单柱式浮式风力机动力响应数值与试验分析

Dynamic Response Numerical and Test Analysis of Spar Floating Wind Turbine

以200 m作业水深的5 MW OC3单柱式浮式风力机为研究对象,采用FAST程序对其在不同海况下的运动进行全耦合时历数值计算,并与采用1∶50缩尺比模型试验所得时历结果进行对比,通过时域以及频域方法对平台主要自由度运动以及系泊拉力进行分析。研究发现:垂向运动带来的自由面记忆效应较纵向和横向小;悬链线式模型所能提供的系泊拉力较张紧式系泊提供的拉力小;风浪联合作用下,风载荷主要激励低频固有频率运动,波浪载荷则主要激励波频运动;平台纵荡和纵摇运动受系泊系统的影响较大,而垂荡运动则不受系泊系统的影响。

A 5 MW OC3 spar-type floating wind turbine which is designed for a water depth of 200 m is analyzed by numerical calculation and model test. Dynamic response of the spar floating wind turbine in different sea states is calculated by FAST code which is coupled numerical calculation in time domain. Compared with the results of a 1∶50 scale model test, the response of main freedom degrees and the mooring tense are analyzed. The results indicate that the memory effect of free surface in vertical is weaker than longitudinal direction and transverse. The mooring tense supplied by catenary is smaller than taut. In wind-wave conditions, low frequency oscillation is induced mainly by wind load and wave oscillation is induced mainly by wave load. The mooring system has a clear influence on surge and pitch; however, it nearly has no influence on heave.