水平軸風車上流の誘導速度場およびこれに伴う乱流構造の変形に関する研究

抄録

Velocity field induced by the wake vortices of the rotor blades definitely deforms the turbulent structure of the incoming wind into the rotor, although the conventional turbulent models usually introduce the time series of velocity fluctuation on the rotor plane directly using the spectrum and the coherence functions for the atmospheric turbulence, as the input for the models. The present study aims to clarify the effects of velocity field induced by the turbine on the turbulent structure of the flow incoming into the rotor, by numerical analysis. The induced velocity field and its spatial gradient in the upstream region of the rotor have been calculated by using the model based on the asymptotic acceleration potential theory, which can deduces the time scales of the induced velocity field. The calculation model can also research the frequency characteristics of the velocity fluctuations, which are experienced by the rotor rotating in the turbulent field. It has been found that, the time scales and frequency characteristics of the flows substantially vary in the rotational and radial directions, and are different from those of the atmospheric turbulence.