Three-dimensional modeling and aeroelastic coupling analysis for the wind turbine blade

In order to study damage problems of the wind turbine blade under complicated offshore working conditions (damaging winds), the nonlinear aeroelastic analysis was achieved for the blade with flexible high aspect ratio. The three-dimensional solid model of the wind turbine blade was established and the appropriate computational domain was fixed. Finite element equations were deduced under the coupling effects between wind and the blade with the geometric nonlinearity considered. The CFD/CSD coupling numerical computational method was employed to solve the nonlinear aeroelastic problems, and then the computation flow process chart was given. The results show that the three-dimensional solid model expresses the blade spatial structure more visually and improves the precision of the numerical calculation, and that 1/3 cylinder computational domain can greatly reduce the computing resources. The establishment of aeroelastic coupling equations with structural nonlinearity provides a theoretical basis for further research on numerical simulation of aeroelastic dynamic stability for the wind turbine blade.