タンデム配置された風車の空力特性

抄録

In order to estimate influence of wake interaction on power coefficient of offshore wind farms, large-scale numerical flow simulations were conducted with LES. The biggest issues of flow simulations for offshore wind farm is to solve the high-Reynolds number turbulent flow at the order of 107 around rotational blades and multi time scale phenomena for the interaction of wake flow and turbulent boundary layer. A large-scale numerical analysis exceeding 600 million elements capable of properly analyzing the vorticial structure of the wake were conducted over a million-time steps with a grid resolution sufficient to realize the turning flow at the blade leading edge. It was found that in the case of the wind turbine is arranged at downstream of 3 times the diameter, the power coefficient of the downstream wind turbine is reduced to about 16% compared to that of the upstream wind turbine.