Wind field simulation and wind-induced responses of large wind turbine tower-blade coupled structure

摘要

Herein, by a case study on a 5-MW wind turbine system developed by Nanjing University of Aeronautics and Astronautics, the wind field simulation and wind-induced vibration characteristics of wind turbine tower-blade coupled systems is analyzed. First, the blade-nacelle-tower-basis integrated finite element model with centrifugal forces induced by rotational blades is established. Then, based on a harmony superposition method and the modified blade element-momentum theory, the fluctuating wind field of tower-blade coupled systems is simulated, which considers wind shear effect, tower shadow effect, rotational effect, blade-tower dynamic and model interaction effects. Finally, the wind-induced dynamic responses and wind vibration coefficients of the wind turbine tower-blade coupled structure are discussed through the consistent coupled method' previously proposed by us. The results indicate that the wind-induced responses of a large wind turbine tower-blade coupled structure present complicated modal responses and multimode coupling effect. Additionally, the rotational effect would amplify aerodynamic loads on blades with high frequency, wind-induced dynamic responses and wind vibration coefficients of wind turbine tower. The centrifugal force effect could also amplify natural vibration frequency of the tower-blade coupled system and reduce the wind-induced dynamic responses and wind vibration coefficients of wind turbine tower. The research could contribute to wind-resistant design of structure for a large-scale wind turbine tower-blade system. Copyright (c) 2014 John Wiley & Sons, Ltd.