The transitional states of a floating wind turbine during high levels of surge
The transitional states of a floating wind turbine during high levels of surge
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DOI：
10.1016/j.renene.2022.10.034
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发表时间：
2022-10
期刊：
影响因子：
8.7
通讯作者：
R. Kyle;W. Früh
中科院分区：
文献类型：
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作者：
R. Kyle;W. Früh
随着浮动式海上风力涡轮机的部署，风力和波浪引起的平台运动对涡轮机性能和寿命的影响受到关注，需要低阶模型来开发适当的控制策略。这项工作的重点是平台浪涌作为一个主要的附加自由度。通过3D URANS CFD模拟评估NREL 5 MW涡轮机转子上的展向气动力和转子综合气动力，探索转子过渡到螺旋桨状态期间的空气动力行为。计算流体动力学的研究结果进行了比较，修改后的致动器盘（AD）的理论和2D叶片元素动量（BEM）的方法。除了螺旋桨状态，其中转子扭矩和推力都是负的，另外两个状态被观察到具有相反的扭矩和推力符号：制动状态，具有负扭矩但正推力，第二个是准风车状态，具有负推力但扭矩正。结果表明，边界元法与AD相结合，可以可靠地预测过渡到这些国家在这样高水平的平台浪涌，并提示如何支撑力平衡的时间扰动的影响。
With the deployment of floating offshore wind turbines, the effect of their wind- and wave-induced platform motion on the turbine’s performance and life is of concern and requires low-order models to develop appropriate control strategies. This work focusses on platform surge as one of the main additional degrees of freedom. The aerodynamic behaviour during the rotor’s transition into propeller state is explored by assessing the spanwise and rotor-integrated aerodynamic forces on the rotor of the NREL 5 MW turbine through a 3D URANS CFD simulation. The CFD findings are compared with a modified actuator disk (AD) theory and 2D Blade-Element Momentum (BEM) approach. In addition to propeller state, where both rotor torque and thrust are negative, two other states were observed with opposite signs of torque and thrust: a braking state, with negative torque but positive thrust, and the second a quasi-windmill state with thrust negative yet torque positive. The results demonstrate that BEM coupled with AD can reliably predict the transitions to these states during such high levels of platform surge and give hints to how the underpinning force balances are affected by temporal perturbations.