Study on Fluid-structure Interaction Characteristic for Large Scaled Wind Turbine Blade
With the increasing of large-scaled wind turbines blade size,its flexibility is also growing up.It will be more prone to lead to larger structural deformation phenomena in the operation,nonlinear aeroelastic response,and different power performance and instability problems.To predict the nonlinear aeroelastic responses of large wind turbine,it makes sense to develop a new fluid-structure interaction model.A new fluid-structure interaction model including a nonlinear beam based on the geometrically exactly beam theory and an unsteady aerodynamic model based on vortex flow wake theory is applied to study Fluid-Structure Interaction characteristics of large size blade.For the effects of the flexible blade,weight-reduction techniques and increased size.Respectively,using the method that reduce the blade stiffness and reduce the quality.The effects of the large deformation and light weight on the coupling response were studied.The results show that the reduction of the stiffness will greatly increase the deformation and load of the blade,but the effect of the quality reduction on the blade deformation and load is not obvious.When the stiffness and quality are reduced at the same time,the deformation of the blade which is outside of the impeller plane will substantial increase,resulting in impeller power decrease.The influence of the size of rotor is also studied.And the results show the increased root stress and larger fluctuate of coupled response.
wind turbinesnonlinear aeroelasticgeometrically exactly beamvortex flow wake
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