Study on Design and Development for High-Speed High-Efficient Off-Shore Wind Farm

为了在日本推广离岸风力发电场，存在许多技术问题，例如预测海岸附近风的潜力和不稳定性，适合高速风力涡轮机的翼型形状，本课题的研究目的是为设计和开发非稳态噪声控制系统提供基础数据，海岸风电场由三个不同大学的团队。每个团队的结果总结如下：名古屋大学团队：在野外进行了风测量，以澄清复杂地形上风流的湍流特性，并从风波动的功率谱和空间相干性评估了坡度对湍流的影响。湍流强度随着坡度的增大而增大，在高频范围内，湍流强度呈现出更高的水平。东京大学团队：使用大涡模拟和直接噪声模拟，计算了风力涡轮机叶片周围的流场和声场，并预测了实际叶尖形状的气动性能和声发射。通过风洞实验，测量了旋转和静止状态下旋翼桨叶表面的压力分布。旋转和静止条件之间的压力分布的差异在叶片的根部区域变得很大。

In order to promote off-shore wind farms in Japan, there are many technical problems such as the forecast of the potential and the unsteady nature of the wind near the coast, the shape of the aerofoils appropriate to the high speed wind turbines, the prediction of the noise and so on. This research project was carried out to obtain the fundamental data for the design and development of the off-shore wind farm by three teams of different universities. The results of each team are summarized as follows :Nagoya University Team : The wind measurements were carried out in the field to clarify the turbulence characteristics of the wind flow over a complex terrain and the effects of the slope on the turbulence was evaluated from the power spectrum and spatial coherence of the wind fluctuation. Turbulence intensity becomes larger with the increase in the slope steepness and the fluctuation exhibits higher level in the range of high frequency.Tokyo University Team : Using a large-eddy simulation and direct noise simulation, the flow and acoustic field around a wind turbine blade were calculated, and the aerodynamic performance and acoustic emission are predicted for the actual tip shape.Mie University Team : By wind tunnel study the pressure distribution on a rotor blade was measured for rotational and stationary states. The difference of the pressure distribution between the rotational and stationary conditions becomes large in the root region of the blade.