浮式风机气动推力和扭矩同时满足相似条件的模型试验方法研究

Study on the Model-test Method of Floating Offshore Wind Turbine for Achieving Both Scaled Aerodynamic Thrust and Torque

在风浪水池中基于弗劳德相似开展的浮式风机模型试验无法同时满足雷诺相似,导致模型风机难以同时满足推力和扭矩相似。基于气动推力和扭矩相似条件,应用模型叶片几何重构方法重新求解模型风机的叶轮转速和叶片桨距角,提出了一种风机气动推力和扭矩同时满足相似要求的试验方法。首先进行风洞模型试验,验证模型风机可在全风速范围内同时满足推力相似和扭矩相似要求;然后通过数值模拟验证实型和模型关于风机和浮式支撑平台之间相互作用的相似性,结果表明缩尺模型试验能较准确地预报实型系统的运动响应以及风机的气动推力和扭矩。

Model tests of floating offshore wind turbines(FOWT)are generally carried out in the wind-wave basin based on Froude scaling.The contradiction between Reynolds and Froude scaling makes it challenging to achieve both thrust and torque similarity for the model scale wind turbine.In this paper,a new model-test method for achieving both scaled aerodynamic thrust and torque is proposed.The redesign method of model scale blade is improved,and the rotor speed and pitch angle are resolved according to the thrust and torque similarity.Firstly,a wind tunnel model test was conducted to verify that the scaled thrust and torque can be achieved simultaneously for model scale wind turbine in the whole range of wind speed.Subsequently,the interaction between the wind turbine and the floating platform was simulated.Numerical results of model and full-scale FOWT demonstrate that the full-scale wave motion response as well as the thrust and torque of the wind turbine can be predicted based on the model scale results.