风波耦合作用下垂荡板对漂浮式风力机Spar平台动态响应影响

Effects of Heave Plate on Dynamic Response of Floating Wind Turbine Spar Platform Under the Coupling Effects of Wind and Wave

建立基于OC3-Hywind Spar Buoy平台的NREL 5MW漂浮式风力机整机模型,提出漂浮式风力机Spar平台主体附加垂荡板的结构设计方法,基于叶素动量理论通过Fortran编程实现AQWA的二次开发,基于辐射/绕射理论对比研究了垂荡板及其安装位置对漂浮式风力机Spar平台动态响应特性的影响。结果表明:频域分析中,垂荡板对纵荡RAO影响较小,减小了垂荡RAO,但增大了纵摇RAO。时域分析中,风波耦合作用下垂荡板增大了平台纵荡响应,但安装位置对纵荡响应影响较小;垂荡板位于中部和底部时对平台垂荡响应的抑制效果最明显,位于上部时抑制效果不明显;垂荡板位于中部和底部时对纵摇响应抑制效果最明显,位于上部时增大了平台的纵摇响应;垂荡板位于中部和底部时明显提高其稳定性,位于上部时加剧了机舱纵荡加速度;垂荡板显著降低了系泊张力,但安装位置对系泊张力影响较小。

The whole model of floating wind turbine was established based on the OC3-Hywind Spar Buoy platform and the NREL 5 MW wind turbine. This work proposed the structural design method of equipping the heave plate on the main body of the platform. Based on the bladed element momentum, the Fortran language was adopted to accomplish the secondary development of hydrodynamic software AQWA,and the radiation/diffraction theory was employed to do the comparative study of heave plate and its equipping position on the dynamic response of floating wind turbine Spar platform.Some interesting phenomena were found as follows. The heave plate can hardly affect the Surge RAO with a significant inhibition effect on the Heave RAO, while aggravating the pitch RAO in frequency domain analysis. In the time-domain analysis, surge movement of the platform increases significantly when considering the coupling effects of wind and wave and the effects of mooring line system. What’s more, the heave movement of the platform is sensitive to the heave plate and its equip position. As to pitch movement, heave plate inhibits its response to some extent, but exacerbates its response when equipped on the upper part of the platform which is contrary to the bottom and middle equip cases. For surge vibration acceleration of the nacelle, heave plate can significantly improve its stability when equipped on the upper part of the platform. At last, cable force of the mooring line system is reduced distinctly but not sensitive to the equip position of the platform.