciting sloshing of ballast water inside the floating foundation,which may disrupt its normal operation.In this paper,sloshing inside the widely known OC4 DeepCwind semi-submersible FOWT subjected to prescribed sinusoidal excitations is investigated numerically using an open-source toolbox of computational fluid dynamics OpenFOAM.Excitation parameters are varied and a series of motion frequencies is simulated.The sloshing performance is analyzed by reducing the diameter of the upper column while keeping the base column unchanged.Results indicate that the maximum sloshing force and surface elevation occur near the natural period of the floating structure.Discrepancies in sloshing forces between adjacent columns are caused mainly by the differences in velocity components,while the sloshing force of the base column is primarily affected by the change in ballast water volume.Additionally,reducing the upper column's diameter can decrease the response of the sloshing force due to the reduction of the velocity component with the increase of ballast water depth.

关 键 词：浮式风力机 压载水 晃荡荷载 强迫振荡 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]