337 水平軸風車タービンロータ空力負荷に及ぼすガストの影響(S36-1 自然の流体エネルギー利用技術(1),S36 自然の流体エネルギー利用技術)  [in Japanese] 337 Aerodynamic Loads on Horizontal Axis Wind Turbine Rotors Exerted by Wind Gust  [in Japanese]

Horizontal-Axis Wind Turbines (HAWT) are installed under the natural wind conditions, so they can suffer from the complicated aerodynamic loads on the rotor blades due to the wind gust. This paper describes a numerical method and results for such conditions. The wind gust inflow is simulated by IEC model, which is composed of the sine function. An inviscid aerodynamic model based on the asymptotic acceleration potential method is adopted in the load calculation. We have calculated using unsteady and quasi-steady model, and brought out unsteady effect by comparing the results. It was found that the aerodynamic loads obtained from unsteady calculation are lower than that from quasi- steady calculation near the peak of the wind speed due to inertia effects of the wake flow.