Abstract: Typhoon field greatly affects the stress performance of wind turbines compared with normal wind field. To solve this problem,the medium-scale numerical Weather Research and Forecast (WRF) and small-scale Computational Fluid Dynamics (CFD) are employed to make numerical simulation of the typhoon Parrot. The paper, taking the 5 MW wind turbine in a wind farm as the research object, makes comparative analysis of wind-induced response, force stability and ultimate bearing capacity of the wind turbine coupling system under the conditions of typhoon field and normal wind field with the help of ANSYS software. According to the results, compared with normal wind field, typhoon makes three-dimensional aerodynamic force distribution pattern on the surface of the wind turbine more complicated, significantly increases the structural response of the engine room-blade-tower integrated coupling system, and greatly reduces the overall buckling stability and ultimate bearing capacity of the structure. The above conclusions can provide references for force prediction of this type of wind turbines under the environment of typhoon.

    Key words: typhoon; weather research and forecast; computational fluid dynamics; wind turbine; wind-induced response