浮式平台运动对叶片变形及整机性能影响

Impact of the floating platform motion on blade deformation and performance of wind turbine

浮式平台在海洋环境中发生六自由度运动使得叶片周围流场产生剧烈波动,剧烈变化的流场会对叶片动态响应造成巨大的影响。采用CFD-CSD耦合方法对NREL 5 MW风力机进行了双向流固耦合仿真,在此基础上利用UDF技术加入浮式平台运动,研究了平台纵荡、纵摇和艏摇运动下叶片变形情况及整机扭矩和推力变化。研究结果表明:纵荡、纵摇和艏摇这3种典型平台运动会使得叶片变形幅度增大,挥舞和扭转变形增幅要大于摆振变形;纵荡运动对叶片变形及气动性能的影响最大,扭转变形最大变化幅度可达70%,整机扭矩和推力的峰值分别提高了30.51%和11.75%;纵摇和艏摇运动减小了平均扭矩和推力。

The floating platform undergoes six degrees-of-freedom of motion in the marine environment,making the flow field around the blade fluctuate drastically,and the changing flow field will have a huge impact on the dynamic response of the blade.A two-way fluid-structure interaction simulation of the NREL 5 MW wind turbine was carried out using the CFD-CSD coupling method.Based on this,the UDF technique introduced the floating platform motion to study the blade deformation and the overall torque and thrust changes under the surge,pitch,and yaw motion.The results show that the three typical platform motions of the surge,pitch,and yaw make the blade deformation amplitude increase,and the increase of flapwise and torsional deformation is more significant than that of edgewise deformation;the surge motion has the greatest influence on the blade deformation and aerodynamic performance,the maximum change range of torsional deformation can reach 70%,the peak values of the torque and thrust are increased by 30.51%and 11.75%respectively;the pitch and yaw motions reduce the average torque and thrust.