以IWA-15 MW参考风力机为对象,研究纵摇工况下叶片形变对浮式风力机载荷特性的影响。结果表明,浮台的运动会导致风力机入流的波动,进而对风力机的性能产生影响,而在考虑叶片柔性变形后风轮的功率和推力较刚性叶片而言有所下降。由于浮台的纵摇运动所导致的附加速度,无论对于刚性风轮还是柔性风轮其俯仰力矩都随相位角发生波动,这与纵荡工况有所不同。此外,在纵摇过程中浮式风力机叶片形变会发生周期性的弯曲和扭转变形,其中扭转变形会直接改变翼型截面的攻角而弯曲变形则会影响翼型截面的入流速度。此外,来流风速对风力机的载荷和叶片形变会产生显著影响,来流风速的降低会使得浮台运动所带来的速度波动的影响增加。
Abstract
The effects of blade deflections on the load characteristics of the floating wind turbine under pitch condition are studied by using the vortex wake model and the geometrically exact beam model. The results show that the inflow velocity of the wind turbine will fluctuate significantly with the pitch motion of the floating platform, so the power and thrust of the wind turbine will also be affected, and the power and thrust of the wind turbine will decrease compared with those the rigid-blade case after considering the flexible deflection of the blade. Due to the additional velocity caused by the pitch motion of the floating platform, the tilt moment of both rigid and flexible rotor fluctuate with the phase angle, which is different from that under the surge condition. In addition, the pitch motion of the platform will result in periodic bending and torsional deflections of the blade. The torsional deflections will directly change the angle of attack of the airfoil sections, while the bending deflections will affect the inflow velocity of the airfoil sections. In addition, the inflow wind velocity has significant effect on the wind turbine loads and blade deflections, and a decrease in the inflow wind velocity will increase the influence of the velocity fluctuation caused by the floating platform motion.
关键词
浮式风力机 /
气动弹性 /
柔性形变 /
自由尾迹模型 /
几何精确梁模型
Key words
floating wind turbines /
aeroelasticity /
deflection /
free vortex wake model /
geometrically exact beam theory
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基金
三峡集团15 MW 级海上风电机组关键技术研究与应用项目（202303058）
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